Public bug reported:
I have an Ubuntu 17.10 box with WiFi and Ethernet devices. The ethernet
device is not connected at all. The WiFi is connected to WiFi network.
The problem is, the connection drops itself after a while. I did some
research and find out, the NM creates a new connection for the ethernet
device, assuming Avahi IP for that connection, actually making this
device a default route in a routing table. Thus, all outgoing packets
are going through a non-connected ethernet device instead of gateway in
WiFi network.
See commands output for details.
If I delete that default route manually, re-run dhclient to get a new
route or disconnect enp9s0 using NM, the internet start working again.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "commands_output"
https://bugs.launchpad.net/bugs/1734745/+attachment/5015325/+files/commands_output
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https://bugs.launchpad.net/bugs/1734745
Title:
NM assumes avahi ip addres and default gw for disconnected device
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