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This should be plug-and-play, only it isn't. I plugged one end onto my Ethernet cable (working with the previous computer) and the other into my MacBook Pro and there was no internet. I plugged the adapter into the other Thunderbolt port and there was still no internet. I unplugged the Ethernet cable from my iBook and tried the adapter/cable combo there. Same story. I prepared a bad review and was getting ready to request a refund, when it was time for dinner.
Next day, there was still no connection to the MacBook but I tried putting the adapter between the Ethernet connection and the iMac's Thunderbolt port (I KNEW the Ethernet cable to the iMac was working) and I still had internet. I put the adapter back on the other Ethernet cable and plugged it into the iBook. It works perfectly now. I've even swapped the locations of the two computers (which required disconnecting/reconnecting everything) and there's no problem.
I have no explanation for this behavior but I would not recommend this adapter because there are numerous other reviews of undependable behavior. I had no choice about buying it because it's a two-hour trip through the mountains to a city large enough to where I might find an alternative. Some other reviewer mentioned a Belkin adapter — I'd recommend trying it before buying this adapter.
This is THUNDERBOLT 2, or maybe 1. Newer Macs have THUNDERBOLT 3, which is physically different and what I need. It's STUPID that Mac didn't change the name, and virtually no products are specific about which version of thunderbolt they have - and the picture doesn't show the end of the plug, again useless.
So I must return this and will ask 20 annoying questions before I buy my next one because THERE ALWAYS NEEDS TO BE A NUMBER FOLLOWING THE WORD "THUNDERBOLT" OF THE DESCRIPTION IS 100% USELESS.
This did not work automatically for me. From the Amazon reviews, apparently a prompt would appear in your Network Preferences, you'd click a few buttons, and you'd be good to go. When I plugged it in, nothing happened. I googled set up instructions and found this from Apple: [...] Going through the steps it provided didn't help, because the prompt still didn't show.
In the end what got it working didn't even involve a prompt. From googling the problem, I realized that the Ethernet connection was supposed to show as "Thunderbolt Ethernet" in the services list in Network Preferences, which it was not. When I knew how to describe the problem, I was able to find an answer: [...], which involved directly editing a .plist file and rebooting the computer twice.
From the various forums I read, it sounds like there are a lot of different things can go wrong with this interface based on your computer's hardware, software, and what changes to your network configurations you've made. I feel like all of this room for difficulty would warrant a product manual and detailed troubleshooting tips to be shipped with the device. It only came with a Warranty and FCC Compliance Statement.
My computer specs: MacBook Pro (Retina, 13-inch, Late 2013), OS X Yosemite 10.10.5
I am frustrated with this product. While I like the speeds it gives me on my Airbook, the product design is flimsy. I have just ordered my third adapter because if my PC is jarred or (heaven forbid) falls off a couch with the adapter attached, it easily bends and breaks. The problem is right at the port that connects to the PC, and the cabling doesn't seem strong enough to sustain any pressure at all. Please, how about a redesign for sturdiness? (PS--I'm trapped because this is the only option for Ethernet connection to my mac.)