Using hardware from Lanner I have installed firewalls using pfSense.
The last installation utilizes two firewalls in a redundant setup.
NAT forwarding, CARP, Load Balancing, and more are in use.

Web servers, and email gateways, are in the DMZ and pfSense load balances the incoming connections between these servers.
Connections can be made through either firewall directly or via the CARP address.

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