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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide......................................................................1
Types of Service......................................................................................................................................1
StepbyStep Configuration of a PC Acting as a PPPoE Client............................................................2
StepbyStep Configuration...................................................................................................................2
Connect the Cisco DSL Router and Your PC...................................................................................2
Start and Set Up HyperTerminal.......................................................................................................2
Clear Existing Configurations on the Cisco DSL Router..................................................................3
Configure the Cisco DSL Router......................................................................................................3
View Your Configuration..................................................................................................................4
Configuration...........................................................................................................................................4
Troubleshoot Your Configuration............................................................................................................5
RFC1483 Bridging with IRB Troubleshooting....................................................................................5
Determine the Layer to Troubleshoot......................................................................................................5
Layer 1 Issues..........................................................................................................................................6
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?....................6
Is your ISP using a DSLAM that supports the Alcatel chipset?.......................................................6
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?.................6
Is the ATM interface in an administratively down state?.................................................................6
Is the cable pinout correct?................................................................................................................6
Do you have the correct power supply for the Cisco 827?...............................................................7
Is the DSL operatingmode correct?................................................................................................7
Is the circuit tested/provisioned correctly?........................................................................................8
Layer 2 Issues..........................................................................................................................................8
Do you have the correct PVC values (VPI/VCI)?.............................................................................8
Can you ping the default gateway?...................................................................................................9
Is the bridge port in a forwarding state?..........................................................................................10
Is there an entry in the bridge table?...............................................................................................10Related Information...............................................................................................................................11
Contact the Cisco Technical Assistance Center.....................................................................................11
RFC1483 Bridging with IRB Online Form..........................................................................................12
Record Information from the ISP..........................................................................................................12
Record Information About Your Network.............................................................................................13
Choose Your Next Step.........................................................................................................................13
StepbyStep Configuration of PPPoA with a Static IP Address.........................................................13
StepbyStep Configuration.................................................................................................................14
Connect the Cisco DSL Router and Your PC.................................................................................14
Start and Set Up HyperTerminal.....................................................................................................14
Clear Existing Configurations on the Cisco DSL Router................................................................15Configure the Cisco DSL Router....................................................................................................15
View Your Configuration................................................................................................................17
Configuration.........................................................................................................................................17
Troubleshoot Your Configuration..........................................................................................................18
StepbyStep Configuration of PPPoA with a Dynamic IP Address...................................................18
StepbyStep Configuration.................................................................................................................19
Connect the Cisco DSL Router and Your PC.................................................................................19
Start and Set Up HyperTerminal.....................................................................................................19
Clear Existing Configurations on the Cisco DSL Router................................................................20
Configure the Cisco DSL Router....................................................................................................20
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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide
View Your Configuration................................................................................................................22
Configuration.........................................................................................................................................22
Troubleshoot Your Configuration..........................................................................................................23
Cisco DSL Router PPPoA with a Dynamic IP Address.....................................................................23
Tasks to Perform....................................................................................................................................24
Configuration.........................................................................................................................................24
Troubleshoot Your Configuration..........................................................................................................25
Cisco DSL Router PPPoA with a Static IP Address...........................................................................26
Tasks to Perform....................................................................................................................................26
Configuration.........................................................................................................................................26
Troubleshoot Your Configuration..........................................................................................................28
PPPoA Implementation Options............................................................................................................28
PPPoE Implementation Options for the Cisco DSL Router Acting as a PPPoE Client........................28
PPPoA Troubleshooting.....................................................................................................................29
Determine the Layer to Troubleshoot....................................................................................................29Layer 1 Issues........................................................................................................................................29
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?..................30
Is your ISP using a DSLAM that supports the Alcatel chipset?.....................................................30
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?...............30
Is the ATM interface in an administratively down state?...............................................................30
Is the cable pinout correct?..............................................................................................................30
If you are using a Cisco 827 as your DSL Customer Premises Equipment (CPE), do you have
the correct power supply for the Cisco 827?...........................................................................31
Is the DSL operatingmode correct?..............................................................................................31
Is the circuit tested/provisioned correctly?......................................................................................32
Layer 2 Issues........................................................................................................................................32Do you have the correct Permanent Virtual Circuit (PVC) values (VPI/VCI)?.............................32
Are you receiving data from your ISP?...........................................................................................33
Is PPP negotiating properly?...........................................................................................................34
How do I know if my PAP username and password are correct?...................................................37
How do I know if my CHAP username and password are correct?................................................38
How do I know when PPP authentication is successful?................................................................38
Related Information...............................................................................................................................39
Contact the Cisco Technical Assistance Center.....................................................................................39
RFC1483 Bridging Implementations.....................................................................................................40
PPPoA Online Form.............................................................................................................................40
Record Information from the ISP..........................................................................................................41Record Information About Your Network.............................................................................................41
Choose Your Next Step.........................................................................................................................41
StepbyStep Configuration of PPPoE with a Dynamic IP Address....................................................42
StepbyStep Configuration.................................................................................................................42
Connect the Cisco DSL Router and Your PC.................................................................................42
Start and Set Up HyperTerminal.....................................................................................................42
Clear Existing Configurations on the Cisco DSL Router................................................................43
Configure the Cisco DSL Router....................................................................................................43
View Your Configuration................................................................................................................45
Configuration.........................................................................................................................................46
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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide
Troubleshoot Your Configuration..........................................................................................................47
Cisco DSL Router Acting as a PPPoE Client with a Dynamic IP Address........................................47
Tasks to Perform....................................................................................................................................48
Possible Required Configuration Steps on the PC.................................................................................48
Configuration.........................................................................................................................................49
Troubleshoot Your Configuration..........................................................................................................50
Cisco DSL Router PC Acting as a PPPoE Client...............................................................................51
Tasks to Perform....................................................................................................................................51
Configuration.........................................................................................................................................51
Troubleshoot Your Configuration..........................................................................................................52
