What were you trying to do that didn't work?

On a host with a default route MTU of 1400, try to run a container and inspect the MTU of the main interface:

i.e. 

1. sudo podman run --rm -it alpine ifconfig eth

Will show an MTU of 1500, which causes network issues.

What is the impact of this issue to you?

I cannot use podman to build containers on VMs under OpenShift / Kubevirt (useful when you need privilege elevation but still need isolation) customers will get impacted by this which is frustrating, and hard to diagnose and understand.

For more details:

https://github.com/containers/podman/issues/20009#issuecomment-2470052716