@Kevin_Z, thank you for the answer and valuable links. As I see it, my problem could be more global. I need devices supporting IPSEC VPN because PPTP and OpenVPN couldn't establish LAN to LAN tunnel....

I have bought Archer A7 before and have been sure that it is possible to create a site-to-site tunnel between two archers A7. A7 has a separate menu VPN-Server with two options: - OpenVPN - PPTP VPN...