ipcop blue to green - access file share

[Roger Searle]

Hi, I have IPCop set up with blue (10.3.1.0/24), green (10.2.1.0/24), 
and red networks.  Currently a wireless XP client on blue with a fixed 
DHCP lease is connected through a D-Link DSL-G604T wireless router 
(10.3.1.1, doing DCHP relay to 10.3.1.2 - the IPCop blue NIC) and can 
browse the internet.  Default gateway of the client (from it's routing 
table) is 10.3.1.2.

Wired clients on green can access the internet and a file share on a 
suse box with static IP address 10.2.1.201. 

I want the wireless clients to be able to access the file share on the 
green network and believe I need to set up a DMZ pinhole - is that 
correct?  If so, what port(s) (or range) should I open?

And, do I need a static route configured on the XP client, or is the 
default route sufficient?  Is there something else I am missing?  Any 
help or pointers much appreciated. 

Cheers,
Roger