Hello,
I'll explain my problem.
We have 2 factories, each with fiber connections.
We have TP LinK ER605 routers on each connection.

I would like to create a Site to site VPN to make a single LAN, to exchange files between computers, servers and machines between the 2 factories.

I find information and tutorials, but it changes a lot depending on the versions, so I don't want to make a mistake, could you please help me and explain how I can set this up?

If you need additional information, don't hesitate.

Thanks for the help
Phil