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Hi @niu1113 . Do you have one or two old routers to use with the active router?
This might help.
https://community.tpg.com.au/t5/Modems-and-Devices/Using-HG659-as-the-wifi-extender-for-Netcomm-Clou...
In your case, the remote routers are set to 192.168.1.2 and 1.3. They need ethernet connection.