If memory serves, those networks are on private IP addresses, which is what I would expect. You don't want to simply route the traffic through your default gateway, as the traffic would be unencrypted. You need to configure a virtual network connection on the gateway computer at each site. Or install a router that provides VPN tunneling. The hosts in each network need to have a route set up so that that device (router or computer) will be used as the gateway for the other network. I'm not sure but the DHCP server may be able to do that automatically if you use DHCP.
If you use samba, you may also need to configure one of the samba servers in each network as a WINS server. See the Samba 3 HOWTO for further information. The samba package installed that book in /usr/share/doc/samba-<version>/.
Last edited by jschiwal; 12-13-2007 at 10:09 AM.
Reason: fixed up.