Earlier I asked a question about geographically distributed domain controllers:
After the question closed KCTS posted a comment regarding the potential usefulness of "site to site VPN." I would like to know the typical uses for site-to-site VPN, especially in the scenario I described earlier.
I am guessing this is a means of assuring secure connectivity between two servers without exposing their ports to the open Internet. It will help if someone can give me a refresher course on the means by which VPN does its magic.
It will help if someone can supply me with links regarding how to set up site-to-site VPN on servers. Finally, if there are common mistakes to avoid, please let me know what they are.
Thanks so much.