Comment 2 for bug 1742505

Eric Garver:

"Most likely you are seeing this bug:

  https://bugzilla.redhat.com/show_bug.cgi?id=1488484

It's actually an issue with the kernel GRE driver ignoring IFLA_MTU when
the device is created."

Creating test package with proposed fix:

https://patchwork.ozlabs.org/patch/860192/