Internet via LAN OpenWRT?

Question

Computer networks

Greetings!
There is a WNR612v2 router (Yes, ER-Telecom) on OpenWRT and two PCs, for some reason the WAN port died on the router, everything else (local and wifi networks, web interface) works. Is it possible to distribute the Internet to a second PC and to a Wi-Fi network if you use 2 network cards on the first one?
That is, the scheme is as follows, the provider's wire enters PC1 network card1, from PC1 network card2 to LAN1 router, from LAN2 router to PC2.
Will it take off?

Answer 1

yes, ICS is called. but it is necessary to keep 1 pc turned on.

Answer 2

It is possible as you suggested, also if your router supports vlan, you can make, for example, 1 lan port as wan. It will be more economical in terms of electricity.