Ping and Traceroute

• Ping: Used to test

  • destination reachability,
  • compute round trip time
  • count the # of hops to destination
  • may provide record route option. Sample output:

Reply from 164.107.144.3: 48 bytes in 47 msec. TTL: 253

• Traceroute: Exploit TTL and ICMP

  • Send the packet with time-to-live = 1 (hop)
  • The first router discards the packet and sends an ICMP “time-to-live exceeded message”
  • Send the packet with time-to-live = 2 (hops) etc…
  • Does not use optional features like record route

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