# icmpinfo(8) - man - phpman

[ICMPINFO(8)](https://www.chedong.com/phpMan.php/man/ICMPINFO/8/markdown)                            System Manager's Manual                           [ICMPINFO(8)](https://www.chedong.com/phpMan.php/man/ICMPINFO/8/markdown)



## 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)](https://www.chedong.com/phpMan.php/man/syslog/3/markdown) 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)](https://www.chedong.com/phpMan.php/man/ICMPINFO/8/markdown)