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Unable to dissect ACN

asked 2023-03-06 13:31:30 +0000

MartinC gravatar image

I am unable to get ACN dissection to work on a new Wireshark install on a new PC. I have another installation on another PC which works as expected. Even using the same capture file and the same configuration dissection works on one machine, but not the other. The packets are there, but only displayed as UDP. I'm begining to think the dissector hasn't installed properly. Where should it be on a Windows machine please? C:\Program Files\Wireshark\plugins\4.0\epan ?? And what is the filename for the ACN disector? I only have 12 dlls there and none of them describe themselves as ACN dissector. Thank you in advance, Martin

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answered 2023-03-06 14:01:44 +0000

Jaap gravatar image

Go into Analyze | Enabled Protocols and search for ACN. Make sure 'acn' is enabled.

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Yes, ACN is enabled there. In fact, all protocols are enabled. Also streaming DMX is enabled in preferences>protocols>ACN. As I say, it is working perfectly on my other machine with the exact same settings.

MartinC gravatar imageMartinC ( 2023-03-06 14:34:35 +0000 )edit

packet-acn.c:

  heur_dissector_add("udp", dissect_acn_heur, "ACN over UDP", "acn", proto_acn, HEURISTIC_DISABLE);
  heur_dissector_add("udp", dissect_rdmnet_over_udp_heur, "RDMnet over UDP (LLRP)", "rdmnet_udp", proto_acn, HEURISTIC_DISABLE);
  heur_dissector_add("tcp", dissect_rdmnet_over_tcp_heur, "RDMnet over TCP (Broker, RPT, EPT)", "rdmnet_tcp", proto_acn, HEURISTIC_DISABLE);

The protocol ACN is enabled but the heuristic dissectors are disabled by default. Expand the ACN entry and verify acn ACN over UDP is enabled.

Chuckc gravatar imageChuckc ( 2023-03-06 15:16:26 +0000 )edit

Yes ACN over UDP is enabled.

MartinC gravatar imageMartinC ( 2023-03-06 15:28:54 +0000 )edit

There is a sample file on the Wireshark wiki. Does it dissect as ACN?

Chuckc gravatar imageChuckc ( 2023-03-06 15:40:15 +0000 )edit

What Wireshark version are you running on 'the other machine' and on this one? (FYI: the ACN dissector is build in, so there's nothing to look for in a plugins directory.)

Jaap gravatar imageJaap ( 2023-03-06 15:42:25 +0000 )edit

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Asked: 2023-03-06 13:31:30 +0000

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Last updated: Mar 06 '23