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Raspberry pi 4 compute module might be good for building your own router too. You can attach a pcie network extension or usb to Ethernet for local usage. All of that would cost under $70. https://www.raspberrypi.org/products/compute-module-4/?varia... https://www.zahradnik.io/raspberry-pi-as-a-home-router Edit: You would be better served by other boards from this benchmark repo for vpn usage: https://github.com/Thoma…
How is it great with one NIC? Ethernet adapter and USB speeds seem less than ideal.
It's definitely not for people like OP but may work for other people who don't want to pay much and still have something decent that they can hack themselves.
I have tried to flash open firmware on my router before but it didn't work out. I had a raspberry pi already so I decided to convert it into a router and use it.