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If you’re considering building your own firewall, you’ve started down a long path of homelabbing. I’d encourage you to start with a proper setup and allow yourself plenty of room to grow. You want your setup to be extensible, and the firewall is just the beginning.
I’d grab at least a 15U rack and a Dell poweredge R210. Throw in a gigabit nic and install OPNsense. You’ll have room for your switches, NAS, UPS, etc… later.
I basically did the same, picked up a 12U rack and a Dell R220 as my PfSense box.
Been so stable and can handle anything.