I also had the idea to setup a CUPS server on VLAN2 and add my printers to it: there are no NSEC records published by CUPS, so mDNS forwarding is working flawlessly and it's much less hassle than...

@Clive_A Done. I added the requested info to the link I already shared with you via DM. I'm also investigating another possible mDNS problem I observed while doing all my tests that would also be an...

@Clive_A I didn't keep the Wireshark output but I could make another one. I should be able to do so later today or tomorrow.

@Clive_A OK, so I managed to patch avahi-app-0.8 on my pfSense (v2.8.0) with this workaround suggested here and it worked: now my printers are correctly seen on all my VLANs! After a ton of...

@Clive_A I've disabled mDNS on the ER8411 and have setup Avahi an old pfSense box that was still lying around, and I get the same result (do you use Avahi internally on the ER8411?), which is exactly...

@Clive_A Here's an update. I wanted to create a live demo of what happens to the packets from source vlan to destination vlan, and what I observed is that sometimes they are forwarded correctly,...