Static Routes assigned by DHCP

This may be a relatively simple question.

I have a Win2k server running DHCP for 2 subnets and another subnet that has static IP range assigned.

I have a WinXP client in one of the DHCP subnets which is connected directly to the server, and another client (WinXP) connected via a hub on the other subnet.

Without a static route the clients cannot see each other. Both can see the relevant NIC on the server. Of course this is expected though.

The problem is this: The subnet mask I have chosen for my own reasons is 255.255.255.224. DHCP on Win2k can assign static routes (option 033), but uses the 255.255.255.255 subnet mask which doesn’t work. Does anyone know how to change the subnet mask to a custom mask?