I’ve been experiencing similar problems with my Win2K clients. Using 10.3 Server Mac clients using L2TP can connect and use internal services.
Windows clients can connect but no services are available to them. After running the ipconfig command in MSDOS when connected (which authenticates and registers without a hitch over PPTP BTW) I get a curious result where the gateway has the same IP as the client with the subnet being 255.255.255.255. This, I assume is why I cannot reach any services outside of it’s own IP address. The question is how to resolve this?
Any ideas?