Cisco DSL Router Acting as a PPPoE Client with a Static IP Address.............................................52
Tasks to Perform....................................................................................................................................52
Possible Required Configuration Steps on the PC.................................................................................53
Configuration.........................................................................................................................................53
Troubleshoot Your Configuration..........................................................................................................55StepbyStep Configuration of PPPoE with a Static IP Address.........................................................55
StepbyStep Configuration.................................................................................................................55
Connect the Cisco DSL Router and Your PC.................................................................................55
Start and Set Up HyperTerminal.....................................................................................................56
Clear Existing Configurations on the Cisco DSL Router................................................................56
Configure the Cisco DSL Router....................................................................................................57
View Your Configuration................................................................................................................59
Configuration.........................................................................................................................................59
Troubleshoot Your Configuration..........................................................................................................60
PPPoE: DSL Router as a PPPoE Client Troubleshooting..................................................................61
Determine the Layer to Troubleshoot....................................................................................................61Layer 1 Issues........................................................................................................................................61
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?..................61
Is your ISP using a DSLAM that supports the Alcatel chipset?.....................................................61
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?...............61
Is the ATM interface in an administratively down state?...............................................................62
Is the cable pinout correct?..............................................................................................................62
Do you have the correct power supply for the Cisco 827?.............................................................63
Is the DSL operatingmode correct?..............................................................................................63
Is the circuit tested/provisioned correctly?......................................................................................63
Layer 2 Issues........................................................................................................................................63
Do you have the correct PVC values (VPI/VCI)?...........................................................................63Are you receiving data from your ISP?...........................................................................................63
Is a PPPoE session up?....................................................................................................................64
Are you receiving a PPPoE response from the aggregation router?...............................................65
Is PPP negotiating properly?...........................................................................................................65
How do I know if my PAP username and password are correct?...................................................69
How do I know if my CHAP username and password are correct?................................................69
How do I know when PPP authentication is successful?................................................................70
Why can I access some web pages with PPPoE but not others?.....................................................71
Additional MTU Troubleshooting Steps.........................................................................................72
Related Information...............................................................................................................................72
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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide
Contact the Cisco Technical Assistance Center.....................................................................................72
PPPoE Online Form............................... ...............................................................................................73
Record Information from the ISP..........................................................................................................73
Record Information About Your Network.............................................................................................74
Choose Your Next Step.........................................................................................................................74
PPPoE: PC as a PPPoE Client Troubleshooting.................................................................................75
Determine the Layer to Troubleshoot....................................................................................................75
Layer 1 Issues........................................................................................................................................75
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?..................75
Is your ISP using a DSLAM that supports the Alcatel chipset?.....................................................76
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?...............76
Is the ATM interface in an administratively down state?...............................................................76
Is the cable pinout correct?..............................................................................................................76
Do you have the correct power supply for the Cisco 827?.............................................................77
Is the DSL operatingmode correct?..............................................................................................77Is the circuit tested/provisioned correctly?......................................................................................77
Layer 2 Issues........................................................................................................................................77
Do you have the correct Permanent Virtual Circuit (PVC) values (VPI/VCI)?.............................77
Can you ping the default gateway from your PC?..........................................................................79
Is the bridge port in a forwarding state?..........................................................................................79
Is there an entry in the bridge table?...............................................................................................80
Related Information...............................................................................................................................80
Contact the Cisco Technical Assistance Center.....................................................................................81
Additional Information..........................................................................................................................81
Cisco DSL Router RFC1483 Pure Bridging.......................................................................................82
Tasks to Perform....................................................................................................................................82Configuration.........................................................................................................................................82
Troubleshoot Your Configuration..........................................................................................................83
StepbyStep Configuration of RFC1483 Pure Bridging.....................................................................83
StepbyStep Configuration.................................................................................................................83
Connect the Cisco DSL Router and Your PC.................................................................................83
Start and Set Up HyperTerminal.....................................................................................................83
Clear Existing Configurations on the Cisco DSL Router................................................................84
Configure the Cisco DSL Router....................................................................................................84
View Your Configuration................................................................................................................85
Configuration.........................................................................................................................................85
Troubleshoot Your Configuration..........................................................................................................86RFC1483 Pure Bridging Troubleshooting..........................................................................................86
Determine the Layer to Troubleshoot....................................................................................................86
Layer 1 Issues........................................................................................................................................87
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?..................87
Is your ISP using a DSLAM that supports the Alcatel chipset?.....................................................87
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?...............87
Is the ATM interface in an administratively down state?...............................................................87
Is the cable pinout correct?..............................................................................................................88
Do you have the correct power supply for the Cisco 827?.............................................................88
Is the DSL operatingmode correct?..............................................................................................89
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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide
Is the circuit tested/provisioned correctly?......................................................................................89
Layer 2 Issues........................................................................................................................................89
Do you have the correct Permanent Virtual Circuit (PVC) values (VPI/VCI)?.............................89
Can you ping the default gateway from your PC?..........................................................................90
Is the bridge port in a forwarding state?..........................................................................................91
Is there an entry in the bridge table?...............................................................................................92
Related Information...............................................................................................................................92
Contact the Cisco Technical Assistance Center.....................................................................................92
RFC1483 Pure Bridging Online Form..................................................................................................93
Record Information from the ISP..........................................................................................................93
Choose Your Next Step.........................................................................................................................94
StepbyStep Configuration of RFC1483 Routing with a Block of Static IP Addresses.....................94
StepbyStep Configuration.................................................................................................................94
Connect the Cisco DSL Router and Your PC.................................................................................94
Start and Set Up HyperTerminal.....................................................................................................95Clear Existing Configurations on the Cisco DSL Router................................................................95
Configure the Cisco DSL Router....................................................................................................96
View Your Configuration................................................................................................................97
Configuration.........................................................................................................................................97
Troubleshoot Your Configuration..........................................................................................................98
RFC1483 Routing with a Single Static IP Address...............................................................................98
Tasks to Perform....................................................................................................................................98
Configuration.........................................................................................................................................99
