Re: to capture illegal TCP flags

From: Casper H.S. Dik (Casper.Dik_at_Sun.COM)
Date: 01/14/04

  • Next message: Steve Horsley: "Re: to capture illegal TCP flags" 
    Date: 14 Jan 2004 20:17:49 GMT

    yosponge@yahoo.com (sponge) writes:

    >'Illegal TCP flags' may refer either to reserved flags being set in
    >the TCP flag portion of a TCP header (older OS' and firewalls may not
    >recognize ECN, for instance), or a combination considered invalid by
    >the TCP stack (e.g. FIN/URG).

    Why is FIN/URG invalid? Since you can send data with the FIN,
    I'd imagine that data could be urgent.

    Casper 

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