my SME 7.2 is in server gateway mode, with DHCP on
Clients are configured to use DHCP settings on the VPN connection.
This is not configured on the network connection, but the vpn connection.
Clients can even join the domain if connected with VPN, and can use their own login, to connect to other shares on computers in the domain.
Another SME server 6. is configured with static IP and is not providing netbiosnames.
I'm using lmhost in Windows/System32/drivers/etc then.
Clients need to connect using IP adresses to access computershares on the network, if not added to the lmhost file.
So first create VPN connection, make no changes or whatever to the connection, login with VPN, leave DOMAIN blank. Then add your computer to the domain if you wish.
Your VPNclient is now just like a normal client on the network.