VPN access problems

I've managed to set up a w2k3 computer to act as a RRAS server with NAT, DHCP, DNS and with only 1 NIC

The office setup is as follows.

(192.168.0.2) adsl/router ------switching hub-------- (192.168.0.1) RRAS, NAT, DHCP, DNS, AD
                                             |-----------------(192.168.0.x) office clients.


The router is configured to forward all VPN connections coming in on a certain port to the RRAS server. Im assuming this is what the mannual (Netgear DG834) means when it says vpn-passthru

My home setup is as follows.

(192.168.0.1) adsl/router [acting as dhcp for lan] --------------------- (192.168.04) client PC (xp)

Now, i can connect to the VPN server from the client ok, however when the client connects i get a subnet mask of 255.255.255.255 which surly means that i can never access any other ip address through that connection.

If im sitting at the RRAS server and the home client connects i can ping the client and connect to there network resources but the client can not connect to the office resources. is this because of the subnet mask?

Is it because i have the client machine connected to an dsl/router?

I dont know what to do, everyone one is saying that 255.255.255.255 is normal, but i cant see how you would ever be able to ping another address with a mask like that.

Please help as its driving me mad

Thanks.
S.