Mesh VPN with OpenVPN

[TC10284]

So I currently have three sites that I need setup with some type of mesh VPN. Hub and spoke is an option, but it is not preferred.

Site1 - 192.168.16.0/24 (primary site with our server)
Site2 - 192.168.1.0/24
Site3 - 192.168.2.0/24

Each site has a pfSense box in place. Site1 and Site2 are currently connected properly with OpenVPN
Each time I try to connect Site3 to Site1, Site3 gets the tunnel IP of Site2, which is 10.10.10.1

In the near future, we will need a fourth site setup and connected to our network.

What is the best way to setup a "mesh" VPN? It does not even have to use OpenVPN as long as it is fairly simple enough to setup.
I would prefer OpenVPN, but would need help on what to do.

Thanks!

[TC10284]

So after many hours of trial and failure, I came across these two guides and thus far it has got me working with IPsec across all three sites so far.
I have yet to do a full mesh setup with IPsec thus far, but I can ping the central server, which was my primary goal that I could not do previously with Site2 and Site3 simultaneously connected.

https://www.youtube.com/watch?v=PZjf2s53sss
http://conheotiensinh.blogspot.com/2009/11/vpn-ip-sec-site-to-site-with-pfsense.html

[Derelict]

What was set as the tunnel network in the OpenVPN server and the clients?  This stuff kinda just works.

Are you sure you need mesh?  Hub-spoke is a lot easier to maintain.