The owner manual says "Connect the RR 2160 to your home network with an Ethernet cable for access to Internet Radio stations or audio files on a home DLNA server."
Regarding the DLNA part:
* Does it work well?
* What server do you use?
* What is your arrangement for this?
Thanks.

I don't own a 2160 but I don't see any reason it would not work well with any DLNA computer with music or video files on it. When the manual speaks of a server it really is referring to a DLNA source which can connect to the 2160 via ethernet cable to stream files to the 2160. Almost any computer today is DLNA capable along with Android phones, disc players and many other devices. Except for Apple products, almost any source you might want to use will work, as long as it can be connected with an ethernet cable or broadcast to a DLNA capable PC or device. Basically your connection is the ethernet cable from a source with audio files on it. Once the 2160 is in receiver mode, the source will detect it and allow you to select it for streaming.

Update: I got it to work with JRiver and MP3. When I tried lossless it failed. So I emailed to Outlaw and Ben wrote back "...DLNA is not ideal for hi-res audio as it is only reliable for compressed audio...". I asked what "hi-res" meant in this context. Ben wrote "...avoid DLNA for your CD quality and above content...".

Other ports, like coax and USB can handle hi-res. But i want the Ethernet to handle 16/44 and higher. I guess I will have to buy a separate device with a better Ethernet, like Allo Signature with Raspberry Pi, and others. I think they are called "renderers" and "streamers".