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From: Ian Melven (imelvenxtremesoft.com)
Date: Thu Nov 01 2001 - 13:56:49 CST

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    Hi everyone

    A question on portscans.. I've been scanned for SubSeven
    a few times.. I set up a rule to track outgoing packets
    from the default port (27374) with the ACK flag set..

    this caught 2 machines sending RST|ACK packets in response
    to a SYN...

    Can someone explain why these are sending RST|ACK instead
    of just a RST ? I thought RST was the standard response to a
    SYN from a closed port ? Is this because the initial incoming
    SYN had some data in it (I believe this is allowed...)

    I need to get an office copy of TCP/IP Illustrated :/

    thanks !
    Ian

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