Comment 1 for bug 1627363

This is an interesting bug. We are getting a notification about an external DHCP server for an interface that appears to have no VLAN.

It's possible that this could occur if there is a race condition where the interface was disconnected for awhile, and the notification occurred in the 30-second window of time between when the interface was reconnected and when the MAAS region was notified of the change. But this seems unlikely.

I can put in a quick fix for the crash, but we should also look at the interfaces on your system, how they're modeled in MAAS, and which one would most likely report an external DHCP address.