@JL1963
Hi, may I have the model number of your main router? Is it dual-band? I don't have access to the router. It is in the home-side of my landlord.
What if all the iPhone, iPad Pro, MacBook Air, and AirPrint Canon G4010 are connected to the main router wifi, will you be able to find the printer and print? I can print from all devices on the 2.4G. The printer will not use 5G
When the AirPrint Canon G4010 is connected to the JXX_EXT, what is the printer's IP address, can you ping it on your Apple devices? Don't know how to do that. But I can print from all devices through the main router. It's just the EXT I cannot
If you set a static IP address on the AirPrint Canon G4010, please try to change it to obtain IP address automatically and check again. Don't know how to do that.
Thanks for your help.