Oh man. The experience and functionality you’re describing, I don’t argue with. But the problem is you’re using terms that do not mean what you think they mean, and therefore you think I’m saying things I’m not.
There are products that carry I2S over UTP with RJ45 connectors. Those are not Ethernet (which is defined by IEEE standards in the 802.3 family).
I don’t know what the Kii Three is doing exactly, but if it’s Ethernet (802.3 standards, remember) then it would not be damaged by being connected to a computer. That’s why we have standards. If it could be damaged by being connected to a computer then it is not Ethernet. It would be some other kind of proprietary signalling on UTP cable with RJ45 connectors.
If the “Streamer” port on the Innuos device is indeed Ethernet (conforming to 802.3 standards) then it is by definition a Local Area Network. LANs can be used for many things which do not have to include Internet access, management interfaces or even IP addresses. In the distant past we used things like AppleTalk, NetBEUI, IPX etc which are all LAN protocols even though they’re not Internet Protocol.
Given that the “Streamer” port talks to a range of different “streamers” from various manufacturers, it must use some set of common protocols. Are we agreed it’s an Ethernet port? If so, then what layer 3 protocol is it using? IPX? Banyan-Vines? AppleTalk? Or is it using a custom layer 2 protocol that nobody’s ever heard of and all the “streamer” vendors have implemented in secret?
Possible, but not at all likely. There’ll be IP networking between the Innuos and the streamer because that’s just how these things work in the world today. That’s the pre-requisite for DLNA and RAAT and the rest. That doesn’t mean there’s Internet access – IP addresses can be used for purely local communication too, even between just two devices connected by an Ethernet cable.
And it’s smart design from Innuos to not expose their management service on the “Streamer” port even though it’s (almost certainly) using IP. The machine is telling you that the way it wants to work is to be connected to your home network on what calls its “LAN” port so that the specialised low-noise Ethernet interface is reserved for comms with the streamer. You are observing something correctly (the Innuos says it doesn’t have the IP address needed to communicate with the rest of your home network) and leaping from there to the wrong conclusion (that the “streamer” port is not using Ethernet and IP protocols at all, and that it’s not a LAN port).
Please see the difference. I am agreeing with you that to make the device work as intended, you need to plug the Ethernet port labelled “LAN” into the network that you have the rest of your stuff on, and it’ll use that to communicate with the Internet and with apps on your phone or whatever. And it’s also designed to have the music playing system connected to the Ethernet port labelled “streamer”.
But just because that’s the way it functions doesn’t mean you can assert that the technologies used on the ports are fundamentally different. They’re really not. They’re the same technologies just put to different uses.
This whole discussion is about you needing to adjust your understanding of what are literally standardised terms so that you can have a conversation with the rest of us and we can all agree on what the words mean. Should be no big deal really 