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davids355 asked on

how to configure our server to use a public ip

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??


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8/22/2022 - Mon

You can do just what you've been doing in the past. Give your exchange server a private address in the same subnet as all your other servers, but forward tcp/25 to your exchange server at your router.

If you really want to put your exchange server on a public IP, you'll need to have a router between the public ips and the private ones. You might be able to get away with entering static routes on your NAT router, but it depends on the setup.

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got it working now.

Spoke to BT they advised with this particular router the only way to do it is with two network cards.
Gave the server two network cards - one public one private.

Although the server has public IP the router still filters all traffice to it except for the smtp port which I have opened. So hopefully will be ok.
Your help has saved me hundreds of hours of internet surfing.