Lecture-13 - Lecture #13 Todays Lecture Objectives Review...

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Lecture #13
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Today’s Lecture Objectives • Review (finish routing) • ICMP • IPv6 (and IPv4/v6 tunneling) • DHCP
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Internet Control Message Protocol (ICMP) • Used to send information about “problems” among various network devices (including senders and receivers) – Example: TTL expiration – Example: need to fragment, but DF set • Encapsulated in an IP packet
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ICMP Examples Type Code description 0 0 echo reply (ping) 3 0 dest. network unreachable 3 1 dest host unreachable 3 2 dest protocol unreachable 3 3 dest port unreachable 3 6 dest network unknown 3 7 dest host unknown 4 0 source quench (congestion control - not used) 8 0 echo request (ping) 9 0 route advertisement 10 0 router discovery 11 0 TTL expired 12 0 bad IP header
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Traceroute Using ICMP • Send packet with TTL=x – Start with 1, then 2, … • TTL will reach 0, ICMP will be sent – By incrementing TTL value, responses provide a trace of the path • Traceroute typically does each TTL value three times
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This note was uploaded on 02/19/2012 for the course ENGR 361 taught by Professor Drexel during the Spring '12 term at Bloomsburg.

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Lecture-13 - Lecture #13 Todays Lecture Objectives Review...

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