Bluesound Node 2i Question

Just bought and set-up a Node 2i.  Set-up was real a pain, but after that, it works great and sounds pretty good.  My question is about streaming. We set it up with BluOS on an Ipad.  The Node is connected directly to my amp via analog RCA.

Is the music streaming from my router to the Node, or is it streaming from my Ipad to the Node?    I would have expected to enter my router password, and this was not required in the set-up process.