I've upgraded two Macbooks and now a M1 iMac. The iMac seems to have broken DNS only on the built in eth interface. I can ping IPs (internal and external). DNS works fine when I switch to Wi-Fi. DNS works fine if I use a Belkin USB-C to eth adapter.
I've tried reboots, deleting eth service and adding it back, I've tried alternate DNS server IPs. I've not gone as far as to start deleting network related plist files or whatever.
I've also noticed post upgrade every app is asking for permissions to desktop, mic, etc. Messages logged me out. It's like a fresh install almost with nearly every app and service giving me an intro screen or asking for login or permissions.
Any thoughts on how I might be able to fix this?