I have an application running on a linux machine which needs users to be connected directly to the network where the application's interface is located. Unfortunately I have remote users willing to use this application. I do not know much about how this application works but it does not allows users to be routed. It does not even works if the user is nat-ed onto an IP on the same network. The only sollution for me is transparent bridging over the Internet. Another problem is, that multiple sites have to be connected to this server.
I am thinking about to create l2tp tunnels between the cisco routers and the linux server but I do not know how.
Can anybody help me?