I have a current windows 2003 AD DNS server on 10.2.1.x
We are bringing up new Windows 2008 R2 AD DNS servers on 10.10.55
I have alot of apps that possibly are hardcoded for 10.2.1.x, so I want to be able to have my new DNS server serve them as well. The server has 2 NIC's but last time I tired to have 2 seperate nics on 2 different subnets with 2 different gateways things did not go so well. Can anyone help me think outside the box? We dont currently have any Layer 3 switches in place, so NATing isnt that easy.
If DCs, then you can get trouble with multiple NICs but these can be sorted by altering the binding priorities. If they are not DCs, then dual homing DNS servers should work but you should NOT have multiple default gateways - just one for when that server needs to get at networks other than the two they are on (10.2.1.0 and 10.10.55.0)
If these servers are both in the same AD forest, then replication will happen automatically. Otherwise they will need configuration to replicate. Are you comfortable about this?