How to choose a router that supports VPN?

Question

VPN

Hello, advise me the brands (preferably models) of routers that support VPN protocols, such as IPsec and OpenVPN at the same time (the more the better), and I would like these protocols to function in full, and not in a truncated form (such as Microtic and OpenVPN) It is desirable to be as cheap as possible, since the main goal is to study the principles of operation and settings (high power is not needed)
Thank you!

Answer 1

the main goal is to study the principles of operation and settings

Virtual machines are our everything. There are a lot of soft routers: pfSense / OPNSense, Mikrotik CHR, openwrt, etc. There is also an eve-ng or gns3 project just for network experiments.

Answer 2

I would like these protocols to function in full, and not in a truncated form (such as Microtic

What? Well, tell me what is missing in IPSec on Mikrotik, from what you may need?

Answer 3

Any that supports openWRT or DD-WRT.
For the purposes of training and experiments, you can find rubles for Avito for 500-1000.