CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration...

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CSE 127 Week 8 Discussion Ariana Mirian Zoom Props to Deian Stefan for Slides

Transcript of CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration...

Page 1: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

CSE127Week8DiscussionArianaMirian

Zoom

PropstoDeian StefanforSlides

Page 2: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Thisisbeingrecorded

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PA4duetomorrow!

Page 4: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

OverviewofToday

• Overviewoflasttwolectures• Somenewinformation

• BriefoverviewofPA5• ToolsthatmightbehelpfulduringthePA

• Openofficehours(iftime)

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OSI Layers(Open Systems Interconnection)

Application• End user layer• HTTP, FTP, Skype, SSH, SMTP, DNS

Presentation• Syntax, byte order, compression, encryption• SSL, SSH, MPEG, JPEG

Session• Connection establishment and maintenance• APIs, sockets

Transport• End-to-end connections between processes• TCP, UDP

Network• Addressing, routing between nodes• IP

Data Link• Link management, frames• Ethernet, WiFi

Physical• Physical wires• Photons, RF modulation

Page 6: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Basic Internet Archictecture “Hourglass”Narrow waist = interoperability

IP

Copper Fiber

TCP

FTPHTTPSMTPDNSNTP

IP

Cellular

Radio

WiFi Ethernet

UDP

Application layer

Transport layer

Network layer

Link layer

Physical layer

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Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

Page 8: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

1. YourlaptopusesDHCP(DynamicHostConfigurationProtocol)tobootstrapitselfonthelocalnetwork.

Page 9: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

1. YourlaptopusesDHCP(DynamicHostConfigurationProtocol)tobootstrapitselfonthelocalnetwork.A. Newhostdoesn’thaveanIPaddress,doesn’tknowwhotoask

Page 10: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

1. YourlaptopusesDHCP(DynamicHostConfigurationProtocol)tobootstrapitselfonthelocalnetwork.A. Newhostdoesn’thaveanIPaddress,doesn’tknowwhotoaskB. BroadcastsDHCPDISCOVERto255.255.255.255withitsMACaddress

Page 11: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

1. YourlaptopusesDHCP(DynamicHostConfigurationProtocol)tobootstrapitselfonthelocalnetwork.A. Newhostdoesn’thaveanIPaddress,doesn’tknowwhotoaskB. BroadcastsDHCPDISCOVERto255.255.255.255withitsMACaddressC. DHCPserverrespondswithconfig:leaseonhostIPaddress,gatewayIP

address,DNSserverinformation

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Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

2.YourlaptopmakesanARPrequesttolearntheMACaddressofthelocalrouter.

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Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

2.YourlaptopmakesanARPrequesttolearntheMACaddressofthelocalrouter.

A. Everyconnectionoutsidethelocalnetworkwillbeencapsulatedinalink-layerframewiththelocalrouter’sMACaddressasthedestination.

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Workingexample

Youconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

2.YourlaptopmakesanARPrequesttolearntheMACaddressofthelocalrouter.

A. Everyconnectionoutsidethelocalnetworkwillbeencapsulatedinalink-layerframewiththelocalrouter’sMACaddressasthedestination.

B. YourlaptopencapsulateseachIPpacketinanEthernetframeaddressedtothelocalrouter

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

2.YourlaptopmakesanARPrequesttolearntheMACaddressofthelocalrouter.

A. Everyconnectionoutsidethelocalnetworkwillbeencapsulatedinalink-layerframewiththelocalrouter’sMACaddressasthedestination.

B. YourlaptopencapsulateseachIPpacketinaWIFIEthernetframeaddressedtothelocalrouter

C. Thelocalrouterde-capsulates theseEthernetframesandre-encodesthemtoforwardthemonitsfiberconnectiontoitsupstreamISP,ortoanotherpartofthenetwork.

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

2.YourlaptopmakesanARPrequesttolearntheMACaddressofthelocalrouter.

A. Everyconnectionoutsidethelocalnetworkwillbeencapsulatedinalink-layerframewiththelocalrouter’sMACaddressasthedestination.

B. YourlaptopencapsulateseachIPpacketinaWIFIEthernetframeaddressedtothelocalrouter

C. Thelocalrouterde-capsulates theseEthernetframesandre-encodesthemtoforwardthemonitsfiberconnectiontoitsupstreamISP,ortoanotherpartofthenetwork.

