Migrating to new ISP
Posted on 2012-08-29
For years we have been running off a T1 and recently cable and it's much increased bandwidth have made it into the area. Our line was installed and now I need to migrate over to the new line. I have pretty much done most of the work by enabling load balancing on the server and tested that the throughput is working as it should with the new connection. I have matching rules for both WAN inbound and that is all working. However email does not accept or deliver when load balancing switches to the new circuit.
My research tells me I likely have to add an MX record for the server for the new IP, but I am only using server.domain.com and I dont have multiple A records published for this host. So do I add server2.domain.com with the new IP, add that as the new IP and thats it? And what good does server2.domain.com do me if nobody knows who that is. Do I set server2 in my local DNS table so it can translate to server.
A checklist if items would be sweet but I may not be using the right keywords when I search. Give me some terms for what I am trying to do here. I don't want to load balance 2 exchange servers, I basically want to load balance an exchange server between 2 ISPs, with the intent on dropping the original IP all together in a few weeks.
PS, I actually have 2 mail servers. One server collects mail for 2 domains and another, 1 domain. So I would be doing this for 2 boxes eventually. Also server1 is SBS2003 with exchange 2003 and the other is Server 2008 R2 with Exchange 2010 if that matters.