For anyone running into the e1000-82545em bridging-to-br0 weirdness under Catalina, I have a workaround that's working fine for me: Install AppleIntelE1000e.kext (I'm using the latest build from the fork at either to /Library/Extensions (the advantage being simplicity; you can install it manually or with the simple KextBeast utility) or by injecting it with Clover (the advantage being that it will likely work while installing macOS or when b
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