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 loop-
	      ing))

       -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.

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