[Nexus 10 Accessories] 3DSammy:
1st round TKO:(

Well that was a bust. My Ethernet adapter arrived yesterday but they did not ship what was advertised. As in my post above I ordered a Gigabit USB adapter and I received a Fast Ethernet adapter. The invoice says one thing and the adapter and its packaging another. The SKU number on the invoice, their web site and the packaging all matched so it is likely they do not have a Gigabit Ethernet adapter. Obviously I have contacted the retailer asking for a full refund.

The adapter could be easily taken out of the packaging so I gave it a try and here is what I found (All tablet testing was performed with a proven OTG microUSB to USB connector):

1) It works as a 100Mbps Ethernet adapter with my laptop. Interesting that it was not recognized by Win8 but it would auto-connect under Ubuntu 13.04. Speeds were what you would expect. As I was only trying to prove that the adapter functioned, I did not try to install the MS-Windows software that came with the adapter (mini-CD).

2) When connected to my Nexus 10 the router's front panel light turned on for the port it was attached to but it did not flash in anyway which usually shows network traffic or obtaining a DHCP IP address. At no time did the router show the adapters MAC as a connected device or was there any related log activity to show a DHCP request. This was consistent for all test with all ROM combinations including stock. I obtained the MAC address during the initial laptop funtionality test.

3) I eventually tried three ROMS (rooted Stock, SentinelROM with KTManta and finally rasbeanjelly). Then after much goggling I found this comment on XDA: A Chinese device Model No:KY-RD9700 doesn't work, which of course is what I was shipped.

I have not given up on a USB Gigabit Ethernet Adapter:

1) I contacted the supplier about this order and ask for a refund based on false advertising. Results are pending

2) After checking around I found the main issue is that the stock kernel only supports Ethernet for specific chip sets. If you have an unsupported chip set you can try to add support to a custom ROM assuming your have the skills. This whole thread is interesting but this post is good for how someone added support for their unsupported adapter.

3) I found that the chip "ASIX AX88178 Controller" is supported out-of-the-box for "Driverless operation with all Chromebooks, some Android Tablets (including ASUS Transformer Prime / Infinity tablets), and Linux 3.3+". Of course JellyBean has a Linux 3.4.x Kernel.

There are two popular out of the box supported USB Ethernet adapters:

1) 10/100Mbps "BobjGear USB to RJ45 Compact Fast Ethernet Adapter made for Android Tablets". This products success has been mentioned by a number of people.

2) 10/100/1000Mbps "Plugable USB 2.0 to 10/100/1000 Gigabit Ethernet LAN Network Adapter (ASIX AX88178 Chipset)". This one was mainly mentioned as working by Asus Transformer users.

I just ordered #2 above.

Should arrive late next week and will write an update at that time.

One last piece of advise which may be of value:

"Make sure you plug everything into the adapter/OTG cable BEFORE plugging it into your N7. While using a mouse/keyboard/hub I noticed if you plug the OTG cable in first and then a peripheral, the N7 won't recognize it."