VPN on a 1750 router

[bubarooni]

I currently have a three node WAN running frame-relay. I wish to add a fourth node soon and am hoping to do so using a vpn.

My current configuration consists of a router (Cisco 1750)at each location and a Cisco PIX 506 Firewall at my main site. I have a 600 kbps cable modem connection that supplies internet access for all three sites connected to the PIX. I am using 192 addressing and the routers at my two remote locations dole out ip's at their respective locations (192.168.2.0 and 192.168.3.0). I am using DHCP off a NT 4.0 server at the main site (192.168.1.0).

I currently have a vpn connection at each location that connects one machine to another company's server that processes orders. However, I will have about 25 machines on the local LAN at this new site and definitely don't want to configure the firewall for each machine.

At my new, fourth location I would like to get another 1750 router, add a VPN module to it and connect it through a DSL connection to my PIX here at the main site so that the entire network at the new site has access to the necessary resources here at my main site. Is this possible? Is this a 'Site-to-Site' VPN?

Any ideas, hints or sample configs will be greatly appreciated.

Thanks,
Kelli