Answer for:

Server 2003 DHCP within a router

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Are you trying to get Internet traffic flowing through the server then out through the router, or do you simply want machines that get an IP address from the server to have Internet access?

You want to avoid having two different DHCP servers on your network. The normal way of doing this is to disable the DHCP server role on the router. Now open the DHCP snap-in on the server. Right-click 'Scope Options' for the scope you have defined, and click 'Configure Options'. Tick 'Router' and add the IP address of your router. Also tick 'DNS Servers'. Add the IP of the server if you're using it for DNS, otherwise enter the IP of your router (or a public DNS server like if you prefer). Click OK and refresh the IPs on your client PCs. They will now be given the routers IP as their default gateway, and whichever DNS server(s) you chose.