How to make a VPN relay?

C

CJSC MetroCraft2019-12-12 07:17:03

linux

CJSC MetroCraft, 2019-12-12 07:17:03

Hello!
How to organize the VPN connection in this way: 1. Normal mode - clients connect to the server and everything works. 2. Emergency mode - in case of problems with the server, all VPN connections are transferred to another server and the VPN tunnel network continues to work. How to implement this?! What protocol to use and what is needed?
Requirements:
1. Authentication and encryption!
2. Support both L3 (IP) and L2 (Ethernet)
3. OS support: Windows, Linux, Mikrotik and Cisco hardware.
Ps We kindly ask you to give an answer without lyrical digressions.
Pps Help, please, don't ignore!!!
Pss Phrases like: "Why is this necessary?", "What for?" and "meaning of action" please do not write!

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A

Artem @Jump, 2019-12-12
curated by the

in case of problems with the server, all VPN connections are transferred to another server and the VPN tunnel network continues to work

This is not called relaying, but redundancy.
Just a backup server, and a script that changes DNS records.