Basic VPN question

[jsaad]

Here is my plan: I have a cable modem at one office and DSL with a static IP at the other. the cable modem has a static IP as well. At the home office (w/ the cable modem) i have a server with 6 clients, the application is a basic payroll system, client software runs a PCs, server is a windows machine.

at the office with the DSL, I want to install the client software on maybe 2 PCs, to connect to the server back at the home office.

I believe VPN is the solution for me. I've looked at the adtran netvanta 2050 and the multitech RF560VPN.

what I do not understand is how the client software on the PC at the remote site knows to connect to the server via the VPN rather than just sending packets over the Internet or the small LAN at the remote office.

know what I mean? can anyone give me some ideas as to what I am not understanding?

 

[AlexIT]

There is a route added to the PC when the VPN is established, so it knows to send packets to that IP address range via VPN.

Also, since you use non-routable IP addresses for LAN PC's if your PC tried to send one out, the first router it comes to would drop the packet (every router knows i.e 192.168.X.X is not supposed to go anywhere, so it gets dropped.)

Alex