Wireshark-bugs: [Wireshark-bugs] [Bug 6164] New: RTT is still computed even if no ACK flag is se

Date: Mon, 25 Jul 2011 11:34:11 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6164

           Summary: RTT is still computed even if no ACK flag is set
           Product: Wireshark
           Version: 1.6.0
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: g.borello@xxxxxxxxx


Build Information:
Version 1.6.0 (SVN Rev 37592 from /trunk-1.6)

Copyright 1998-2011 Gerald Combs <gerald@xxxxxxxxxxxxx> 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+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, without
SMI, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3, with
Gcrypt 1.4.6, without Kerberos, with GeoIP, with PortAudio V19-devel (built Jun 
7 2011), with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.2 (packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 2.10.3, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
I ran into a trace containing a RST packet with no ACK flag (but still a
non-zero ACK number).

In the "Acknowledgment number field", Wireshark says "Broken TCP", but it still
computes the RTT (SEQ/ACK analysis field).

I'm attaching part of that trace.

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