Troubleshoot Your Configuration........................................................................................................100
RFC1483 Routing with a Block of Static IP Addresses......................................................................100
Tasks to Perform..................................................................................................................................100Configuration.......................................................................................................................................101
Troubleshoot Your Configuration........................................................................................................101
RFC1483 Routing Implementation Options........................................................................................102
StepbyStep Configuration of RFC1483 Routing with a Single Static IP Address..........................102
StepbyStep Configuration...............................................................................................................102
Connect the Cisco DSL Router and Your PC...............................................................................102
Start and Set Up HyperTerminal...................................................................................................103
Clear Existing Configurations on the Cisco DSL Router..............................................................103
Configure the Cisco DSL Router..................................................................................................104
View Your Configuration..............................................................................................................105
Configuration.......................................................................................................................................106Troubleshoot Your Configuration........................................................................................................107
RFC1483 Routing Troubleshooting..................................................................................................107
Determine the Layer to Troubleshoot..................................................................................................107
Layer 1 Issues......................................................................................................................................108
Is the carrier detect (CD) light on the front panel of the Cisco DSL Router on or off?................108
Is your ISP using a DSLAM that supports the Alcatel chipset?...................................................108
Is the DSL port on the back of the Cisco DSL Router plugged into the DSL wall jack?.............108
Is the ATM interface in an administratively down state?.............................................................108
Is the cable pinout correct?............................................................................................................108
Do you have the correct power supply for the Cisco 827?...........................................................109
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Table of ContentsCisco DSL Router Configuration and Troubleshooting Guide
Is the DSL operatingmode correct?............................................................................................109
Is the circuit tested/provisioned correctly?....................................................................................110
Layer 2 Issues......................................................................................................................................110
Do you have the correct Permanent Virtual Circuit PVC values (VPI/VCI)?..............................110
Can you ping the default gateway?...............................................................................................111
Related Information.............................................................................................................................112
Contact the Cisco Technical Assistance Center...................................................................................112
ADSL WIC..........................................................................................................................................112
Hardware Requirements and Limitations for the ADSL WIC.............................................................113
Software Requirements and Limitations of Cisco ADSL WIC...........................................................114
Related Information.............................................................................................................................114
RFC1483 Routing Online Form.........................................................................................................115
Record Information from the ISP........................................................................................................115
Record Information About Your Network...........................................................................................116
Choose Your Next Step.......................................................................................................................116StepbyStep Configuration of IRB with a Dynamic IP Address......................................................116
StepbyStep Configuration...............................................................................................................116
Connect the Cisco DSL Router and Your PC...............................................................................117
Start and Set Up HyperTerminal...................................................................................................117
Clear Existing Configurations on the Cisco DSL Router..............................................................117
Configure the Cisco DSL Router..................................................................................................118
View Your Configuration..............................................................................................................120
Configuration.......................................................................................................................................120
Troubleshoot Your Configuration........................................................................................................121
IRB with a Dynamic IP Address..........................................................................................................121
Tasks to Perform..................................................................................................................................121Configuration.......................................................................................................................................122
Troubleshoot Your Configuration........................................................................................................123
StepbyStep Configuration of IRB with a Static IP Address............................................................124
StepbyStep Configuration...............................................................................................................124
Connect the Cisco DSL Router and Your PC...............................................................................124
Start and Set Up HyperTerminal...................................................................................................124
Clear Existing Configurations on the Cisco DSL Router..............................................................125
Configure the Cisco DSL Router..................................................................................................125
View Your Configuration..............................................................................................................127
Configuration.......................................................................................................................................127
Troubleshoot Your Configuration........................................................................................................128RFC1483 Bridging with IRB Implementation Options.......................................................................129
IRB with a Static IP Address...............................................................................................................129
Tasks to Perform..................................................................................................................................129
Configuration.......................................................................................................................................130
Troubleshoot Your Configuration........................................................................................................131
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Cisco DSL Router Configuration andTroubleshooting Guide
This document helps you configure your Cisco Digital Subscriber Line (DSL) Customer Premise Equipement
(CPE) Router for Asymmetric Digital Subscriber Line (ADSL) service. This document explains how to
configure ADSL service on the Cisco SOHO series, 820 series, and ADSL WAN interface cards (WICs). Four
service types are discussed, and a sample configuration is included for each service. These configurationswere built from a Cisco 827 Series router.
Note: When configuring an ADSL WIC, please verify the labeling of your ATM interfaces so that it
corresponds with ATM0 and the subinterface ATM0.1 on a Cisco DSL Router. Refer to the ADSL WIC
section for more ADSL WIC crossplatform information such as hardware and software requirements.
If you are not familiar with configuring Cisco devices, the stepbystep configuration examples may be
helpful in guiding you through the configuration process from start to finish.
The configuration instructions will help you do the following:
Gather required information from your Internet Service Provider (ISP).
Important: You must have this information to correctly configure your Cisco DSL Router.
The links to the ADSL services in the next section include forms for you to use in obtaining the
required information.
Configure your DSL Router.
Troubleshoot your ADSL service if it isn't working properly.
Open a case with the Cisco Technical Assistance Center (TAC) online or by telephone. This step may
be needed if you have used the troubleshooting procedure and your ADSL service is still not working.
Types of Service
Select a procedure based on the type of ADSL service your ISP provides.
PointtoPoint Protocol over Ethernet (PPPoE)
PointtoPoint Protocol over ATM (PPPoA)
RFC1483 Bridging
RFC1483 Routing
Top
All contents are Copyright 19922003 Cisco Systems Inc. All rights reserved. Important Notices and Privacy Statement.
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Cisco DSL Router Configuration and Troubleshooting
Guide
StepbyStep Configuration of a PC Acting as a PPPoEClient
Your Internet Service Provider (ISP) has provided you with a PointtoPoint Protocol over Ethernet (PPPoE)
connection and you are using a PPPoE client application on your PC.
StepbyStep Configuration
Important: Before you begin, close all programs on the PC that might be monitoring your COM port.
Devices such as PDAs and digital cameras often place programs in the system tray that will render your COM
port unusable for configuring your Cisco DSL Router.
Connect the Cisco DSL Router and Your PC
A console connection is made with a rolled cable and connects the console port of the Cisco Digital
Subscriber Line (DSL) Router to a COM port on a PC. The console cable that is included with the Cisco DSL
Router is a flat light blue cable. For more information on the pinouts of a rolled cable, or the pinouts of an
RJ45 to DB9 converter, see Cabling Guide for Console and AUX Ports.
Connect the RJ45 connector on one end of a Cisco console cable to the console port of the Cisco
DSL Router.
1.
Connect the RJ45 connector at the other end of the console cable to an RJ45 to DB9 converter.2.
Connect the DB9 connector to an open COM port on your PC.3.
Start and Set Up HyperTerminal
Start the HyperTerminal program on the PC.1.
Set up your HyperTerminal session.2.
Assign a name to your session, and clickOK.a.
From the Connect To window, clickCancel.b.
From the File menu, clickProperties.c.
From the Properties window, in the Connect Using list, select the COM port where you
connect the DB9 end of the console cable.
d.
From the Properties window clickConfigure and fill in the following values:
Bits per second: 9600
Data bits: 8
e.
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Parity: None
Stop bits: 1
Flow Control: None
ClickOK.f.
From the Call menu, clickDisconnect.g.
From the Call menu, clickCall.h.
Press Enter until you see a router prompt on your HyperTerminal screen.i.
Clear Existing Configurations on the Cisco DSL Router
Type enable at the router prompt to enter privileged mode.
Router>enable
Router#
! The # symbol indicates that you are in privileged mode.
1.
Clear existing configurations on the router.
Router#write erase
2.
Reload the router so it will boot with a blank startup configuration.
Router#reload
System configuration has been modified. Save? [yes/no]:no
Proceed with reload? [confirm]yes
! Reloading the router may take a few minutes.
3.
After the router has reloaded, enter enable mode again.
Router>enable
Router#
4.
Configure the Cisco DSL Router
Configure service timestamp to properly log and display debug output in the troubleshooting
section.
Router#configure terminal
Router(config)#service timestamps debug datetime msec
Router(config)#service timestamps log datetime msec
Router(config)#end
1.
Disable logging console on your Cisco DSL Router to suppress console messages that may be
triggered while you are configuring the router.
Router#configure terminal
Router(config)#no logging console
Router(config)#end
2.
