man > icmpinfo(8)

ICMPINFO(8)                            System Manager's Manual                           ICMPINFO(8)

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 AT hplyot.fr>. Free software.

dl's free utilities                    V1.11 - 28 August 1995                            ICMPINFO(8)