Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 8293] New: OSIT: Incorrect TP4 checksum calculation (ATN extended checksum) in

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Bug ID	8293
Summary	OSIT: Incorrect TP4 checksum calculation (ATN extended checksum) in case of multiple TPDU's per frame
Classification	Unclassified
Product	Wireshark
Version	SVN
Hardware	All
OS	All
Status	UNCONFIRMED
Severity	Enhancement
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	guettler@web.de

Created attachment 9925 [details]
Tracefile with multiple TPDU's (AK,DT) per frame #402 #423 etc.

Build Information:

--
It was found that the ositp disscetor is able to cope with the situation when
multiple transport TPDU's (i.e. AK followed by DT) are contained within one
NPDU.

The ATN extended checksum however is not correctly calculated in that case;
both checksums were displayed as incorrect although beeing ok.

The added pcap dump containes several example frames ( i.e. frame #402 #423)
which illustrate the problem

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