Variable Length Subnetting

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Variable Length Variable Length Subnetting Subnetting Jim Blanco Jim Blanco Aparicio-Levy Technical Aparicio-Levy Technical Center Center

description

Variable Length Subnetting. Jim Blanco Aparicio-Levy Technical Center. Variable Length Subnetting. VLSM allows us to use one class C address to design a networking scheme to meet the following requirements: Perth 60 users Kula Lumpur 28 users Sydney12 users Singapore12 users - PowerPoint PPT Presentation

Transcript of Variable Length Subnetting

Page 1: Variable Length Subnetting

Variable Length SubnettingVariable Length Subnetting

Jim BlancoJim Blanco

Aparicio-Levy Technical CenterAparicio-Levy Technical Center

Page 2: Variable Length Subnetting

Variable Length SubnettingVariable Length Subnetting

VLSM allows us to use one class C VLSM allows us to use one class C address to design a networking scheme to address to design a networking scheme to meet the following requirements:meet the following requirements:

Perth Perth 60 users60 usersKula Lumpur Kula Lumpur 28 users28 usersSydneySydney 12 users12 usersSingaporeSingapore 12 users12 usersWAN links between each routerWAN links between each router

Page 3: Variable Length Subnetting

Networking Requirements

Kula 60

Perth 60

Sydney 60Sing. 60

WAN 2WAN 2

WAN 2

•Classful subnetting is very wasteful. •In the example above, a /26 was used to provide the 60 addresses for Perth and the other LANs. There are no addresses left for WAN links

Page 4: Variable Length Subnetting

VLSMVLSM

Forget everything you learned about Forget everything you learned about classfull subnetting. classfull subnetting.

Just remember you have 256 – 2 = 254 Just remember you have 256 – 2 = 254 addresses to work with.addresses to work with.

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VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0

Kula/28Kula/28

Sydney/12Sydney/12

Sing/12Sing/12

WAN1/2WAN1/2

WAN2/2WAN2/2

WAN3\2WAN3\2

List your network requirements in descending order.

Page 6: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28

Sydney/12Sydney/12

Sing/12Sing/12

WAN1/2WAN1/2

WAN2/2WAN2/2

WAN3\2WAN3\2

Calculate the subnet mask to meet largest requirement - Perth

Page 7: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12

Sing/12Sing/12

WAN1/2WAN1/2

WAN2/2WAN2/2

WAN3\2WAN3\2

Keep track of subnet and broadcast addresses. Use the next available Address .64 to calculate a subnet mask for the next largest requirement - Kula Lumpur.

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VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.64192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12 192.168.12192.168.12..96 .97- .110.97- .110 .111.111 192.168.12.96\28192.168.12.96\28

Sing/12Sing/12

WAN1/2WAN1/2

WAN2/2WAN2/2

WAN3\2WAN3\2

Sydney needs 12 addresses. Use the next available address .96 to calculatea subnet for Sydney’s requirement for 12

Page 9: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.64192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12 192.168.12.96192.168.12.96 .97- .110.97- .110 .111.111 192.168.12.96\28192.168.12.96\28

Sing/12Sing/12 192.168.12.192.168.12.112 .113 - .126.113 - .126 .127.127 192.168.12.112\28192.168.12.112\28

WAN1/2WAN1/2

WAN2/2WAN2/2

WAN3\2WAN3\2

Singapore also requires 12

Page 10: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.64192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12 192.168.12.96192.168.12.96 .97- .110.97- .110 .111.111 192.168.12.96\28192.168.12.96\28

Sing/12Sing/12 192.168.12.112192.168.12.112 .113 - .126.113 - .126 .127.127 192.168.12.112\28192.168.12.112\28

WAN1/2WAN1/2 192.168.12.192.168.12.128 .129 - .130 .129 - .130 .131.131 192.168.12.128\30192.168.12.128\30

WAN2/2WAN2/2

WAN3\2WAN3\2

WAN links require 2 addresses each

Page 11: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.64192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12 192.168.12.96192.168.12.96 .97- .110.97- .110 .111.111 192.168.12.96\28192.168.12.96\28

Sing/12Sing/12 192.168.12.112192.168.12.112 .113 - .126.113 - .126 .127.127 192.168.12.112\28192.168.12.112\28

WAN1/2WAN1/2 192.168.12.128192.168.12.128 .129 - .130 .129 - .130 .131.131 192.168.12.128\30192.168.12.128\30

WAN2/2WAN2/2 192.168.12.192.168.12.132 .133 - 134.133 - 134 .135.135 192.168.12.132\30192.168.12.132\30

WAN3\2WAN3\2

Page 12: Variable Length Subnetting

VLSMVLSM

Name/requiredName/required

addressesaddresses

Subnet Subnet addressaddress

Address rangeAddress range BroadcastBroadcast Address\subnetAddress\subnet

Perth/60Perth/60 192.168.12.0192.168.12.0 .1 - 62.1 - 62 .63.63 192.168.12.0\26192.168.12.0\26

Kula/28Kula/28 192.168.12.64192.168.12.64 .65 - .94.65 - .94 .95.95 192.168.12.64\27192.168.12.64\27

Sydney/12Sydney/12 192.168.12.96192.168.12.96 .97- .110.97- .110 .111.111 192.168.12.96\28192.168.12.96\28

Sing/12Sing/12 192.168.12.112192.168.12.112 .113 - .126.113 - .126 .127.127 192.168.12.112\28192.168.12.112\28

WAN1/2WAN1/2 192.168.12.128192.168.12.128 .129 - .130 .129 - .130 .131.131 192.168.12.128\30192.168.12.128\30

WAN2/2WAN2/2 192.168.12.132192.168.12.132 .133 - 134.133 - 134 .135.135 192.168.12.132\30192.168.12.132\30

WAN3\2WAN3\2 192.168.12.192.168.12.136 .137 - .138.137 - .138 .139.139 192.168.12.136\30192.168.12.136\30

The networking problem is solved

Page 13: Variable Length Subnetting

Networking Scheme

Kula 192.168.10.64/27

Perth 192.168.10.0/26

Sydney 192.168.10.96/28Sing. 192.168.10.112/28

WAN 192.198.10.129 and 130WAN 192.198.10.133 and 134

WAN 192.198.10.137 and 138

Apply the address to the LAN or WAN link

Page 14: Variable Length Subnetting

VLSMVLSM

•A class C address such as 192.168.12.0 contains 256 - 2 = 254 usable addresses

•You used only addresses .0 - .139


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