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I would like to add a second NIC to a Windows Server 2003 VM so that it will have two NICs which each have a different public IP.

How do I go about assigning the NICs to different public IPs?

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Directions for adding the NIC would require knowing what virtualization technology you're using. – Chris S Aug 2 '10 at 19:53
Are you trying to use a 2nd external network? Is this for performance? Does it have to be a 2nd NIC or could you just add a 2nd IP to the current NIC? – Clint Aug 2 '10 at 20:04
up vote 1 down vote accepted
  1. Shut down the VM.
  2. In VMware, Hyper-V, VirtualBox, Xen, or whichever hypervisor you happen to be using, edit the VM settings. Add a second network adapter. Assign it to the appropriate physical interface. Because you want it to have a public IP, be sure to use Bridged mode (not NAT or host-only).
  3. Start the VM.
  4. Log in as an administrator.
  5. Start->Run->ncpa.cpl, right-click the new network adapter, click Properties, select TCP/IP, click Properties, assign an IP address.
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Once the NIC is installed, you should be able to give it a static IP like normal through the NIC's TCP/IP settings in control panel.

I am not completely sure if this is what you are asking, maybe clarify?

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I think I just need to setup the NICs so they connect to separate gateways. – user49032 Aug 2 '10 at 19:21

If it's a VM, you shouldn't need to create a seperate NIC, you can just add a second IP and gateway to the virtual NIC you have installed through Windows Control Panel.

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