macos 10.7, wireless printer is not working with 3 mobile router

use ethernet cable, connect mac and printer brother directly, set both static ip address, must be different subnet with wifi subnet, eg:
I’m using wifi 192.168.1.1 for the internet, then I have to set the printer and mac etherent to 192.168.2.1, same subnets are not working for printer by some reason.

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