VPN changes NetBIOS name

Every time I VPN into work using the built in client my iMac's NetBios name gets changed. To VPN-## The name I gave it still exists under System Prefs -> Network ->Eithernet ->Adavanced -> WINS but there's a not to the side that says "VPN-## is currently being used" and the Windows box sees "VPN-##" not the name I gave it. A restart seems to fix the problem but as soon as I VPN in it happens again. As a side note the prompt in my bash shell also changes from MyName: to vpn-##: although System Prefs -> Sharing still has the computer name set to MyName
Thanks for any help.

The term "netbios" is normally associated with Windows computers.  Where on a Mac do you see anything described as a "netbios name"?
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