Setting Up One pfSense Behind Another
Further segmenting networks with a firewall behind a firewall
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In this post my goal is to run a pfSense firewall behind another pfSense firewall.
Why configure one pfSense to run behind another?
Because when you run a device on the edge of your network, you cannot see what is coming out of that device. There’s no device in front of that device to inspect the traffic. It’s heading out of that box to the ISP. The ISP can see what is coming out of your edge device but you cannot.
So that’s where putting one firewall in front of another can help you inspect the traffic that’s coming out of the intermediary firewall. I wrote about that here in Watching the Network Watchers:
