Incorrect subnet mask for dhcp clients

I have setup vpn on a 2000 server box for our remote clients. The only problem im having is when a client connects it receives the wrong subnet mask. We use a 255.255.0.0 there getting 255.0.0.0. We run dhcp on a NT 4.0 box. Our LAN clients receive the correct mask, but not our remote clients. All the settings are correct on the dhcp server. Has anybody seen this happen? Please help getting frustated. Need to have the vpn server up and running soon, thanks who help.