Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 1545] Improperly decodes BACnet foreign device registration.

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http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1545





------- Comment #9 from jaap.keuter@xxxxxxxxx  2007-05-10 06:02 GMT -------
/* Taken from add-135a (BACnet-IP-standard paper):
 *
 * The default UDP port for both directed messages and broadcasts shall
 * be X'BAC0' and all B/IP devices shall support it. In some cases,
 * e.g., a situation where it is desirable for two groups of BACnet devices
 * to coexist independently on the same IP subnet, the UDP port may be
 * configured locally to a different value without it being considered
 * a violation of this protocol.
 */

In this case the non standard UDP port 47899 is used. To get it decoded as
BACnet packets choose 'decode as...' and select BVLC. 
A more permanent solution is to add a preference to the dissector, setting an
optional alternative UDP port number.


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