Hi,
If you get this to work you should be commended. Shareport seems to work ok for a "local" network, I am skeptical is it will meet your VPN needs....
You may need something more sohpisticated, if I understood your needs properly, and I may not have.... but I "think" something like "LogMeIn - Hamachi" if I am remembering may be able to do what you need. I tried it out a while back but it was too sophisticated for what I needed at that time....
