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ICMP Destination Unreachable warning

Discussion in 'Virus & Other Malware Removal' started by Czub, Mar 6, 2005.

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  1. Czub

    Czub Thread Starter

    Feb 22, 2005
    Just happen to read my last attack notice
    It gave a source IP address
    Destination port: N/A
    Attack type: ICMP Destination Unreachable

    There were four entries of this in 2 minutes, in my firewall log. Any ideas what this is?

  2. Elvandil


    Aug 1, 2003
    These are usually just ping entries. Some applications and sites use them just to check on the validity of connections. It's possible someone was scanning ports, but that really depends on the pattern, and more sophisticted scanners use a scattered pattern that is not so easily detected by firewalls.

    In any case, it was blocked. In some cases, you may find that you need to allow some ICMP traffic for applications to work correctly.
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