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Duplicated UDP stream IDs?

asked 2022-12-14 14:38:44 +0000

Hi All,

Could you please tell why I see duplicate stream IDs in Conversations dialog:

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These streams have even different IPs and ports. If I filter by this stream ID, I get both streams. Strangely enough, when I set "Assume packets have FCS to "Always"", streams are not duplicated anymore (this PCAP does NOT have FCS included).


Wireshark version:

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Thanks for any hint!


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Can you share the profile? Are there any Packets B -> A?

Chuckc gravatar imageChuckc ( 2022-12-14 15:26:01 +0000 )edit

Hi Chuck,

1) It's just default profile + Stream ID column added:

2) I see that one stream is separated to 2 unidirectional IDs? See for example ID 9 + ID 10, same 5-tuple if I'm not missing something.

Packet_vlad gravatar imagePacket_vlad ( 2022-12-14 16:46:53 +0000 )edit

I was unable to recreate but my "Default" profile looks a lot like my desk - messy.
Will create a clean profile and try again. :-)
Yes - I was guessing but adding up the packet counts I could see in your screen shot resulted in the totals I was seeing here.

Chuckc gravatar imageChuckc ( 2022-12-14 16:55:08 +0000 )edit

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answered 2022-12-18 00:27:31 +0000

Chuckc gravatar image

When h225 protocol is enabled, the conversation tables are different.
There was something similar with SNMP (9123: SNMP/UDP: SNMP is walking on UDP conversation/stream ID).
If I don't find a fix soon, will open an issue to track this and post a link to it here.

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Asked: 2022-12-14 14:38:44 +0000

Seen: 139 times

Last updated: Dec 18 '22