Help with some routing/filtering configuration for CUPS printers in Debian linux

[Logi]

I have an RT-AX88U as the main router connected to the internet, it has 2 printers (Brother Laser and Epson color) both connected via Ethernet cable directly to the AX88U. I have a Linux laptop running Debian 12, when I connect the Linux laptop directly via wifi to the AX88U the two printers will be auto discovered by Linux using via CUPS driverless, everything works fine. The network here is 192.168.50.0 / 255.255.255.0

As part of a Home lab I am building, I have connected an RT-AX86U (WAN port) via ethernet cable to the RT-AX88U (Ethernet port), in Router mode (part of the lab objective), The network here is 192.168.100.0 / 255.255.255.0. Because of the Routing and the laptop and the printers being now on separate networks, I am having some issues with the Auto Discovery of the printers, I am outside the Broadcast area, printers are broadcasting some protocol, I don't know which one, in the 50 network, therefore they are not seen in the 100 network.

Is there a configuration (that doesn't mean setting up the AX86U as a Bridge, the purpose of the lab is to have to networks) that I can setup in the AX86U that will allow me the printers to be auto discover on the local network of the AX86? I know I can connect the laptop to the AX88U wifi network when printing, but that's not the purpose of the lab.

Thank you

NOTE: AX88U running Asus FW, AX86U running Merlin FW

 

[Jeffrey Young]

According to this article, printers on a different subnet must be added manually.

Setting Up Network Printers by Using CUPS Commands - Configuring and Managing Printing in Oracle® Solaris 11.2

A network printer is a hardware printing device that is connected directly to a network. A network printer has its own system name and IP address.

docs.oracle.com

 

[torch]

You could try to run a /jffs/scripts/avahi-daemon.postconf to include:

pc_append " " "$CONFIG"
pc_append "[reflector]" "$CONFIG"
pc_append "enable-reflector=yes" "$CONFIG"