Wireshark-bugs: [Wireshark-bugs] [Bug 10303] New: window scaling is used even though the server

Date: Wed, 23 Jul 2014 15:16:19 +0000
Bug ID 10303
Summary window scaling is used even though the server does not support it
Classification Unclassified
Product Wireshark
Version 1.12.0
Hardware x86
OS All
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee [email protected]
Reporter [email protected]

Created attachment 12920 [details]
pcap with window full

Build Information:
Version 1.12.0rc3 (v1.12.0rc3-0-ge14d5b6 from master-1.12)

Copyright 1998-2014 Gerald Combs <[email protected]> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) with GTK+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, without Python, with GnuTLS 3.1.22, with Gcrypt 1.6.0,
without Kerberos, with GeoIP, with PortAudio V19-devel (built Jul 22 2014),
with
AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.1.22, Gcrypt 1.6.0, without AirPcap.
       Intel(R) Core(TM) i5-3320M CPU @ 2.60GHz, with 16257MB of physical
memory.


Built using Microsoft Visual C++ 10.0 build 40219
--
Window scaling is used even though the server did not include it in the options

#1 Client SYN:
Options: (20 bytes), Maximum segment size, SACK permitted, Timestamps,
No-Operation (NOP), Window scale
Window scale: 2 (multiply by 4)

#2 Server SYN+ACK:
Options: (4 bytes), Maximum segment size

#3 Client ACK:
Window size value: 5840
Calculated window size: 23360

#5 Server ACK:
Window size value: 8190
Calculated window size: 8190

#174 Client ACK:
Window size value: 65535
Calculated window size: 262140

#216 Server sent a bunch of packets
Bytes in flight: 65535

At that moment we should see window full next to this packet but we don't.
However wireshark 1.10.8 does show it:
#196 
The transmission window is now completely full

Attached is the pcap of the traffic

regards
Rafal Weglarz


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