Most cheapo routers run Linux and use iptables as the firewall.
If the router is controlled by the telecom provider, I wouldn’t trust it.
So I am planning to build my own visualized firewall and route
MINI-ITX/MATX Case with 250W power supplier
Rsrock ITX-J1900B Baytray Board
2 ports PCIe Gigabyte network card
I’d like to use a VM or contaiuner as router. Check this reference.