The linux router is where the xDSL lines we rent are terminated, the company providing them to us provides this router and let us manage it to route our traffic where and how we want but do not support adding software on it. They intentionally kept out ipsec for performance reason, I think that was done for harware reason, openvpn is sadly unavailable too :/
For tunneling purpose we have access to gre, ipip and openSSH, gre looked like a good candidates but without the key field support in OpenBSD it solves nothing.
I never thought about using openSSH like this but may be a lead although I am not sure how to route the traffic while keeping the companies isolated from each other.
I need to do some testing to see if the server can support ssh tunnels without using too much cpu.
Thanks for you answer !
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