We are testing a failover of services for a number of servers. One of those portions is bringing up our Lotus Notes server at a remote office. In our main branch office we have our mail server as 10.0.0.120 and when it comes up in our transatlantic remote office it is on a different IP scheme (10.1.7.120). The failover is fine and all services work however, the DNS A record does not update for the domain (even if you do a /flushdns /registerdns manually from the 10.1.7.120 server (which has not taken the same hostname).
The strange thing is that there is even a active DC (GC/DNS/DHCP) at the remote office (10.1.7.2).
The only way we've gotten this to work is to manually go into DNS management and update the A and PTR record manually.