PPTP VPN client can make connection but can't see network resources

Hi,

I am trying to setup a VPN between my home and the office and can only
get it partially working.

Office
-------
* Small network connected to the internet by a Draytek router (Draytek
2600).
* Draytek router has an inbuilt VPN server which is setup and running.

Home
-----
* Win98 Box. Have installed VPN client and can successfully attach to
the Draytek routers VPN server across the intenet and get access to
all the office network resources. This was very simple to do and
works fine.

* SUSE Linux box. Have installed pptp and can establish a connection
to the Draytek routers VPN server over the internet but can't get
access to any of the office network resources. Can succesfully ping
the Draytek over the VPN connection on 192.168.1.1 but can't ping any
other computer on the office network.

* At home my Win98 box and SUSE Linux box are connected to the
Internet through a Dlink router with VPN passthrough enabled.

Can anyone shed any light on why I can connect to the Draytek VPN
server on my Linux Box but can't see or ping any of the computers
hanging off it. Win98 VPN client does it fine so all the hardware
side seems to be able to communicate ok.

Thanks in advance for any suggestions.

JP