For convenience, we call, in this note, the present router as master router, and the old router as AP.
Firstly, assume the master router has been configured with the following settings:
LAN IP: 192.168.0.1
Subnet Mask: 255.255.255.0
DHCP Server: Yes
UPnP: On
Wireless SSID and security mode: set up according to router manual
Before connecting the master router and AP, configure the AP with settings:
LAN IP: within subnet of master router such as 192.168.0.2
Subnet Mask: 255.255.255.0
DHCP Server: No
UPnP: Off
Wireless SSID and security mode: the same as that of the master router
Finally, connect the master router and the AP via LAN port to LAN port directly and leave the WAN port of the AP disconnected.
Rebooting one or both devices maybe necessary to take effect the configurations.