D. Eachhopre-encodesthelinklayerforitsownnetwork.

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

3.YoulaptopdoesaDNSlookuponucsd.eduA. ItlearnedtheIPaddressofaDNSserverfromtherouterorwasalready

hardcodedin(8.8.8.8)

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

3.YoulaptopdoesaDNSlookuponucsd.eduA. ItlearnedtheIPaddressofaDNSserverfromtherouterorwasalready

hardcodedin(8.8.8.8)B. EachrequestisaDNSqueryencapsulatedinoneormoreUDPpackets

encapsulatedinoneormoreIPpackets

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

3.YoulaptopdoesaDNSlookuponucsd.eduA. ItlearnedtheIPaddressofaDNSserverfromtherouterorwasalready

hardcodedin(8.8.8.8)B. EachrequestisaDNSqueryencapsulatedinoneormoreUDPpackets

encapsulatedinoneormoreIPpacketsC. Eachresponsetellsthelaptopwhatauthoritynameserver toquery,untilit

learnsthefinalIPAddress(132.239.180.101)forucsd.edu

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

3.YoulaptopdoesaDNSlookuponucsd.eduA. ItlearnedtheIPaddressofaDNSserverfromtherouterorwasalready

hardcodedin(8.8.8.8)B. EachrequestisaDNSqueryencapsulatedinoneormoreUDPpackets

encapsulatedinoneormoreIPpacketsC. Eachresponsetellsthelaptopwhatauthoritynameserver toquery,untilit

learnsthefinalIPAddress(132.239.180.101)forucsd.eduD. Thisaddressiscached,alongwiththeauthoritiesforthehierarchyinthe

hostname

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

4.YoulaptopopensaTCPconnectionto132.239.180.101

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

4.YoulaptopopensaTCPconnectionto132.239.180.101A. EachpacketoftheTCPhandshakeisencodedinanIPpacketthatis

encodedasEthernetframesthataredecodedandre-encodedastheypassthroughthenetwork

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

4.YoulaptopopensaTCPconnectionto132.239.180.101A. EachpacketoftheTCPhandshakeisencodedinanIPpacketthatis

encodedasEthernetframesthataredecodedandre-encodedastheypassthroughthenetwork

B. ThelocalrouterhasaroutingtablethatcontainsIPprefixesthatitmatchesagainsttheIPaddressthattellsitwhataddresstoforwardthepacketsto

Page 24: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

4.YoulaptopopensaTCPconnectionto132.239.180.101A. EachpacketoftheTCPhandshakeisencodedinanIPpacketthatis

encodedasEthernetframesthataredecodedandre-encodedastheypassthroughthenetwork

B. ThelocalrouterhasaroutingtablethatcontainsIPprefixesthatitmatchesagainsttheIPaddressthattellsitwhataddresstoforwardthepacketsto

C. ThepacketpassesthroughaseriesofAutonomousSystems(AS)

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

4.YoulaptopopensaTCPconnectionto132.239.180.101A. EachpacketoftheTCPhandshakeisencodedinanIPpacketthatis

encodedasEthernetframesthataredecodedandre-encodedastheypassthroughthenetwork

B. ThelocalrouterhasaroutingtablethatcontainsIPprefixesthatitmatchesagainsttheIPaddressthattellsitwhataddresstoforwardthepacketsto

C. ThepacketpassesthroughaseriesofAutonomousSystems(AS)D. E.g.sbcglobal.net ->att.net ->leve3.net->cenic.net ->ucsd.edu

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WorkingexampleYouconnectyourlaptoptoacaféwifi networkandtypeucsd.edu intoyourbrowser’sURLbar.Whathappens?

