If all of that looks good, then seeing as you've already tested other cables and modem ports and are able to get gigabit with that equipment on other devices, it would seem you've got a bad TB16, in which case the next step would be to call Dell Support to arrange a replacement. If that doesn't do it, terms of updates, please confirm you've installed the latest version of ALL of the updates listed below, and if not, install them in the order they appear: Still, see what you find yours may be a simpler fix. :) That said, on that adapter I ended up having to open it up (which was easy on that adapter), but that may not be feasible on the TB16. After I fixed that, I immediately got gigabit. I spent a few hours trying to troubleshoot this in software before I finally took a look inside that port and noticed that some of the pins didn't look right. 100 Mb Ethernet can operate over only 4 pins, whereas gigabit requires all 8, and I remember having a USB Ethernet adapter once where a few of the pins had gotten stuck pressed down or deeper into the connector relative to the others, and as a result, they didn't make proper contact with the cable when it was inserted - so all of my connections were stuck at 100 Mb. One thing you can check would be the physical pins inside the Ethernet connector on the TB16. WiFi adapters will report more possible values because the WiFi standards define more, but even there, the OS will report the negotiated link rate, not real-time actual throughput. For that, you can look in Task Manager and go to the Performance tab if you want. That's because the area you're checking only reports the link speed that was negotiated between your Ethernet adapter and whatever device is on the other end of the cable, NOT real-time actual throughput statistics. Just fyi, on wired Ethernet, Windows will only ever report 10 Mb, 100 Mb, 1 Gb, or 10 Gb (on adapters that support it), regardless of the speed you're getting from your ISP. Still, I understand being reluctant to install that if it's not listed as applicable to the TB16. I'm not sure if they discovered an issue on the TB16 or if this is just a glitch in their listing, and sadly I can't even remember if I installed that exact version of the firmware update. Interesting, I installed a firmware update for the Realtek LAN controller on my own TB16 and didn't have an issue, although in fairness it was listed at the time as applying to the TB16. Well, I've managed to find the Realtek GBE Ethernet firmware update, but it claims to be intended for WD15 docks only, not to the TB16, so I'm afraid to install it. I haven't been able to find any Realtek firmware over Dell's website, the drivers page lists only three drivers which I have installed. I even disconnected other peripherals connected to TB16, hoping for a difference. Tried different modem port, disconnected my additional WiFi router (even though my 9360 is connected directly to the modem). I've played with the cables obviously - I'm using Cat.6 network cables and tried 3 different ones. My Windows network settings claim to have 1Gbps connection established. Now, 250 Mbps is the speed I'm getting from my ISP and before I started using TB16 I was able to utilize its full speed (also using Dell's port extender on USB-C that included network port). Thanks, jphughan! I've reverted back the setting to the factory defaults to get comparable results, as I was tweaking them only to see if any difference occurs.
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