@JKnott I said what I said, if I wanted a VPN I would have said VPN.

I want to daisy chain 2 different firewall configurations by different builds together on the same LAN before it goes out to the modem's ISP. On top of the double firewall I will be having 2 or 3 VPNs "on" as well but I am not asking how to do the VPN, I am asking how to daisy chain 2 firewalls together as I never have used 2 firewalls at the same time before only 1 but now I want 2 on.

Is this achieved easier through LAN-to-LAN, or a Double NAT, or the 2nd Layer router also has an option called "Site-to-Site"; the pfSense btw is what will be behind the modem while the other firewall will be within the inner part of the LAN