in our organisation we have server 2003 running as domain controller and have just installed another box running server 2003 with exchange 2003, install went fine but now obviously we need to set up a public ip address for the exchange server.
In the past I have used ISPs with fixed ip address and all I had to do was note the public ip then forward port 25 (smtp) to the servers local ip via the router (then change the mx record to the fixed wan ip address).
However in this setup we have been given 5 public ips by BT. And basically tey are set up through the bt router and in conjunction with dhcp - from what I understand you set the server to pick up its address via dhcp, then you map the server (via the router) to one of the public ips) and it then updates the server via dhcp.
However this seems to cause a problem because the public ip is in a different subnet to the rest of our network - so when the server picks up its public ip, it can no longer contact any other computers on the lan - including most importantly, the domain controller.
How do I get round this? Do I need to have two network adaptors on the exchange server - one for lan and one for wan??