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Jo,
Both ends of the tcp connection need to support
Window scaling for it to be used:
"This option is an offer, not a promise; both sides
must send Window Scale options in their SYN segments to enable window scaling in
either direction."
In your trace, host 63.245.209.93 does not
support Window scaling, as the SYN/ACK that it sends does not have the window
scaling option. Therfore no window scaling will be used and Wireshark displays
non-scaled values.
Hope this helps,
Cheers,
Sake
----- Original Message -----
Sent: Monday, March 23, 2009 11:58
AM
Subject: Re: [Wireshark-users] TCP:
window scaling
Hi
Sake,
Here you go: http://denuitlaat.be/tcp/windowscaled1.pcap
.
It shows that a session is started with a SYN and the option ws is
present (ws = 2). The segments following do not show a scaled window
size.
Regards,
jo
From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Sake Blok
Sent: maandag 23 maart 2009
11:40
To: Community support
list for Wireshark
Subject:
Re: [Wireshark-users] TCP: window scaling
The window size should
consistently be displayed within one TCP session. Between sessions, there
could be difference, because either there is no scaling, or the SYN, SYN/ACK
were not present in the tracefile. If that does not explain the differences
you see, could you provide a small capture showing this issue?
----- Original Message -----
Sent: Monday,
March 23, 2009 11:03 AM
Subject:
[Wireshark-users] TCP: window scaling
Hi,
Is there a reason why sometimes
in a connection which received a window scaler (syn;syn,ack) , the window
size is
shown as number (scaled) and
sometimes just as number (non scaled) in the next segments. Cause in the
last case its not
possible to know the exact
window size as the window scale factor is non present in the segments after
the syn; syn,ack.
Kind regards,
Jo
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