5.YourlaptopsendsaHTTPGETrequestinsidetheTCPconnection6.BasedontheHTTPresponse,yourlaptopperformsanewDNSlookup,TCPhandshake,andHTTPGETforeveryresourceintheHTMLasitrenders

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Networkattacksoverview

• DNSCachepoisoning

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https://www.cloudflare.com/learning/dns/dns-over-tls/

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https://www.cloudflare.com/learning/dns/dns-over-tls/

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DNSoverTLSandDNSoverHTTPS

• DNSoverTLS– usesTLSoverUDPtoprotectDNSqueries• Port853

• DNSoverHTTPS– usesHTTPSprotocol/porttotransferDNSqueries• Port443

• Whytwodifferentsolutions?Aren’ttheythesame?• Twodifferentprotocols/groupsofpeoplewritingthem• ProsandConsofeach

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https://blog.chromium.org/2020/05/a-safer-and-more-private-browsing-DoH.html

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Networkattacksoverview

• DNSCachepoisoning• DenialofService• Resourceconsumptionofservice• TCPhandshakesareexpensive

• Networkperimeterdefenses• Heyyou!Getoffmyfirewall!

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PA5Overview!

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PA5overview

• PlannedtobereleasedThursdayorFriday,2weekstofinishit(harddeadlineofJune11th becauseweneedtoturningrades)• Scavengerhunt!YouneedtofindStefan’s“password”• Nothisactualpassword…

• We’llsendyouanemailwithatarfile• Fromthere,needtofigureouthowtogetthepassword• Scavengerhuntsopleasebecautiousofspoilers…cometoofficehoursorutilizeprivatepostsonPiazza

Page 35: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Overviewoftoolsyoumayneed

• nc• nmap• ssh• tcpdump• wget

Page 36: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Overviewoftoolsyoumayneed

• Nc – allowsyoutomakeconnectionslocally• Nmap – scanports/IPs(locallyandexternally)• Ssh – connecttoservers• Tcpdump – viewtrafficonmachine• Wget – downloadoffilesfrominternet

• Allofthesehave“man”pages!

Page 37: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

NetCat (shoutout toJuliaEvans)

Page 38: CSE 127 Week 8 Discussion · 2020-05-20 · 1. Your laptop uses DHCP (Dynamic Host Configuration Protocol) to bootstrap itself on the local network. A. New host doesn’t have an

Happyhunting!


Cisco IOS DHCP Server - community.cisco.com · Cisco IOS DHCP Server 1 Cisco IOS DHCP Server Feature Overview Dynamic Host Control Protocol (DHCP) enables y ou to automatically assign

Cisco IOS DHCP Server - community.cisco.com · Cisco IOS DHCP Server 1 Cisco IOS DHCP Server Feature Overview Dynamic Host Control Protocol (DHCP) enables y ou to automatically assign

Dhcp(Dynamic Host Configuration Protocol)

Dhcp(Dynamic Host Configuration Protocol)

S2800 Series Ethernet Switches DHCP Configuration | FS€¦ · technology. Dynamic host configuration protocol (DHCP) is developed in this background. DHCP adopts a client/server

S2800 Series Ethernet Switches DHCP Configuration | FS€¦ · technology. Dynamic host configuration protocol (DHCP) is developed in this background. DHCP adopts a client/server

DHCP - academic.nimal.info · DHCP Components •DHCP client: •a host using DHCP to obtain an IP address and other configuration information •DHCP server: •a host that returns

DHCP - academic.nimal.info · DHCP Components •DHCP client: •a host using DHCP to obtain an IP address and other configuration information •DHCP server: •a host that returns

Chapter 22 Bootstrap and Auto configuration (DHCP) History of Bootstrap -Bootstrap is used to assign IP address to the computer. -Constant changes in the.

Chapter 22 Bootstrap and Auto configuration (DHCP) History of Bootstrap -Bootstrap is used to assign IP address to the computer. -Constant changes in the.

Open Modbus/TCP Protocol API - hilscher.com · BOOTP Bootstrap Protocol DHCP Dynamic Host Configuration Protocol DPM Dual Port Memory IP Internet Protocol OMB Open Modbus/TCP TCP

Open Modbus/TCP Protocol API - hilscher.com · BOOTP Bootstrap Protocol DHCP Dynamic Host Configuration Protocol DPM Dual Port Memory IP Internet Protocol OMB Open Modbus/TCP TCP

Lesson 6: Dynamic Host Configuration Protocol DHCP (Part1)

Lesson 6: Dynamic Host Configuration Protocol DHCP (Part1)