Disable routing and configure a bridge protocol on your Cisco DSL Router.
Router#configure terminal
Router(config)#no ip routing
Router(config)#bridge 1 protocol ieee
Router(config)#end
3.
Configure a bridge group on the Cisco DSL Router Ethernet interface.
Router#configure terminal
4.
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Router(config)#interface ethernet 0
Router(configif)#bridge group 1
Router(configif)#no shut
Router(configif)#end
Configure the ATM interface of your Cisco DSL Router with an ATM permanent virtual circuit
(PVC), encapsulation type, and bridge group.
Router#configure terminal
Router(config)#interface atm 0
Router(configif)#bridgegroup 1Router(configif)#pvc
Router(configifatmvc)#encapsulation aal5snap
Router(configifatmvc)#no shut
Router(configifatmvc)#end
5.
Enable logging console on the Cisco DSL Router, and then write all the changes to memory.
Router#configure terminal
Router(config)#logging console
Router(config)#end
*Jan 1 00:00:00.100: %SYS5CONFIG_I: Configured from console by console
Router#write memory
Building configuration... [OK]
Router#
6.
View Your Configuration
Your Cisco DSL Router should now be operational for Asymmetric Digital Subscriber Line (ADSL) service.
You can issue a show run command to see the configuration.
Router#show run
Building configuration...
Configuration
Shown below is the configuration you built in the previous section, "StepbyStep Configuration".
Cisco DSL Router with a PC Acting as a PPPoE Client
! Comments contain explanations and additional information.
service timestamps debug datetime msec
service timestamps log datetime msec
!
no ip routing
!
interface ethernet0
no shut
no ip address
no ip directedbroadcast
bridgegroup 1
!
interface atm0
no shut
no ip address
no ip directedbroadcast
no atm ilmikeepalive
pvc
encapsulation aal5snap
! Common PVC values supported by ISPs are 0/35 or 8/35.
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! Confirm your PVC values with your ISP.
!
bridgegroup 1
!
bridge 1 protocol ieee
!
end
Troubleshoot Your ConfigurationIf your ADSL service is not working properly, see Troubleshooting a PC PPPoE Client.
Previous Page Main Page
All contents are Copyright 19922003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.
Cisco DSL Router Configuration and TroubleshootingGuide
RFC1483 Bridging with IRB Troubleshooting
Determine the Layer to Troubleshoot
There are many reasons why your Digital Subscriber Line (DSL) connection may not be functioning properly.
The goal of this section is to isolate the cause of the failure and repair it. The first troubleshooting step is to
determine which layer of your Asynchronous Digital Subscriber Line (ADSL) service is failing. There arethree layers in which the failure can occur.
Layer 1 DSL physical connectivity to your ISP's Digital Subscriber Line Access Multiplexer
(DSLAM)
Layer 2.1 ATM connectivity
Layer 2.2 PointtoPoint Protocol over ATM (PPPoA), PointtoPoint Protocol over Ethernet
(PPPoE), RFC1483 Bridging, or RFC1483 Routing
Layer 3 IP
The easiest way to determine which layer you should begin troubleshooting is to issue the command show ip
interface brief. The output of this command differs slightly depending on your configuration.
827ESC#show ip interface brief
Interface IPAddress OK? Method Status Protocol
ATM0 unassigned YES manual up up
ATM0.1 unassigned YES unset up up
Ethernet0 10.10.10.1 YES manual up up
If the statuses of ATM0 and ATM0.1 are up and the protocol is up, begin troubleshooting at Layer 2.
If the ATM interfaces are down, or if they keep coming up and then going down (they don't stay up and up),
begin troubleshooting at Layer 1.
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Layer 1 Issues
Is the carrier detect (CD) light on the front panel of the Cisco DSL Routeron or off?
If the CD light is on, go to the Layer 2 Issues section of this document.
If the CD light is off, continue with the next question.
Is your ISP using a DSLAM that supports the Alcatel chipset?
Verify this information with your ISP.
Is the DSL port on the back of the Cisco DSL Router plugged into theDSL wall jack?
If the DSL port is not plugged into the DSL wall jack, connect the port to the wall with a 4pin or 6pin
RJ11 cable. This is a standard telephone cable.
Is the ATM interface in an administratively down state?
To determine if the ATM0 interface is administratively down, issue the following command in enable mode
on the router:
Router#show interface atm 0
ATM0 is administratively down, line protocol is down
If the ATM0 interface status is administratively down, issue the no shutdown command under the ATM0
interface.
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface atm 0
Router(configif)#no shut
Router(configif)#end
Router#write memory
Is the cable pinout correct?
If the ATM0 interface status is down and down, the router is not seeing a carrier on the ADSL line. This
generally indicates one of two issues:
The active pins on the DSL wall jack are incorrect.1.
Your ISP has not turned up ADSL service on this wall jack.2.
Cisco DSL Router xDSL Port Pinouts
The RJ11 connector provides an xDSL connection to external media via a standard RJ11 6pin modular
jack.
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Pin Description
3 XDSL_Tip
4 XDSL_Ring
To determine if the ATM0 interface is down and down, issue the show interface atm 0 command from
enable mode of the router:
Router#show interface atm 0
ATM0 is down, line protocol is down
If the ATM interface is down and downnotadministratively downcheck the pinout of your DSL wall
jack. The DSL Router uses a standard RJ11 (4pin or 6pin) cable to provide the ADSL connection to the
wall jack. The center pair of pins on the RJ11 cable is used to carry the ADSL signal (pins 3 and 4 on a
6pin cable, or pins 2 and 3 on a 4 pin cable).
If you are sure you have the right pins on the wall jack and the ATM0 interface is still down and down,
replace the RJ11 cable between the ADSL port and your wall jack. If the interface is still down and down
after replacing the RJ11 cable, contact your ISP and have the ISP verify that ADSL service has been enabledon the wall jack you are using.
If you are not sure what pins on your wall jack are active, ask your ISP.
Do you have the correct power supply for the Cisco 827?
If you have verified that your ADSL cable is good and that you have the correct pinouts, the next step is to
make sure you have the correct power supply for the 827.
Note: The 827 does not use the same power supply as other 800 series routers.
To determine if you have the correct power supply, on the back of the power adapter look for Output +12V
0.1A, 12V 0.1A, +5V 3A, 24V 0.12A, and 71V 0.12A. If your power supply is missing the +12V and
12V feeds, then it is for a different Cisco 800 series router and will not work on the 827. Note that if you use
the wrong power supply, the Cisco 827 will power up but will be unable to train up (connect) to the ISP
DSLAM.
Is the DSL operatingmode correct?
