The VPN stuff might be easy if I could figure out how to make FBSD1-3 route through FBSD4 (regardless of the fact that they are all on the same subnet... the traffic from FBSD1 needs to "bounce" off FBSD4 on it's way to FBSD3 for example... either that, or maybe the gif interfaces count as distinct interfaces for routing?
May be nos-tun, mpd (PPPoE), or even native netgraph solutin can help. (There is one example for udp tunnel in /usr/share/examples/netgraph). In both cases you will got separate interface for each connection. But, in any case, if all FBSD1-3 boxes can communicate whit each other directly, you have to apply appropriate rules on these boxes to make this impossible.
Hope this can help you a bit.
--
Sincerely yours,
Artyom V. Viklenko.
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