My machine have 2 ethernet ports, there is a way where i can pass all the network traffic through it? (Extra details in text)

So, i want to know if is possible if i can route all the traffic from devices connected to WIFI and also by other means in my network to a single machine, that centralizes internet access. Phisically the CAT5 cable would be: ISP router -> Server -> <- Other machines in the network

Thinking on that to basically substitute my router(?) in this part i cant explain very well my idea.

Also making the server a DNS server, and making proxies to it. Thinking on doing that to be able to make my whole network use a single VPN access too.

English isnt my main language, sorry for mistakes