If everything up to this point in the Layer 1 troubleshooting procedure is correct, the next step is to make sure
you have the correct DSL operating mode. Cisco recommends using dsl operatingmode auto if you are not
sure what DMT technology your ISP is using. The commands to configure operatingmode autodetection areas follows:
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#interface atm 0
Router(configif)#dsl operatingmode auto
Router(configif)#end
Router#write memory
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Is the circuit tested/provisioned correctly?
Obtain this information from your ISP or telephone company.
Layer 2 Issues
Do you have the correct PVC values (VPI/VCI)?
Complete the following steps to determine whether you have the correct virtual path identifier/virtual circuit
identifier (VPI/VCI) values configured on the router.
Verify your version of Cisco IOS software.
Important: This will not work with Cisco IOS Software Release 12.1(1)XB.
Router#show version
! Used to determine your Cisco IOS version.
Cisco Internetwork Operating System Software
IOS (tm) C820 Software (C820OSY656IM), Version 12.1(3)XG3,EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
! The two lines immediately preceding appear on one line on the router.
TAC:Home:SW:IOS:Specials for info
Copyright (c) 19862000 by cisco Systems, Inc.
Compiled Wed 20Dec00 16:44 by detang
Image textbase: 0x80013170, database: 0x80725044
1.
Configure the router for debug logging.2.
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#logging console
Router(config)#logging bufferRouter(config)#service timestamp debug datetime msec
Router(config)#service timestamp log datetime msec
Router(config)#end
Router#write memory
Building configuration...
[OK]
Router#terminal monitor
Enable debugging on the router.3.
Router#debug atm events
ATM events debugging is on
Router#2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EF74 length=52
2d18h: Data Cell received on vpi = 8 vci = 35
! Your VPI/VCI.
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EEC0 length=52
2d18h: Data Cell received on vpi = 8 vci = 35
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EECC length=52
2d18h: Data Cell received on vpi = 8 vci = 35
2d18h:
2d18h: RX interrupt: conid = 0, rxBd = 0x80C7EED8 length=52
2d18h: Data Cell received on vpi = 8 vci = 35
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Make sure you have debug ATM events running on the Cisco DSL Router, and then go to a working
Internet connection and begin to ping the IP address your ISP statically assigned to you.
It does not matter whether you have configured this IP address on the Cisco DSL Router. What is
important is that your ATM interface is up/up and that you are pinging the IP address your ISP gave
you. If you don't see the expected output after the ping test, contact your ISP for support.
4.
Disable debugging on the router.
>
Router#undebug all
! Used to turn off the debug events.
All possible debugging has been turned off.
Verify your VPI/VCI values, and then make the necessary changes to your configuration.
If you do not see output during the 60 seconds of debugging, contact your ISP.
5.
Can you ping the default gateway?
In a bridged environment, pinging the default gateway is a good test of connectivity. In general, if you can
ping to your default gateway, you know that Layer 1 and Layer 2 services are functioning properly. Issue the
ping command:
Router#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), roundtrip min/avg/max = 44/44/48 ms
Router#
OR
Router#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), roundtrip min/avg/max = 44/44/48 ms
Router#
A successful ping will take one of two forms. The first form will show an 80 percent success rate. The first
ping packet that is sent is lost (.!!!!). This is a successful pingthe first packet is lost while a Layer 2 to Layer
3 binding is created via address resolution protocol (ARP). The second form of the ping is a 100 percentsuccess rate, which is indicated by five exclamation points.
If your success rate is 80100 percent, try to ping a valid Internet address (198.133.219.25 is
www.cisco.com). If you can ping the default gateway from the router but you cannot ping another Internet
address, make sure you have only one static default route in the configuration (for example, IP route 0.0.0.0
0.0.0.0 192.168.1.1).
For the example above, if you already have a correct static default route and cannot ping Internet addresses,
contact your ISP to resolve the routing issue.
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If the ping test fails (a ping success rate of 0 percent), you see output similar to the output shown below. In
this case, continue with the troubleshooting steps that follow.
Router#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Router#
Is the bridge port in a forwarding state?
For your Cisco DSL Router to forward packets to your ISP, your bridged interface must be in a forwarding
state. If your bridged interface is in a blocking state, there is a loop in your network that you have to remove
before you are able to pass traffic. The most common cause of a loop in a ADSL network is having two
bridged ADSL circuits to the same ISP.
Router#show spanningtree
Bridge group 1 is executing the ieee compatible Spanning Tree protocol
Bridge Identifier has priority 32768, address 0000.0c5d.3694
Configured hello time 2, max age 20, forward delay 15
We are the root of the spanning tree
Topology change flag not set, detected flag not set
Number of topology changes 7 last change occurred 00:03:45 ago from ATM0.1
Times: hold 1, topology change 35, notification 2
hello 2, max age 20, forward delay 15
Timers: hello 0, topology change 0, notification 0, aging 300
Port 3 (ATM0) of Bridge group 1 is forwarding
Port path cost 1562, Port priority 128, Port Identifier 128.3.
Designated root has priority 32768, address 0000.0c5d.3694
Designated bridge has priority 32768, address 0000.0c5d.3694
Designated port id is 128.3, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 4
BPDU: sent 49843, received 0
Router#
Is there an entry in the bridge table?
When you are sure that your bridged interface is forwarding, you need to determine if you have the Layer 2
media access control (MAC) address of your ISP's gateway router. Use the show bridge command to check
for the Layer 2 address. This command lists all the Layer 2 entries for a specific bridge group.
Router#show bridge
Total of 300 station blocks, 299 free
Codes: P permanent, S self
Bridge Group 1:
Address Action Interface Age RX count TX count
0010.7bb9.bd1a forward ATM0 0 10 9
Router#
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In this case, you will probably see only a single entry in the bridge table. That entry should include the MAC
address of your default gateway. To verify whether you have the correct MAC address in your bridge table,
issue the command show arp. This command generally has four or more entries:
Bridge Group Virtual Interface (BVI)
Ethernet interface
Default gateway (connected to the BVI)
PC
You need to know the entry for your default gateway.
Router#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 192.168.1.2 0000.0c11.4e4c ARPA BVI1
Internet 192.168.1.1 10 0010.7bb9.db1a ARPA BVI1
Internet 10.1.1.1 108 0030.80c5.a665 ARPA Ethernet0
Internet 10.1.1.2 0030.96f8.45b8 ARPA Ethernet0
Router#
If the MAC address in the show bridge output matches a MAC address in the show arp output and the
corresponding interface is the BVI, your Layer 2 network is working properly.
If there isn't a MAC address match, ping your default gateway and issue the commands again. If there still
isn't a match, contact your ISP to verify your network settings.
Related Information
Cisco DSL Technology Support Information
Cisco DSL Product Support Information
Technical Support Cisco Systems
Contact the Cisco Technical Assistance Center
If you need additional assistance implementing RFC1483 bridging with IRB, contact the Cisco Technical
Assistance Center (TAC).
