Zeroshell OpenVPN LAN to LAN Help

Hi There,

I am trying to create a Mikrotik to Zeroshell LAN to LAN connection (using openvpn). I have configured zeroshell and have a Pre-Shared key generated from it, but i don’t know what to do with it?

Can somebody help me understand if PSK can be used, or is it x.509 only?

thanks

Kieran