The latest code in CVS now supports Multicast DNS, which is marketed by Apple as Rendezvous. This means that anyone in a local network can automatically discover the server name and port that Jive Messenger is running on. Because no clients support this protocol yet, it’'s mainly useful for writing custom applications. For anyone interested in playing with this functionality, you may want to try the JMDNS project: http://sourceforge.net/projects/jmdns/
Jive Messenger will publish with the type “_xmpp._tcp.local.”.
If this feature turns out to be useful to a lot of people, perhaps we can submit it as a JEP. Note: this is different than what iChat does. In iChat, multicast DNS is used for peer to peer messagin. Jive Messenger’'s usage of the service is just to auto-discover the location of a normal XMPP server.