At the moment, I am using the exact mux driver from the Windows Server
2003 DDK Service Pack 1.
I built the driver in checked mode and installed it on two machines with
almost the same hardware. I put the intermediate drivers on separate
VLANs and tried pinging them back and forth, and the pings still go
through. The base miniport driver for the NIC has TCP/IP disabled so I
can assume that the ping requests are accurately going through the
intermediate driver. What could be the problem?