I have this dock - (CROSSION Super Speed USB 3.0 Universal Docking Station) http://amzn.to/1UwZ3rO and I am trying to get the ethernet port working.
I believe it is using the Realtek RTL8153 chipset. I am not 100% sure on this because I am just getting this information from the disk that accompanied the product. It had a folder labeled RTL8153.
I have tried to find the manufacturers website and was unable to find it to look deeper for drivers. The amazon page said this device had Linux support.
I actually figured out how to connect a moment after posting.
Basically you just need to figure out the device name being reported via this command
Mine was enx002428fe52bc so after that I just need to put the device into an "up" state.
You might have several devices listed so trying multiples didn't have any negative effects for me.