Use ethernet port on Raspberry Pi for LAN


So, I have a TV that does not have Wi-Fi built-in but has an ethernet port.
I do not have a way to get an ethernet cable from my main router to this TV.
I do however have a Raspberry Pi 3 B+ with OpenWRT installed which has a built in Wi-Fi and an on-board NIC.

What I was trying to do was to connect the Pi via Wi-Fi (acting as a WAN connection) then connect the ethernet cable from the Pi directly to the TV to give it network connectivity.

I am able to get the device connected to Wi-Fi but for the life of me I cannot figure out how to get the on-board NIC to provide internet access to the TV. Every time I connect the cable, there is simply no connection. I tired connecting to a laptop and get the same result.

How exactly is this done?

is the ethernet port configured as LAN or WAN ?

So I changed the ethernet port to my wireless device which is my wan.
Not sure if
2021-12-22 16_54_08-Ubuntu 20.04.3 on GETH - Virtual Machine Connection
this is correct?

go into wireless, scan for networks, and join.

put the wifi interface, running as client, as WAN.

Keep/change the ethernet port as LAN, make sure the DHCP is enabled, and the subnet on the wifi client interface and LAN interface aren't the same.

Thank you!

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