In my office, I had to setup new box with the following:
Dell 990, Core i5 CPU, 4 GB RAM, 500 GB Hard Disk, 2 NICs
NIC1 - Connected with D-Link gigabit switch - 30 Users NIC2 - Connected with ADSL Modem/Router
Windows Server 2008 R2
ADDS, DNS, DHCP
Users will get their IP, subnet, DNS, default gateway from the server. Users will be using internet through this server.
How to achieve this?