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Decoding AVTP Control frames

asked 2018-02-27 20:33:00 +0000

anonymous user

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I see that AVTP control frames are not being decoded even-though cd bit in the header field is 1. Wire shark always decodes AVTP packet with ether-type = 0x22F0 and cd = 1 as AVTP data frames. Is this expected behavior in wire shark?

I am using wireshark Version: 1.12.2

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On further analysis i see that wireshark takes the subtype field of AVTP packet as 8 bits, but as per IEEE1722 spec it is 7 bits. CD bit is getting merged in to subtype field in wireshark, hence control frames are not decoded.

Note:I tried this on the latest version of wireshark:Version 2.4.5

pkn876 gravatar imagepkn876 ( 2018-02-27 23:32:58 +0000 )edit
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answered 2018-02-28 05:29:42 +0000

Guy Harris gravatar image

If the latest version of Wireshark is incorrectly dissecting AVTP frames, please file a bug on the Wireshark Bugzilla, and, if possible, attach a sample capture that shows the problem.

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Bug#14474 filed on this with the capture for AVTP control frame.

pkn876 gravatar imagepkn876 ( 2018-03-02 19:48:30 +0000 )edit
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Asked: 2018-02-27 20:33:00 +0000

Seen: 768 times

Last updated: Feb 28 '18