How to raise VPN without a managed router?

Question

VPN

Good day!

The question is. there are 2 offices, there are no managed routers, there are ordinary provider stupid ones. How to set up VPN, what methods and technologies. what to read and what to use from the equipment is better?

Answer 1

Raise the server on Linux + OpenVPN or IPsec, plus set up clients on the machines. Read here:
https://www.digitalocean.com/community/tutorials/h...

Answer 2

There are 2 ways:
1. Replace the provider's routers with your own - I would recommend something from the Asus RT-N18U line (no longer available), perhaps ASUS RT-AC57U, look at gigabit interfaces, otherwise 100-megabit processors are weak.
2. Create an application to the provider to organize a VPN network between offices - let them deal with their routers themselves.

Answer 3

If you have access to port forwarding on routers, then
1. you buy a white IP
2 you raise a VPN server somewhere on the network (at least on a working computer, at least on a separate old computer)
3 you forward ports on the router.
All.

Answer 4

For VPN to work transparently between offices, computers must know where to go in order to reach the neighboring network. This is usually done by route
Total options
We change provider routers to the norms of a piece of iron from Mikrotik. We raise VPN between them - everything works transparently for a PC in a local network
We buy the simplest microtics for 1500 rubles, we raise VPN between them, we prescribe routes on each PC through these microtics
Or we do the same on a PC or a virtual machine in a local network. (ready-made distro or pure Linux does not matter. Network card is enough 1 pc