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Trying to do a WLAN thing
(alien.top)
A community to help people learn, install, set up or troubleshoot their home network equipment and solutions.
If your router is supported by a *WRT like DD-WRT you can use "Client Mode" or bridge mode and you can do what you want to do.
You only need the router connected to the computer to have *WRT.
Client Mode would create a separate LAN for the computer. Bridge Mode would bridge the LAN from the main router.