Roon on multiple subnets

Indeed same goes for UDP broadcasts they are limited to the same subnet unless you configure a router to not to do so, just a bit more configuring required. UPnP and Sonos also use SSDP on UDP port 1900 which isn’t forwarded by default either.

Er ok. Well I’ll be more specific then. Here’s your entire sentence:

That’s pretty much incorrect. You have to go out of your way to configure UDP to NOT traverse subnets. You appear to be conflating transport protocols and broadcast / multicast / unicast, as others have mentioned.

The same goes for all broadcasts and multicast traffic. The type of multicast traffic or the transport layer protocol or port used to send that traffic is irrelevant.

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I was referring to UDP broadcasts, multicasts which don’t. Perhaps I wasn’t clear enough but as we where discussing device discovery I thought that would be a given but it appears not.