Note: To use the Case Open tool to open a case online, you must be a registered user and you must be logged
in.
Call the TAC
If you do not have a service contract with Cisco and need assistance implementing RFC1483 bridging with
IRB, direct your web browser to Cisco's Warranty Status Tool.
RFC1483 Bridging with IRB
Implementations PageMain Page
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Cisco DSL Router Configuration and Troubleshooting
Guide
RFC1483 Bridging with IRB Online Form
Before you can successfully configure your Cisco DSL Router with Asymmetric Digital Subscriber Line
(ADSL) service, you need specific information from your Internet Service Provider (ISP). If your ISP is
unsure, unable, or unwilling to provide answers to the questions outlined below, you may not be able to
correctly configure your Cisco DSL Router.
Forms are provided to help you obtain and record the information you need to build your own configuration.
Choose one of two formats for each form. Note that each format has different requirements for saving text that
you enter.
HTML Enter information in the forms on this page.
Important: To save your entries you must print this page. No other methods to save your information
are available at this time.
Microsoft Word Click here to open the forms in Microsoft Word. Fill in the forms, and then save
them on your local drive. Return to this page and continue with Choose Your Next Step at the bottom
of this page.
Important: If you need assistance with building or troubleshooting your configuration, you must have the
information in these forms accessible before you contact the Cisco Technical Assistance Center (TAC).
Record Information from the ISP
The following form includes questions about the name of the reseller where you purchased your Cisco DSL
Router and about the name of your ISP. The remaining questions you must ask your ISP. Fill in answers to all
questions.
Where did you purchase the Cisco DSL
Router (name of Reseller)?Reseller
What is the name of your ISP? ISP
Information to Request from Your ISP
Is your ISP offering you DMT or CAP
modulation?DMT CAP
Is your ISP using an Alcatel compliant or
a Cisco Systems DSLAM?
Alcatel Compliant Cisco
Other
What VPI/VCI pair values (also called the
PVC number) is your ISP using for your
DSL connection? For example, 8/35
VPI=8, VCI=35.
VPI VCI
If your ISP assigned a static IP address for
the Cisco DSL Router, what is the public
IP address and subnet mask?
IP Address
Subnet Mask
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Is your ISP providing a dynamically
generated IP address?Yes No
What is the IP address of the ISP's default
gateway (also called the next hop
address)?
ISP Default Gateway IP Address
Record Information About Your Network
Record the following information about your private network. This information is notrelated to the ISP.
Are you performing Network Address
Translation (NAT) on your private
network?
Yes No
Are you configuring the Cisco DSL
Router to act as a Dynamic Host Control
Protocol (DHCP) server?
Yes No
What IP address and subnet mask will you
configure on the Ethernet0 interface?
IP Address
Subnet Mask
Choose Your Next Step
When you have all the information you need from your ISP, select one of the following options based on
whether you have a new installation or are troubleshooting an existing one.
New DSL configuration
Troubleshooting my existing DSL connection
Previous Page Main Page
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Cisco DSL Router Configuration and Troubleshooting
Guide
StepbyStep Configuration of PPPoA with a Static IPAddress
Your Internet Service Provider (ISP) has assigned a static public IP address to your Cisco Digital Subscriber
Line (DSL) Router.
Note: A color code is used to relate tasks in this section with examples of configurations in the Configuration
section. Configurations are colorcoded as follows: Dynamic Host Configuration Protocol (DHCP) Server,
Network Address Translation (NAT).
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StepbyStep Configuration
Important: Before you begin, close all programs on the PC that might be monitoring your COM port.
Devices such as PDAs and digital cameras often place programs in the system tray that will render your COM
port unusable for configuring your Cisco DSL Router.
Connect the Cisco DSL Router and Your PC
A console connection is made with a rolled cable and connects the console port of the Cisco DSL Router to a
COM port on a PC. The console cable that is included with the Cisco DSL Router is a flat light blue cable.
For more information on the pinouts of a rolled cable, or the pinouts of an RJ45 to DB9 converter, see the
Cabling Guide for Console and AUX Ports.
Connect the RJ45 connector on one end of a Cisco console cable to the console port of the Cisco
DSL Router.
1.
Connect the RJ45 connector at the other end of the console cable to an RJ45 to DB9 converter.2.
Connect the DB9 connector to an open COM port on your PC.3.
Start and Set Up HyperTerminal
Start the HyperTerminal program on the PC.1.
Set up your HyperTerminal session.2.
Assign a name to your session, and clickOK.a.
From the Connect To window, clickCancel.b.
From the File menu, clickProperties.c.
From the Properties window, in the Connect Using list, select the COM port where you
connect the DB9 end of the console cable.
d.
From the Properties window clickConfigure and fill in the following values:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
e.
ClickOK.f.
From the Call menu, clickDisconnect.g.
From the Call menu, clickCall.h.
Press Enter until you see a router prompt on your HyperTerminal screen.i.
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Clear Existing Configurations on the Cisco DSL Router
Type enable at the router prompt to enter privileged mode.
Router>enable
Router#
! The # symbol indicates that you are in privileged mode.
1.
Clear existing configurations on the router.
Router#write erase
2.
Reload the router so it will boot with a blank startup configuration.
Router#reload
System configuration has been modified. Save? [yes/no]:no
Proceed with reload? [confirm]yes
! Reloading the router may take a few minutes.
3.
After the router has reloaded, enter enable mode again.
Router>enable
Router#
4.
Configure the Cisco DSL Router
Configure service timestamp to properly log and display debug output in the troubleshooting
section.
Router#configure terminal
Router(config)#service timestamps debug datetime msec
Router(config)#service timestamps log datetime msec
Router(config)#end
1.
Disable the logging console on your Cisco DSL Router to suppress console messages that may be
triggered while you are configuring the router.
Router#configure terminal
Router(config)#no logging console
Router(config)#end
2.
Configure ip routing, ip subnetzero, and ip classless to provide flexibility in
routing configuration options.
Router#configure terminal
Router(config)#ip routing
Router(config)#ip subnetzero
Router(config)#ip classless
Router(config)#end
3.
Configure an IP address and subnet mask on the Cisco DSL Router Ethernet interface.
(Optional) Enable NAT inside on the Ethernet interface.
Router#configure terminal
Router(config)#interface ethernet 0
Router(configif)#ip address
Router(configif)#ip nat inside
Router(configif)#no shut
Router(configif)#end
4.
Configure the ATM interface of your Cisco DSL Router with an ATM permanent virtual circuit
(PVC), encapsulation type, and Dialer pool.
Router#configure terminal
5.
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Router(config)#interface atm 0
Router(configif)#pvc
Router(configifatmvc)#encapsulation aal5mux ppp dialer
Router(configifatmvc)#dialer poolmember 1
Router(configifatmvc)#no shut
Router(configifatmvc)#end
Configure the Dialer interface of your Cisco DSL Router for PointtoPoint Protocol over ATM
(PPPoA) with a static IP address.
