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I had to look it up: CDC stands for "USB Communications Device Class".

I've never once tried to hook any of my many, many Android devices over the last decade+ to wired Ethernet using a USB adapter, but I had assumed it would just work if I did. Interesting.

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Instead of looking it up you could have read the article:

So what’s this about CDC Ethernet and why should I care?

CDC stands for Communications Device Class.

Right. Beyond half way through the article. I saw it, but was so baffled through the top half, I had already searched for it before I continued. I figured someone else would want to know. There's even another comment saying the exact same thing.

Regardless, my comment was mostly about how I had never run into the issue.

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