NAT Server Help

teammatt3's picture

He has: 2,102 posts

Joined: Sep 2003

Sorry, this is a little vague, but I don't really know what I'm doing.

We have a NAT server that does something for us. For one reason or another, the NAT server needs to be moved over to another machine. Luckily, Windows Server 2003 makes it easy to setup an NAT server even if you have no idea what you're doing (like me!). The problem is whenever someone tries to get connected to the internet, the NIC settings are still pointing at the old NAT server (the default gateway is still the old NAT server's IP). I can manually change the default gateway and all that crap and the internet will work, but I don't want to have to do that. I unplugged the old NAT server, and still, the NIC points to the non existent NAT server.

I don't really know what I need help with, but I could use some ideas.

pr0gr4mm3r's picture

He has: 1,502 posts

Joined: Sep 2006

The NAT server is what is allowing your network to connect to the Internet. Basically, it acts as a bridge between your private network and the worldwide network (aka The Internet). If you haven't already, reading up on it here may help.

For your specific problem, it sounds like it's a problem with your DHCP server and not the NAT server. When your DHCP client (client computer) gets an IP address from the DHCP server, it also gets the default gateway's IP address. If you change that setting on your DHCP server, then that change will propagate to all your clients on the next renew.

I'm not a Windows server expert either, but I'm pretty sure that the setting is changed by firing up the DHCP server config, going to the 'scope' for your network, and changing the IP address for the '003 Router' option. If that option is not there, right-click on the Scope Options folder, and click on 'Configure Options'. Find that option under the Available Options section and check the respective box.

teammatt3's picture

He has: 2,102 posts

Joined: Sep 2003

Aha! That looks like it might work. I'll have to try it tonight when everyone at the office is gone.

Thanks!

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