(Optional) Enable NAT outside on the Dialer interface.
Router#configure terminal
Router(config)#interface dialer 1
Router(configif)#ip address
Router(configif)#no ip directedbroadcast
Router(configif)#ip nat outside
Router(configif)#encapsulation ppp
Router(configif)#dialer pool 1
Router(configif)#ppp chap hostname
Router(configif)#ppp chap password
Router(configif)#ppp pap sentusername password
Router(configif)#end
6.
Configure a default route using Dialer1 as the outbound interface.
Router#configure terminal
Router(config)#ip route 0.0.0.0 0.0.0.0 dialer1
Router(config)#end
7.
Configure global NAT commands on the Cisco DSL Router to allow sharing of the static public IP
address of the Dialer interface.
Router#configure terminal
Router(config)#ip nat inside source list 1 interface dialer1 overload
Router(config)#accesslist 1 permit
Router(config)#end
Optional Configurations
NAT Pool, if additional IP addresses have been provided by your ISP.
Router(config)#ip nat inside source list 1 interface dialer1 overload
Router(config)#ip nat pool
netmask
Router(config)#end
Static NAT, if Internet users require access to internal servers.
Router(config)#ip nat inside source static tcp
{80 or 25} {80 or 25} extendable
Router(config)#end
8.
(Optional) Configure the Cisco DSL Router as a DHCP server with a pool of IP addresses to assign to
hosts connected to the Ethernet interface of the Cisco DSL Router. The DHCP server dynamically
assigns an IP address, Domain Name Server (DNS), and the default gateway IP address to your hosts.
Router#configure terminal
Router(config)#ip dhcp excludedaddress
Router(config)#ip dhcp pool
Router(dhcpconfig)#network
9.
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Router(dhcpconfig)#defaultrouter
Router(dhcpconfig)#dnsserver
Router(dhcpconfig)#end
Enable the logging console on the Cisco DSL Router, and write all the changes to memory.
Router#configure terminal
Router(config)#logging console
Router(config)#end
*Jan 1 00:00:00.100: %SYS5CONFIG_I: Configured from console by consoleRouter#write memory
Building configuration... [OK]
Router#
10.
View Your Configuration
Your Cisco DSL Router should now be operational for Asymmetric Digital Subscriber Line (ADSL) service.
You can issue a show run command to see the configuration.
Router#show run
Building configuration...
Configuration
Shown below is the configuration you built in the previous section, "StepbyStep Configuration".
Cisco DSL Router with a Static IP Address
! Comments contain explanations and additional information.
service timestamps debug datetime msec
service timestamps log datetime msec
ip subnetzero
!ip dhcp excludedaddress
ip dhcp pool
network
defaultrouter
dnsserver
!
interface ethernet0
no shut
ip address
ip nat inside
no ip directedbroadcast
!
interface atm0
no shutno ip address
no ip directedbroadcast
no ip mroutecache
pvc
encapsulation aal5mux ppp dialer
dialer poolmember 1
! Common PVC values supported by ISPs are 0/35 or 8/35.
! Confirm your PVC values with your ISP
!
!
interface dialer1
ip address
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no ip directedbroadcast
ip nat outside
encapsulation ppp
dialer pool 1
ppp chap hostname
ppp chap password
ppp pap sentusername password
!
ip nat inside source list 1 interface dialer1 overload
! If you have a pool (a range) of public IP addresses provided
! by your ISP, you can use a NAT Pool. Replace
! ip nat inside source list 1 interface dialer1 overload
! with the following two configuration statements:
! ip nat inside source list 1 pool overload
! ip nat pool
! netmask
! If Internet users require access to an internal server, you can
! add the following static NAT configuration statement:
! ip nat inside source static tcp {80 or 25}
! {80 or 25} extendable
! Note: TCP port 80 (HTTP/web) and TCP port 25 (SMTP/mail) are used
! for this example. You can open other TCP or UDP ports, if needed.!
ip classless
ip route 0.0.0.0 0.0.0.0 dialer1
accesslist 1 permit
! In this configuration, accesslist 1 defines a standard access list
! permitting the addresses that NAT will translate. For example, if
! your private IP network was 10.10.10.0, configuring
! accesslist 1 permit 10.10.10.0 0.0.0.255 would allow NAT to translate
! packets with source addresses between 10.10.10.0 and 10.10.10.255.
!
end
Troubleshoot Your Configuration
If your ADSL service is not working properly, see Troubleshooting PPPoA.
Previous Page Main Page
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Cisco DSL Router Configuration and TroubleshootingGuide
StepbyStep Configuration of PPPoA with a Dynamic IPAddress
Your Internet Service Provider (ISP) has assigned a dynamic public IP address to your Cisco Digital
Subscriber Line (DSL) Router.
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Note: A color code is used to relate tasks in this section with examples of configurations in the Configuration
section. Configurations are colorcoded as follows: Dynamic Host Configuration Protocol (DHCP) Server,
Network Address Translation (NAT).
StepbyStep Configuration
Important: Before you begin, close all programs on the PC that might be monitoring your COM port.
Devices such as PDAs and digital cameras often place programs in the system tray that will render your COMport unusable for configuring your Cisco DSL Router.
Connect the Cisco DSL Router and Your PC
A console connection is made with a rolled cable and connects the console port of the Cisco DSL Router to a
COM port on a PC. The console cable that is included with the Cisco DSL Router is a flat light blue cable.
For more information on the pinouts of a rolled cable, or the pinouts of an RJ45 to DB9 converter, see
Cabling Guide for Console and AUX Ports.
Connect the RJ45 connector on one end of a Cisco console cable to the console port of the Cisco
DSL Router.
1.
Connect the RJ45 connector at the other end of the console cable to an RJ45 to DB9 converter.2.
Connect the DB9 connector to an open COM port on your PC.3.
Start and Set Up HyperTerminal
Start the HyperTerminal program on the PC.1.
Set up your HyperTerminal session.2.
Assign a name to your session, and clickOK.a.
In the Connect To window, clickCancel.b.
From the File menu, clickProperties.c.
From the Properties window, in the Connect Using list, select the COM port where you
connect the DB9 end of the console cable.
d.
From the Properties window, clickConfigure and fill in the following values:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow Control: None
e.
ClickOK.f.
From the Call menu, clickDisconnect.g.
From the Call menu, clickCall.h.
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Press Enter until you see a router prompt on your HyperTerminal screen.i.
Clear Existing Configurations on the Cisco DSL Router
Type enable at the router prompt to enter privileged mode.
Router>enable
Router#
! The # symbol indicates that you are in privileged mode.
1.
Clear existing configurations on the router.
