OPNsense and Pfsense are definitely related. Pfsense came first but then OPNsense forked off and created their own version. Pfsense is basically run by Netgate while OPNsense is owned by Decisio. Today they look quite different and both are very capable but I prefer OPNsense because IMHO the navigation and rules are easier to implement than Pfsense. You can run it on a separate PC but honestly I prefer to just use purpose built hardware (see link below) since it’s just easier to maintain and speeds tend to be more stable since it is dedicated equipment.
OPNsense® Shop – Everything to secure your network and more
shop.opnsense.com
The other option if you want to go cheaper is to use something like a Protectli to install either Pfsense or OPNsens and you can try each to see what you like better.
Protectli: Trusted Firewall Appliances with Firmware Protection
Secure your network with a trusted Protectli Firewall Appliance! Fully compatible with open-source software. US-based support, warranty and repairs.
protectli.com
I don’t have a ton of experience with Firewalla so I really can’t do any in depth comparisons but from what I had researched it seems like more of a consumer grade system vs Pfsense/OPNsense which I would put in the prosumer or small to medium business range for firewalls. This doesn’t mean Firewalla can’t work for you if it has all the features you’re looking for, really just depends what you want. Pfsense and OPNsense are more powerful but also made for more technical folks so they would have a steeper learning curve if you are trying to install everything yourself. Lots of stuff on YouTube for both of those so I wouldn’t get too intimidated if you did decide to go that route.
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