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ICMPINFO(1)            DragonFly General Commands Manual           ICMPINFO(1)

NAME
       icmpinfo - interpret ICMP messages

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

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).

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.

dl's free utilities         V1.11 - 17 August 1995                 ICMPINFO(1)