alt Hacker NewsMy network is extremely ordinary and doesn't need any special settings. PC is plugged into an unmanaged switch which is plugged into the router. Super standard stuff.
Specifically, on my machine interfaces created in KDE settings have a flag to prevent automatic DNS resolution toggled on, and this is not represented by a corresponding checkbox in the wizard or when editing the interface. As a result I could ping other devices on the network and external IPs like 8.8.8.8, but not browse the web or do anything else that requires DNS resolution. One has to use nmcli to toggle that flag off.
> ...interfaces created in KDE settings have a flag to prevent automatic DNS resolution toggled on...
By this, do you mean that interfaces created will get their IP addresses via DHCP, but will ignore DHCP-provided DNS & etc servers?
If so, given how incredibly insane that is to be a default, there's no way that the wizard is doing that. Given my past experience with NetworkManager, I expect NetworkManager made a batshit-crazy backwards-incompatible change and didn't bother to tell anyone. I know that that doesn't fix your problem, but maybe it will encourage you to find out how to stop using this fantastically complex network management software that you don't even need and is clearly maintained by a pack of ADHD-addled clowns.
EDIT: And no, I'm very aware that this does nothing but reinforce your point that some of the components that the major Linux distros are using are nothing but boxes of razor blades. I guess I'm just lucky that I came across Gentoo Linux a quarter-century ago.