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I am only seeing BACnet traffice on Port 47808, how do I see BACnet traffic on Ports 47809, 47810, 47811 and 47812?

asked 2020-01-27 20:19:01 +0000

Laswell gravatar image

updated 2020-01-27 21:51:31 +0000

Guy Harris gravatar image

I have a system with 5 BACnet IP to MSTP routers and am trying to identify my communication issues. Wireshark only seems to be picking up traffic on port 47808, but the other four routers are not getting picked up. Any assistance would be helpful.

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answered 2020-01-27 21:37:17 +0000

Chuckc gravatar image

updated 2020-01-27 21:37:40 +0000

Analyze -> Decode As...

Add rules to decode the non-standard UDP ports as BVLC.
The wiki mentions non-default ports but probably could use a reference to Decode As...

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I.e., "Wireshark isn't picking up traffic for protocol X on ports Y, Z, and W" or "I'm not seeing traffic for protocol X on ports Y, Z, and W" usually means "Wireshark is picking up traffic on ports Y, Z, and W, but it's not recognizing it as protocol X". Sometimes that means you have to tell Wireshark that the traffic on those ports is also protocol X traffic, in the fashion that bubbasnmp says.

Guy Harris gravatar imageGuy Harris ( 2020-01-27 21:51:18 +0000 )edit

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Asked: 2020-01-27 20:19:01 +0000

Seen: 251 times

Last updated: Jan 27 '20