Ethereal-users: [Ethereal-users] Window scaling and relative sequence numbers

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From: Markus Rehbach <markus.rehbach@xxxxxx>
Date: Thu, 29 Jul 2004 11:35:52 +0200
Hi all,

there seems to be a problem in 0.10.5 and probably older ones. 

If preference is 'tcp.relative_sequence_numbers: TRUE' there is a wrong 
value shown for the window size (3rd line below: Win=747520 should be 5840).

  0.070763 a -> b TCP 32985 > imap [SYN] Seq=0 Ack=0 Win=5840 Len=0 MSS=1460 TSV=3609664 TSER=0 WS=7
  0.071129 b -> a TCP imap > 32985 [SYN, ACK] Seq=0 Ack=1 Win=5840 Len=0 MSS=1460
  0.071176 a -> b TCP 32985 > imap [ACK] Seq=1 Ack=1 Win=747520 Len=0

If preference is 'tcp.relative_sequence_numbers: FALSE' it looks good. 

  0.076386 a -> b TCP 32991 > imap [SYN] Seq=4090487846 Ack=0 Win=5840 Len=0 MSS=1460 TSV=4006974 TSER=0 WS=7
  0.076748 b -> a TCP imap > 32991 [SYN, ACK] Seq=3661596958 Ack=4090487847 Win=5840 Len=0 MSS=1460
  0.076798 a -> b TCP 32991 > imap [ACK] Seq=4090487847 Ack=3661596959 Win=5840 Len=0

Problem shows up in ethereal and tethereal (no surprise;-).

Markus