I am about to build a vpn using Concentric DSL service between 3 offices in the same city. I will be using a Netopia 3100 router. I am using a 10baseT ethernet with Small Business Server 4.5 as my pdc. The satallite offices are small 3- 5 users and the current idea is to use NT workstation as the servers for the satallite offices. I have never set up a vpn before and I do not know anyone who has set one up. Any advise would be appreciated.