Multiple NICS not working in Server 2008 guest

[allennix]

Guest - Windows 7, VBox 3.2.8, Guest - Multiple Server 2008
I am using two virtual nics in each S08. One is a NAT, the other is Internal. The internal nics randomly or never communicate as long as the NAT is enabled in the VMM window. If I disable the NAT, the internal nics start communicating. The internal nics are configured with static IP information. This problem is occurring on multiple hosts.

I need both. Any ideas on what the problem could be? Besides disabling the NAT, I have tried:

reinstalling the guest editions
disconnecting the cable (software)
uninstalling the NIC in S08 and reinstalling
stopping and starting the network service in S08
disabling the NIC in S08
restarting the guests and VBox
restarting the host
changing from internal to host only and to another NAT

I appreciate any help

[BillG]

If the vms can communicate when the NAT NIC is disabled, your internal network is fine. What exactly are you trying to achieve with the second NIC connected to NAT in each machine?

Windows servers does not really like being connected to two different networks. It plays havoc with the name resolution (DNS or Netbios names). The normal way to connect two networks is to set up an IP router between them, not give the machines a NIC in each network. All vms would have just one NIC except the router.

[allennix]

Thanks - don't know what I was thinking. As soon as I read your comment, I realized I was multihoming a DC. Having a brain burn moment