Router#write erase
2.
Reload the router so it will boot with a blank startup configuration.
Router#reload
System configuration has been modified. Save? [yes/no]:no
Proceed with reload? [confirm]yes
! Reloading the router may take a few minutes.
3.
After the router has reloaded, enter enable mode again.
Router>enable
Router#
4.
Configure the Cisco DSL Router
Configure service timestamp to properly log and display debug output in the troubleshooting
section.
Router#configure terminal
Router(config)#service timestamps debug datetime msec
Router(config)#service timestamps log datetime msec
Router(config)#end
1.
Disable the logging console on your Cisco DSL Router to suppress console messages that may be
triggered while you are configuring the router.
Router#configure terminal
Router(config)#no logging console
Router(config)#end
2.
Configure ip routing, ip subnetzero, and ip classless to provide flexibility in
routing configuration options.
Router#configure terminal
Router(config)#ip routing
Router(config)#ip subnetzero
Router(config)#ip classless
Router(config)#end
3.
Configure an IP address and subnet mask on the Cisco DSL Router Ethernet interface.
(Optional) Enable NAT inside on the Ethernet interface.
Router#configure terminal
Router(config)#interface ethernet 0
Router(configif)#ip address
Router(configif)#ip nat inside
Router(configif)#no shut
Router(configif)#end
4.
Configure the ATM interface of your Cisco DSL Router with an ATM permanent virtual circuit
(PVC), encapsulation type, and Dialer pool.
5.
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Router#configure terminal
Router(config)#interface atm 0
Router(configif)#pvc
Router(configifatmvc)#encapsulation aal5mux ppp dialer
Router(configifatmvc)#dialer poolmember 1
Router(configifatmvc)#no shut
Router(configifatmvc)#end
Configure the Dialer interface of your Cisco DSL Router for PointtoPoint Protocol over ATM
(PPPoA) to enable a dynamic IP address to be assigned.(Optional) Enable NAT outside on the Dialer interface.
Router#configure terminal
Router(config)#interface dialer 1
Router(configif)#ip address negotiated
Router(configif)#no ip directedbroadcast
Router(configif)#ip nat outside
Router(configif)#encapsulation ppp
Router(configif)#dialer pool 1
Router(configif)#ppp chap hostname
Router(configif)#ppp chap password
Router(configif)#ppp pap sentusername password
Router(configif)#end
6.
Configure a default route using Dialer1 as the outbound interface.
Router#configure terminal
Router(config)#ip route 0.0.0.0 0.0.0.0 dialer1
Router(config)#end
7.
Configure global NAT commands on the Cisco DSL Router to allow sharing of the dynamic public IP
address of the Dialer interface.
Router#configure terminal
Router(config)#ip nat inside source list 1 interface dialer1 overload
Router(config)#accesslist 1 permit
Router(config)#end
Optional Configurations
NAT Pool, if additional IP addresses have been provided by your ISP.
Router(config)#ip nat inside source list 1 interface dialer1 overload
Router(config)#ip nat pool
netmask
Router(config)#end
Static NAT, if Internet users require access to internal servers.
Router(config)#ip nat inside source static tcp
{80 or 25} {80 or 25} extendable
Router(config)#end
8.
(Optional) Configure the Cisco DSL Router as a DHCP server with a pool of IP addresses to assign to
hosts connected to the Ethernet interface of the Cisco DSL Router. The DHCP server dynamically
assigns an IP address, Domain Name Server (DNS), and the default gateway IP address to your hosts.
Router#configure terminal
Router(config)#ip dhcp excludedaddress
Router(config)#ip dhcp pool
9.
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Router(dhcpconfig)#network
Router(dhcpconfig)#defaultrouter
Router(dhcpconfig)#dnsserver
Router(dhcpconfig)#end
Enable the logging console on the Cisco DSL Router, and write all the changes to memory.
Router#configure terminal
Router(config)#logging console
Router(config)#end*Jan 1 00:00:00.100: %SYS5CONFIG_I: Configured from console by console
Router#write memory
Building configuration... [OK]
Router#
10.
View Your Configuration
Your Cisco DSL Router should now be operational for Asymetric Digital Subscriber Line (ADSL) service.
You can issue a show run command to see the configuration.
Router#show run
Building configuration...
Configuration
Shown below is the configuration you built in the previous section, "StepbyStep Configuration".
Cisco DSL Router with a Dynamic IP Address
! Comments contain explanations and additional information.
service timestamps debug datetime msec
service timestamps log datetime msec
ip subnetzero!
ip dhcp excludedaddress
ip dhcp pool
network
defaultrouter
dnsserver
!
interface ethernet0
no shut
ip address
ip nat inside
no ip directedbroadcast
!
interface atm0no shut
no ip address
no ip directedbroadcast
no ip mroutecache
pvc
encapsulation aal5mux ppp dialer
dialer poolmember 1
! Common PVC values supported by ISPs are 0/35 or 8/35.
! Confirm your PVC values with your ISP.
!
interface dialer1
ip address negotiated
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no ip directedbroadcast
ip nat outside
encapsulation ppp
dialer pool 1
ppp chap hostname
ppp chap password
ppp pap sentusername password
!
ip nat inside source list 1 interface dialer1 overload
! If you have a pool (a range) of public IP addresses provided
! by your ISP, you can use a NAT Pool. Replace
! ip nat inside source list 1 interface dialer1 overload
! with the following two configuration statements:
! ip nat inside source list 1 pool overload
! ip nat pool
! netmask
! If Internet users require access to an internal server, you can
! add the following static NAT configuration statement:
! ip nat inside source static tcp {80 or 25}
! {80 or 25} extendable
! Note: TCP port 80 (HTTP/web) and TCP port 25 (SMTP/mail) are used
! for this example. You can open other TCP or UDP ports, if needed.!
ip classless
ip route 0.0.0.0 0.0.0.0 dialer1
accesslist 1 permit
! In this configuration, accesslist 1 defines a standard access list
! permitting the addresses that NAT will translate. For example, if
! your private IP network was 10.10.10.0, configuring
! accesslist 1 permit 10.10.10.0 0.0.0.255 would allow NAT to translate
! packets with source addresses between 10.10.10.0 and 10.10.10.255.
!
end
Troubleshoot Your Configuration
If your ADSL service is not working properly, see Troubleshooting PPPoA.
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Cisco DSL Router Configuration and TroubleshootingGuide
Cisco DSL Router PPPoA with a Dynamic IP Address
Your Internet Service Provider (ISP) has assigned a dynamic public IP address to your Cisco Digital
Subscriber Line (DSL) Router.
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Tip: If you are not familiar with configuring Cisco devices and would like to follow a stepbystep
configuration, click here.
Tasks to Perform
Note: A color code is used to relate tasks in this section with examples of configurations in the Configuration
section