Limerick wroteI need the all LAN to be on the VPN
depending on what that
actually means .. You can have access to your entire home LAN and your home LAN can have access to your VPN without a router based VPN.
Limerick wroteread in different places that there are important firewall configurations to set up both sides
The only firewall configuration you
require is that the port you use for your VPN server is open on the firewall which is sits behind.
If you want to learn about OpenVPN I recommend using Linux, even in a Virtual Machine is sufficient. Once you understand how it all fits together, configuring your routers should pose less
or even no problems.
If not .. your choice ..