I think I may have gotten ethernet working on the Chromecast. Can anyone suggest a way to test the speed? My DHCP router is a WNDR3700v3 and I also have a WNR3500L and a WRT310N. I turned off my radios on all the SSIDs I ever told my Chromecast to connect to. I have an E2500 on the other end of the house, but I never told Chromecast to connect to it, so it shouldn't be using that.
The steps I used were:
Plug Powered USB Hub into Power Adapter via AC
Plug USB Hub into OTG Cable
Plug OTG Cable into Chromecast
(At this point the Chromecast LED lit up and booted)
Plug USB Ethernet Adapter into USB Hub
Plug Ethernet line into USB Ethernet Adapter
(At this point the USB Ethernet Adapter's RJ45 jack started blinking)
When I checked my DHCP enabled router for "Attached Devices", the Chromecast showed up under "Wired".
To "make sure", I disabled my wireless radios on both of my routers supplying WiFi.
It seemed not to work for a bit, but after waiting(and realising I could not push a YouTube video from my Android when my WiFi radios were off), and pushing a video from my Laptop, it seemed to start working.
So, at this point I'm wondering what the speed and ping is that I am getting and I am also pondering the possibility as using it as a "wireless" display for a laptop hooked up to Ethernet.