I have 3 servers, a DC an exchange server and an apps server. If I ping the DC from any server or ping any server from the DC I get an IPv4 response, as you would expect, however if I ping exchange from apps, or the other way round the result I get is an IPv6 address.
All the NICs have IPv6 unticked so I can't understand why they are responding with these addresses, I also think this is causing problems because the Blackbery Enterprise Server I have just installed on apps cannot communicate with the Exchange server.
Any ideas how to get back to regular old IPv4?
The problem with BES resolving Exchange does seem to be an IP or DNS issue. If I use the IPv4 address of the exchange server in the BES MAPI setup it resolves that name to Exchange, and gets a connection, but then when you start BES it tries to resolve the name, and fails!