example of how i would do it
upstairs modem = 192.168.1.254 255.255.255.0 with dhcp enabled
downstairs = set its ip as 192.168.1.1 255.255.255.0 with dhcp DISABLED
to check downstairs enter 192.168.1.1
you want any ap - router to be on the same ip and subnet range as the main modem-router that is supplying the dhcp
so anything plugged in downstairs will get its ip from upstairs and the same with anything connecting via wireless
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