How to link 2 sites with VPN
I'm looking for advice on setting up a VPN to link up a remote site to the school network, we have 2 units on an industrial estate on the other side of the town for Engineering and Construction courses, one of these units has a room of computers in with an internet connection, we have locked the machines down with Windows SteadyState but this is causing some problems, for filtering we have a linux based router/firewall/proxy system running (similar to smoothwall can't remember the name), unfortunately the only way to change settings on the linux box (filtering ones mainly) is to physically go to the unit, due to the fact the box uses an older version of dansguardian I cant just copy the filter lists from the main proxy here and the kids have now found ways around the filter. The only real solution I can think of is a VPN that allows us to connect the machines back to the main school network so they are like any other school machine and get their internet feed through the schools proxy.
Ideally I would like to do this with out needing to spend any more money, I think I can do this using one of the Windows 2003 servers at school but I am not quite sure as to what I need to be looking at.
2 x Windows 2003 R2 servers
Several Linux boxes (various distros)
10Mb/s (soon to be 30Mb/s) internet connetion provided by SWGfL
At remote Site
BT Bussiness ADSL connection (not sure of speed) with BT supplied router
Linux box running internet gateway specific distro