https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=14697
Bug ID: 14697
Summary: CAPWAP internal DSCP is correctly shown in the packet
detail but referenced as the external DSCP
(ip.dsfield.dscp)
Product: Wireshark
Version: 2.4.6
Hardware: x86-64
OS: Windows 10
Status: UNCONFIRMED
Severity: Minor
Priority: Low
Component: Dissection engine (libwireshark)
Assignee: bugzilla-ad...@wireshark.org
Reporter: utente.ex...@tiscali.it
Target Milestone: ---
Created attachment 16340
--> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=16340&action=edit
A Cisco Lighweight Access Point CAPWAP IP packet (that contains another ip
packet)
Build Information:
Version 2.6.0 (v2.6.0-0-gc7239f02)
Copyright 1998-2018 Gerald Combs <ger...@wireshark.org> and contributors.
License GPLv2+: GNU GPL version 2 or later
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html> 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 (32-bit) with Qt lacuna5.9.4, with WinPcap (4_1_3), with GLib 2.38.0,
with zlib 1.2.11, with SMI 0.4.8, with c-ares 1.14.0, with Lua 5.2.4, with
GnuTLS 3.4.11, with Gcrypt 1.7.6, with MIT Kerberos, with MaxMind DB resolver,
with nghttp2 1.14.0, with LZ4, with Snappy, with libxml2 2.9.4, with
QtMultimedia, with AirPcap, with SBC, with SpanDSP, with bcg729.
Running on 64-bit Windows 10, build 16299, with Intel(R) Core(TM) i5-7200U CPU
@ 2.50GHz (with SSE4.2), with 12157 MB of physical memory, with locale
English_United Kingdom.1252, with WinPcap version 4.1.3 (packet.dll version
4.1.0.2980), based on libpcap version 1.0 branch 1_0_rel0b (20091008), with
GnuTLS 3.4.11, with Gcrypt 1.7.6, with AirPcap 4.1.0 build 1622, binary plugins
supported (14 loaded). Built using Microsoft Visual C++ 14.12 build 25835
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
A CAPWAP packet has its own IP header and moreover it transports (encapsulated)
another IP packet.
If the CAPWAP dissection is enabled, from the packet details window you can see
the two IP packets and the specific DSCP code of each one.
In the attached packet, the external DSCP is AF21 (18) and the internal DSCP is
Unknown (4).
Anyway if you select both field to be "applied as a column" you will see that
both are referenced by the same code, that is "ip.dsfield.dscp", and so you
will have two columns with the same value.
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