7 ping: Packets to network hosts

ping uses ICMP datagrams to provoke a response from the chosen destination host, mainly intending to probe whether it is alive.

The used datagram, of type ECHO_REQUEST, contains some header information and some additional payload, usually a time stamp. By a suitable choice of payload, different host or router properties are detectable, as the emitted datagram travels to its destination.

Synopsis:

ping [option…] host

Sending echo requests is the standard use of ping, but by far not the only use case.

• Command line options
• Using ping for network fault isolation
• Duplicate and damaged packets
• Trying different data patterns
• TTL details
• Further observations