icmpinfo

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.
              Usefull 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 (recomended use).  (root only option).


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

WARNINGS

       The  packet  decoding is planned for ICMP Unreachable out-
       puts 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.