a rp, b gp, i c mp it’s easy as 123
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ARP, BGP, ICMP
It’s easy as 123
How to find your MAC address(es)• Why plural?– Each adapter has its own MAC address
ifconfig -a
XX:XX:XX:YY:YY:YYInterface IDVendor ID
Intel owns
00:90:2700:A0:8300:A0:C9 00:AA:00
…
Cisco owns
00:90:B100:90:2B00:90:8600:90:92
…
Routing on MAC Addresses
H2
H1H3
S1 S2
AA:AA:AA:AA:AA:AA CC:CC:CC:CC:CC:CC
BB:BB:BB:BB:BB:BB
Dest Port
AA:AA:AA:AA:AA:AA
1
BB:BB:BB:BB:BB:BB
2
CC:CC:CC:CC:CC:CC
3
1
2 3
Learning Switch Routing Table for S1
P
LAN 1
K
Router LAN 1
PE
F0-0D-F0-0D-F0-0D
C0-FF-EE-DE-CA-FF
22-22-22-88-88-88
44-44-44-55-55-55
BE-EF-BE-EF-BE-EFPanda Express
192.168.0.1Panda
192.168.0.5Kay
192.168.0.100Router (Port 1)
65.91.53.96Router (Port 2)
65.91.7.210
Q1: Panda Express
Internet Control Message Protocol (ICMP)
• Communicate Network Layer information• Two uses
1) Diagnosis (Error reporting)2) Discovery
• Examples:– Ping/pong– Destination network/host/port unreachable– Source quench– Router advertisement/discovery– TTL expired, Bad IP header, Need fragmentation…
Ping
ping www.google.com
Traceroute
TTL Expired
traceroute www.google.com
Tracepath
Need Fragmentation (PMTU Discovery)
tracepath www.google.com
…
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