The Belkin USB-C to Gigabit Ethernet Adapter allows you to connect to wired networks with speed and endurance where wireless connectivity is unreliable or inconsistent. Another common chip type in cheap USB Ethernet adapters is RealTek RTL815x. I had a spesific use case: the Ethernet port was dead in my old Mac (OS X 10.6 Snow Leopard), and I needed more USB ports. On the Mac, some information about the chips may be found with System Profiler, item USB.
If anyone is still having problems seeing a USB to Ethernet connection in Network settings, here's what worked for me.
1. I'm using the Apple dongle, USB to Ethernet. OS is High Sierra 13.13.4
2. Could not see the connection in network settings.
3. When you plug in the dongle, go to the menu bar, and click on About this Mac. Choose System Report. Scroll down to the USB section. You should see AX88772 (it's important that the dongle is plugged into the USB port on the MB). I think that's what the dongle wants in terms of the driver, which for some reason seems to have been broken in this iteration of OS.
4. Go to the ASIX website and download the driver for AX88772. I used the latest version 2.6.0
5. Install the package. The machine may give you a message saying your security preferences are blocking it. Just go to security preferences and tell it to allow installation.
6. The machine will ask to restart. Restart it.
7. Go to network settings. You should now see the option for the USB to Ethernet connection. Connect your Ethernet cable to the dongle, and you should be in business.
Hope this helps. Just wasted 5 hours of my life over a few days trying to figure this out, and add in two hours with the ever polite, but in this case unhelpful Apple support people.
MacBook Pro, macOS High Sierra (10.13.4), USB to Ethernet Issues
The adapters and cables in this article work with these Mac computers and iPad Pro devices:
To find the right cable or adapter for your Mac or iPad Pro, use the information below to identify the connector on the end of the cable coming from your display, hard drive, camera, hub, or other device. Check the end meant to plug into your Mac or iPad Pro.
If you're using an Apple Thunderbolt 3 cable or other Thunderbolt 3 cable with your display or other device, it will connect to your Mac without an adapter.
The Apple Pro Display XDR and LG UltraFine 5K Display use Thunderbolt 3.
If you're using a mophie USB-C Cable with USB-C Connector or other USB-C cable with your device, it will connect to your Mac or iPad Pro without an adapter.
The LG UltraFine 4K Display uses USB-C.
If you're using a USB-A cable with your device, use the Apple USB-C to USB Adapter, the Apple USB-C Digital AV Multiport Adapter, the Apple USB-C VGA Multiport Adapter, or another USB-C to USB-A adapter to connect your device to your Mac or iPad Pro.
To charge an iPhone, iPad, or iPod touch from a Thunderbolt 3 or USB-C port without one of these adapters, you can use the Apple USB-C to Lightning Cable instead.
If you're using an Ethernet cable with your device, use a third-party USB-C to Ethernet adapter, such as the Belkin USB-C to Gigabit Ethernet Adapter.
Thunderbolt or Thunderbolt 2
If you're using a Thunderbolt or Thunderbolt 2 cable with a Thunderbolt display or other device, use the Apple Thunderbolt 3 to Thunderbolt 2 Adapter.
This is the correct adapter for the Apple Thunderbolt Display.
Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort . They have the same shape, but use different symbols on the cable and port.
If you're using a Mini DisplayPort cable with a Mini DisplayPort display, use a third-party USB-C to Mini DisplayPort adapter. Check with its manufacturer for compatibility with your Mac and display model.
This is the correct solution for the Apple LED Cinema Display.
Mini DisplayPort is not the same as Thunderbolt or Thunderbolt 2 . They have the same shape, but use different symbols on the cable and port.
If you're using a DisplayPort cable with your display, use a third-party USB-C to DisplayPort adapter or cable, such as the Moshi USB-C to DisplayPort Cable.
If you're using an HDMI cable with your display, use the Apple USB-C Digital AV Multiport Adapter or a third-party USB-C to HDMI adapter or cable.
If you're using a VGA cable with your display, use the Apple USB-C VGA Multiport Adapter. Or use a third-party USB-C to VGA adapter, such as the Belkin USB-C to VGA Adapter.
If you're using a DVI cable with your display, use a third-party USB-C to DVI adapter or cable. Check with its manufacturer for compatibility with your Mac and display model.