I am looking to setup an IPSec VPN server in our organisation using a Windows server 2012 machine with remote access and routing installed. I would then like to perform a site to site IPSec VPN connection between our remote offices and our central one using Zyxel USG50 devices.
I have been looking for guides on how to accomplish this, but only ever seem to find ones where the USG is the VPN server, and other devices such as mobiles are connecting.
By the looks of things I have set what is needed on the USG, but the VPN dial just times out. I have disabled the firewall completely so it is not that, and I suspect perhaps I have the wrong encryption types enabled or something of that nature.
The L2TP VPN works from my Windows machine within and outside of the network, and does require my domain username and password to log in, but the USG only has a field for a shared secret. I am finding this device to be very complicated to work with.
Has anyone any experience, or can they point me to some guides, on setting up a USG to connect to a Windows server 2012 using IPSec or L2TP over IPSec.