[Ns-bugs] [Bug 499] wireshark complains if ack number is nonzero but ACK flag not set

Tue Feb 17 02:35:04 PST 2009

http://www.nsnam.org/bugzilla/show_bug.cgi?id=499

--- Comment #4 from Gustavo J. A. M. Carneiro <gjcarneiro at gmail.com>  2009-02-17 05:35:04 EDT ---
>From http://www.faqs.org/rfcs/rfc793.html

  Acknowledgment Number:  32 bits

    If the ACK control bit is set this field contains the value of the
    next sequence number the sender of the segment is expecting to
    receive.  Once a connection is established this is always sent.

It says nothing about the ack number having to be zero, and it says the ack
number should always be sent after connection established.  So I think you are
right, Tom.

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