printer not found when connecting to second computer gx4020

[burpy]

installed and connected GX4020 printer to computerA (win11) over home wifi network.  Then connected to computerB, also win11. But then compA could not print. checked a couple of forums and messed with bitdefender firewall on compA. Finally got compA connected. But then compB does not connect. 

I see that canon manual suggests using only 2.4gHz wifi. Is that right? Regardless, home wifi network has primary access point [with DNS] and second (cascaded) access point [no DNS]. Both have same SSID. Both have 5gHz and 2.4gHz bands with frequencies which have been checked against overlap. This setup allows devices to roam within range. It supports 2 HP printers both of which are accessible from compA and compB. Currently, canon GX4020 printer landed on 5gHz band automagiclly

any ideas why compB does not connect?

are firewalls an issue? 

does a static IP address for the printer help?

/burpy

[shadowsports]

Greetings ,

Did you see the blurb in my first reply in regards to double nat?  If you have devices that exist on multiple LAN segments, then It appears you have two devices handing out DHCP addresses or an improperly configured cascaded network.    

It's very easy to test for this using the tracert command from a command prompt.

If the first 2 hops contain a private IP address, then a double nat or improperly configured cascaded networks exists.

These are the only explanations for 2 private IP LAN segments.

[burpy · Accepted solution]

Yep, the whole issue was that compA and compB were inadvertently on separate branches of my home network. Also, if the printer ever gets connected to another branch [initially, or my manual connection option], devices on the other branch will not find the pinter. 

     Should probably modify guest network so that it does not use the odd branch (172.27*) but stays on main branch (192.168* in my case). 

[shadowsports]

Greetings,

I'm happy I identified the problem for you.  Reinstalling the printer will not fix the configuration problem.  If you do not resolve the improper network configuration, the printer will continue to go on and offline depending on which network a host connects to.  ‌😉‌

Guest networks are often configured to use isolation.  This means endpoints on that LAN cannot see or communicate with one another.  Depending on your hardware, it's possible you can disable the isolation, or as mentioned previously you must ensure only one device is performing DHCP and is handing out IP's from the same pool of addresses.