@kirenpillay said in UPNP not detected across 2 private LAN interfaces:
more specific terms
"upnp" is pretty generic (common) indeed - half the planet seems to have a play box thus huge network problems.
But "avahi" is very, enormously unique. Throw this one in any search engines out there and you'll know what it is, does, why it exists. True, what is does is rocket science for the most common mortals, but you're not one them, these days are over. You've installed pfSense ^^