There appears to be a bug in Fedora 30 (KDE) that sets MTU-values above the 1500 default when connecting to a network.
I noticed this ever since I installed Fedora 30 (KDE) on my laptop. My router runs OpenWrt, and it would crash not long after my laptop connected to it. Fortunately, the logs gave a clue as to why this was happening. It turns out that the switch driver causes the kernel to panic whenever it receives frames with MTU-values above the default 1500 (OpenWrt forum post). I tried to work around this by manually setting the MTU to 1500 in KDE settings on my laptop, but the issue would show up again when reconnecting to the network after waking up from suspend.
When I was using Fedora 29 I never experienced this, and I would like to help with debugging this issue to get it fixed. Does anybody have any suggestions as to how I should debug this?