{
    "mode": "man",
    "parameter": "icmpinfo",
    "section": "8",
    "url": "https://www.chedong.com/phpMan.php/man/icmpinfo/8/json",
    "generated": "2026-06-02T22:31:48Z",
    "synopsis": "icmpinfo [-v[v[v]]] [-n] [-p] [-s] [-l] [-k]",
    "sections": {
        "NAME": {
            "content": "icmpinfo - interpret ICMP messages\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "icmpinfo [-v[v[v]]] [-n] [-p] [-s] [-l] [-k]\n\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Icmpinfo  is a tool for looking at the ICMP messages received on the running host.  It can be\nused to detect and record 'bombs' as well as various network problems.\n\nThe output format is as follows (all on one line):\n\nMMM DD HH:MM:SS ICMPtype[sub-type]\n< senderip [sendername] > unreachip [unreachname]\nsp=sourceport dp=destport seq=sequence sz=packetsize\n\nIn normal operation, icmpinfo will only report on \"weird\" packets, mainly icmpunreachable.\n\n",
            "subsections": []
        },
        "OPTIONS": {
            "content": "-v     Give information about all icmp packets, excepts pings.\n\n\n-vv    Give about pings too (i.e. icmpechoreply).\n\n\n-vvv   Include an ascii/hex dump of each packet\n\n\n-n     Avoid name queries - just give IP addresses.  (use this option when running unattended\non name server hosts (to avoid possible looping))\n\n\n-p     Avoid port number to service name decoding.\n\n\n-s     Show  the  interface ip that received the packet. Useful only if your host has several\nnetwork interfaces. In this case an '- myip [myname]' is added  between  the  sender\nand unreach ip and name fields.\n\n\n-l     Forks  and  use the syslog(3) facility to record events (recommended use).  (root only\noption).\n\n\n-k     Kills the background process started with the -l option.\n\n",
            "subsections": []
        },
        "WARNINGS": {
            "content": "The packet decoding is planned for ICMP Unreachable outputs and might not be significant  for\nall other Icmp types. Output can be shorter when implied by the packet size or the icmp type.\n\n",
            "subsections": []
        },
        "AUTHOR": {
            "content": "Laurent Demailly <dl@hplyot.obspm.fr>. Free software.\n\n\n\ndl's free utilities                    V1.11 - 28 August 1995                            ICMPINFO(8)",
            "subsections": []
        }
    },
    "summary": "icmpinfo - interpret ICMP messages",
    "flags": [],
    "examples": [],
    "see_also": []
}