DHCP - ActForNet · 2014. 11. 15. · 2 Concepts of DHCP DHCP Dynamic Host Configuration Protocol (DHCP) enables a client to dynamically obtain a valid IP address. DHCP server A DHCP

DHCP - ActForNet · 2014. 11. 15. · 2 Concepts of DHCP DHCP Dynamic Host Configuration Protocol (DHCP) enables a client to dynamically obtain a valid IP address. DHCP server A DHCP

DHCP, NAT, ARP, ND - jpadilla.docentes.upbbga.edu.cojpadilla.docentes.upbbga.edu.co/Telematica/DHCP-NAT-ARP-ND.pdf · DHCP •DHCP: Dynamic Host Configuration Protocol •Permite

DHCP, NAT, ARP, ND - jpadilla.docentes.upbbga.edu.cojpadilla.docentes.upbbga.edu.co/Telematica/DHCP-NAT-ARP-ND.pdf · DHCP •DHCP: Dynamic Host Configuration Protocol •Permite

CBMR - AIX Booting Procedures...The AIX recovery environment may boot over the network using either Dynamic Host Control Protocol (DHCP) or Bootstrap Protocol (BOOTP) or directly from

CBMR - AIX Booting Procedures...The AIX recovery environment may boot over the network using either Dynamic Host Control Protocol (DHCP) or Bootstrap Protocol (BOOTP) or directly from

Dynamic Host Configuration Protocol (DHCP)

Dynamic Host Configuration Protocol (DHCP)

Dynamic Host Configuration Protocol (DHCP)whp-hou9.cold.extweb.hp.com/.../SR7000dl-Basic-C13-DHCP-Nov2006.pdf · 13-3 Dynamic Host Configuration Protocol (DHCP) Overview Overview

Dynamic Host Configuration Protocol (DHCP)whp-hou9.cold.extweb.hp.com/.../SR7000dl-Basic-C13-DHCP-Nov2006.pdf · 13-3 Dynamic Host Configuration Protocol (DHCP) Overview Overview

Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS)

Dynamic Host Configuration Protocol (DHCP) and Domain Name System (DNS)

Implementing Dynamic Host Configuration Protocol (DHCP) net - Chapter10 DHCP.pdf · In this chapter, you learn how to use the Dynamic Host Configuration Protocol (DHCP) to automatically

Implementing Dynamic Host Configuration Protocol (DHCP) net - Chapter10 DHCP.pdf · In this chapter, you learn how to use the Dynamic Host Configuration Protocol (DHCP) to automatically

DHCP Dynamic Host Configuration Protocol · 2019. 1. 6. · DHCP 1 Università di Palermo LA DHCP Dynamic Host Configuration Protocol L’assegnazione automatica dei parametri di

DHCP Dynamic Host Configuration Protocol · 2019. 1. 6. · DHCP 1 Università di Palermo LA DHCP Dynamic Host Configuration Protocol L’assegnazione automatica dei parametri di

Bootstrap and Autoconfiguration (DHCP)

Bootstrap and Autoconfiguration (DHCP)

DHCP & Firewall & NAT. DHCP – Dynamic Host Configuration Protocol.

DHCP & Firewall & NAT. DHCP – Dynamic Host Configuration Protocol.

[MS-DHCPM-Diff]: Microsoft Dynamic Host Configuration Protocol (DHCP) Server …... · 2017. 5. 25. · Microsoft Dynamic Host Configuration Protocol (DHCP) Server Management Protocol

[MS-DHCPM-Diff]: Microsoft Dynamic Host Configuration Protocol (DHCP) Server …... · 2017. 5. 25. · Microsoft Dynamic Host Configuration Protocol (DHCP) Server Management Protocol

Module 3: Managing and Monitoring Dynamic Host Configuration Protocol (DHCP)

Module 3: Managing and Monitoring Dynamic Host Configuration Protocol (DHCP)

[MS-DHCPE]: Dynamic Host Configuration Protocol (DHCP) …... · 2018. 9. 6. · [MS-DHCPE]: Dynamic Host Configuration Protocol (DHCP) Extensions ... 2. 3.

[MS-DHCPE]: Dynamic Host Configuration Protocol (DHCP) …... · 2018. 9. 6. · [MS-DHCPE]: Dynamic Host Configuration Protocol (DHCP) Extensions ... 2. 3.