Wireshark-bugs: [Wireshark-bugs] [Bug 10933] "Decode as" don't work well for modbus

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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 06 Feb 2015 18:09:48 +0000

changed bug 10933


What Removed Added
Status UNCONFIRMED CONFIRMED
CC   [email protected]
Ever confirmed   1

Comment # 4 on bug 10933 from 
Assuming the SYN/ACK of the underlying TCP stream is captured, is there a way
to do this with "conversation data"?

The problem (as the comments in the dissector state) is that there isn't enough
information in the packet itself to determine request/response (Modbus is a
very simple protocol), so the dissector is trying to determine it with
source/destination port which won't be reliable if you don't use the standard
(or preferenced) port.

"Decode As" doesn't really provide any data to help clarify that.

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