Setting up a static IP address on your Windows 2008 R2 core server

1. Open the command prompt, type netsh interface ipv4 show interfaces to get the Idx value
2. Then at the command prompt, type:
   netsh interface ipv4 set address name="<ID>" source=static address=<StaticIP> mask=<SubnetMask> gateway=<DefaultGateway>
3. To setup DNS use the command: netsh interface ipv4 add dnsserver name="<ID>" address=<DNSIP>index=1

http://technet.microsoft.com/en-us/library/ee441257(v=ws.10).aspx