WiFi to Router to Switch to Computer

I have a Creta and I would like to configure it in such a way that I can assign it a static ip which connects to my local network, let's say 12.102.12.1/24, and also connect to my wifi. The end goal is that I can plug the router into a switch, and my devices which are also plugged into the switch will be able to access the internet through the router. Each device has a static ip in that same range. Each device is using Ubuntu.

Thats thing to do own DHCP to make static lan IP address with mac address.

Hi,

Can customize static IP for LAN or WAN of the router.

Please show us the topology figure of your network what you want, if you did not understand or unknown to config, topology is the basic info.