So i set my TL-WR940N router to access point mode and use it to extend Wifi from a main router using cable from the main router LAN port. The WR940N default gateway is 192.168.0.1 as mentoined in the manual book and website. At some point the router didn't provide internet access yet the light is blue which mean its still get internet from the main router. I tried to change some setting from the default gateway and it didn't fix the probelm, so i decided to reset the WR940N. Somehow the router setting can't be accessed again both from 192.168.0.1 and tplinkwifi.net. Later I found out that the devices connected to the WR940N router have IP address based on the main router. When entering the main router default gateway, it show the main router setting instead.

Is that how access point mode supposed to work?