https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5548
--- Comment #4 from Chris Maynard <christopher.maynard@xxxxxxxxx> 2011-01-05 09:11:03 PST ---
(In reply to comment #3)
> Yes, it's a valid ACK, but doesn't an out-of-order packet occur when a packet
> is seen with a sequence number lower than the previously sequence number on
> that connection direction, like packet #10?
Not for ACK's, or more accurately, as you suspected, not for any packet where
the segment length is zero. From packet-tcp.c:tcp_analyze_sequence_number(),
starting at line 953:
if( seglen>0
&& tcpd->fwd->nextseq
&& (LT_SEQ(seq, tcpd->fwd->nextseq)) ){
...
/* out of order determination code */
...
}
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