NAME

       icmpinfo - interpret ICMP messages

SYNOPSIS

       icmpinfo [-v[v[v]]] [-n] [-p] [-s] [-l] [-k]

DESCRIPTION

       Icmpinfo  is  a  tool  for  looking at the ICMP messages received on the running host.  It can be used to
       detect and record 'bombs' as well as various network problems.

       The output format is as follows (all on one line):

         MMM DD HH:MM:SS ICMP_type[sub-type]
            < sender_ip [sender_name] > unreach_ip [unreach_name]
            sp=source_port dp=dest_port seq=sequence sz=packet_size

       In normal operation, icmpinfo will only report on "weird" packets, mainly icmp_unreachable.

OPTIONS

       -v     Give information about all icmp packets, excepts pings.

       -vv    Give about pings too (i.e. icmp_echo_reply).

       -vvv   Include an ascii/hex dump of each packet

       -n     Avoid name queries - just give IP addresses.  (use this option when  running  unattended  on  name
              server hosts (to avoid possible looping))

       -p     Avoid port number to service name decoding.

       -s     Show  the  interface  ip  that  received  the packet. Useful only if your host has several network
              interfaces. In this case an '- my_ip [my_name]' is added between the sender  and  unreach  ip  and
              name fields.

       -l     Forks and use the syslog(3) facility to record events (recommended use).  (root only option).

       -k     Kills the background process started with the -l option.

WARNINGS

       The  packet  decoding  is planned for ICMP Unreachable outputs and might not be significant for all other
       Icmp types. Output can be shorter when implied by the packet size or the icmp type.

AUTHOR

       Laurent Demailly <dl@hplyot.obspm.fr>. Free software.