If you want to play Civ5 multiplayer game in virtual LAN you can use new game tool: EVOLVE (https://www.evolvehq.com). It is very easy.
Evolve VPN Client:
Right now I'm not sure if this will improve Civ5 MP stability or not, but it will likely solve a lot of the firewall and router issues that some players might have. So I would like to have this tested by you guys and get some feedback.
You have to activate first two options to detect civ5.
It works very well, I'm suprised that it is not popular. You have to activate all features to detect civ5, picture #2. Setting everything is a little bit hard at the beginning but after this you can play civ5 over VPN, import users list from STEAM, Facebook, Google+ and integrate it with YouTube (automatic video upload to YouTube). Additionaly it has TeamSpeak feature and very nice lobby for VPN network. Really nice tool for players.
You can add me to your Evolve friends list clicking on this link:
Link to civplayers.com VPN network:
Link to KAC-CIV5-VPN (forum.civilization.org.pl) network:
Info in polish how to setup this VPN:
Opis po polsku jak ustawić sobie ten VPN:
Unfortunately you have to use STEAM to start Civ5 but you can switch STEAM to Offline mode.