How to use 3rd-party USB Ethernet adapter with El Capitan I am plugging a USB Ethernet adapter (not Apple-brand) into my MacBook Pro (Retina, 15-inch, Late 2013). No go.

I do not see any relevant "USB Ethernet" item listed in System Preferences > Network. Should one appear when I plug in the adapter? Should I add an item with the "+" button? 



When I use the "+" button, I only get a list of "Thunderbolt Bridge", "Thunderbolt 2", "Thunderbolt 1", "Bluetooth PAN", "Wi-Fi", "VPN", "PPPoE", and "6 to 4". I do not see any option for a USB-Ethernet adapter. Is this no longer supported by Apple?



The Apple menu &gt; About this Mac &gt; System Report (button) &gt; Hardware &gt; USB report shows that I have a product by Realtek Semiconductor Corp. (company web site)
For Realtek based USB 2.0 or 3.0 Ethernet Adapters, you can get the driver from Realtek which works for both 8153 and 8152.