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Welcome, I have got tcpdump 3.9.5-2ubuntu1 and I would like to use -K option. Unfortunately it is not supported. Do I need install additional packets? Is my version to old? ...
  1. 10-27-2007 #1
    gandalf29
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    tcpdump -K not working

    Welcome,

    I have got tcpdump 3.9.5-2ubuntu1 and I would like to use -K option.
    Unfortunately it is not supported. Do I need install additional packets?
    Is my version to old?

    Regards,
    Christopher
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  2. 10-27-2007 #2
    anomie
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    There is no -K option on my FreeBSD box or my CentOS box either. Where have you used it before, and what does it do?
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  3. 10-28-2007 #3
    gandalf29
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    I have found it on following website: Manpage of TCPDUMP

    This the description:
    -K
    Don't attempt to verify TCP checksums. This is useful for interfaces that perform the TCP checksum calculation in hardware; otherwise, all outgoing TCP checksums will be flagged as bad.

    Greetings,
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