Sorry for the delayed response, I've been away.
We have a LAN behind a Netgate SG-1000. We access this LAN remotely via OpenVPN which has been set up using the OpenVPN wizard. I believe this is a pretty simple, straight forward implementation.
The OpenVPN interface has no restrictions placed on it, there are no firewall rules other than the default open to all.
The LAN interface has the following firewall rules:
IPv4 Default allow LAN to any rule
IPv6 Default allow LAN to any rule
allow Ping
I am required by PCI to restrict the LAN access to only select IP addresses. As soon as I disable IPv4 allow LAN to any, I am unable to ssh into the LAN via OpenVPN. I can ping the LAN IP, and if I am already connected I do not lose my connection.
Any guidance is appreciated.