MacOS 26 Third Party Ethernet Support.

Does it appear in System Information? What do you see there?

Hold down the Option key, and from the Apple menu choose System Information...

then click on Ethernet. What do you see?

As I'm writing this, my mac is connected using an ethernet adapter and I get the image below.

Can you post a similar image of yours?

It's not Apple's responsibility to include drivers for every 3rd party device on the market.

Contact the manufacturer of the device.

erikbock wrote:

It worked before so they actively removed it.

It worked until you upgraded your OS according to your initial post. Most computer users check that all their third party drivers will continue to work before upgrading the OS. It is the responsibility of the third party manufacturer to develop and make available drivers for their product. It is not the responsibility of Apple or for example Microsoft to ensure their OSs work with third party hardware.

erikbock wrote:

I have an Anker USB-C to Ethernet adapter with the ASIX AX88179 chipset. It has always worked with my MacBook Air and subsequently my MacBook Pro. Now that I have upgraded to MacOS 26 and now 26.1 that chipset seems to no longer be supported. I have tested the adapter to make sue it was functional and thanks to my employer I have one from Lenovo so I know it isn't my Mac.

If at all possible, I would test this adapter in a Mac running a previous OS, and also on a different Mac running Tahoe.

It is possible that the adapter does not work in Tahoe, but this seems unlikely, and that is why testing on a different Mac could be illuminating. I have never seen an USB to Ethernet adapter ceasing to work because of an OS upgrade.