I would like to build some kind of "virtual network" between two companies located in two different countries. This way, an LAN machine (192.168.x.x) located in the A company could ping directly a LAN (172.16.x.x) machine located in the B company... And vice-versa of course.
In one word: a tunnel...
I guess I have to put, behind ISP router of each company, a box to "connect" my bridged networks. Of course the "conversation" must be done in a secure way (VPN)
Fine, but now What kind of linux distro. will fit the best ? Zentyal, Ipcop , third one ?