Network manager clears configuration and takes ethernet cable down when cable is unplugged
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| network-manager (Ubuntu) |
New
|
Undecided
|
Unassigned | ||
Bug Description
I'm not sure if it is ubuntu xenial Kernel or something that does NM, but if you disconnect the ethernet cable, you network lan card stops working for everything.
This might seem obvious, but if you are working with your laptop/pc developing a network service running on your local IP (attached to the ethernet), it stops working because it cannot bind that address. At the same time, if you are running a VirtualBox solution that is bridging all instances with that ethernet interface, you can no longer reach those interfaces because ARP level is disabled (that is, the network interface stops replying to ARP queries)...however, you can still communicate between VMs.
That is, there's nothing that should stop you from reaching a local service attached to the ethernet interface as long as you are sending that traffic from the system itself. At the same time, if you try to reach your VMS (on the virtualbox), you should be able doing so even though you don't have the ethernet cable plugged.
Another interesting element to consider is that if you run a tcpdump on the ethernet (with the cable disconnected) and you try to communicate from a VM) you can see ARP packages arriving, but they aren't replied.
Please, let me know if you need any additional detail, command's output or something similar,
