Is it possible to lay vpn l2tp between two routers that are connected point-to-point?

Question

VPN

Is it possible to lay vpn l2tp between two routers that are connected point-to-point? and only one of the routers has an external ip. Please tell me and if suddenly there is an opportunity to show a network map)

Answer 1

and only one of the routers has an external ip.

You can, of course, one will be a VPN client, the other (the one with an external IP) will be a server ...
As for the instructions, I won’t tell you, because. different routers have their own, but you can google it ... The network map is very simple :) On the router that is the client, you just need to configure traffic routing (if you need to wrap all traffic in a VPN) or traffic marking (for individual sites, for example), and let all network clients through a VPN connection, unless of course there is such a task. How to do this - you need to look at what kind of router.