I have a physical server running 2012 R2 (replacing an older server running Server 2003), and I'm trying to use one of the NICs for a Ghost network. The old server runs to an unmanaged switch, and we connect PCs to this network to PXE boot into Ghost. However, we cannot get DHCP to run when connecting the new server to the network, and cannot even ping back and forth. We are disconnecting the cable from the old server and are using a different port on the switch, but we can't get this NIC to communicate with any other machines on the network, much less obtain an IP address. Is there something simple we're missing, i.e. firewall issue, NIC configuration, DHCP configuration, etc?