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.