We are using the standard windows client and a TP-Link Router -which as far as I can tell doesn't have any settings that I can see that are specific to this.
I did set up WINS and set the server IP on one test machine. Although it did appear in WINS on the server I still could ping or see this in Retrospect either via the hostname or direct to the IP.
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I added the netbios server address in option 044 in DHCP for the test client, but as it's coming in via the VPN it's not even picking up the reserved IP so this reference will mean nothing?