This is working as designed.
NetworkManager now uses a metric "penalty" when connectivity cannot be
detected as full for a connection, and reduces the metric accordingly.
This makes it so that if you're connected to both wired and wireless,
and your wired connection becomes bad but the wireless connection
remains, you should retain connectivity.
Similarly, if you need to use your own custom routes to use alternative
paths to be online, this makes sure this alternative can be used
automatically (the lowest metric is what gets used).
You may be able to avoid this issue by removing package 'network-
manager-config-connectivity-ubuntu' from your system if it is installed
-- disabling connectivity checking, which will avoid going through these
code paths.
** Changed in: network-manager (Ubuntu)
Status: Confirmed => Incomplete
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Touch seeded packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1788659
Title:
network manager assigns ethernet default route metric of 20100
Status in network-manager package in Ubuntu:
Incomplete
Bug description:
After upgrading from 16.04 to 18.04, when I boot with an ethernet
cable connected, Ubuntu prefers to use the wifi interface over the
ethernet interface. Wifi is assigned the normal metric of 600 for both
of its routing table entries. However ethernet is assigned a metric of
20100.
I edited the connection details via nmcli to manually set the ethernet
metric to 100. After a reboot, the link route (for the LAN subnet)
correctly has a metric of 100. But the default route for eth0 is still
20100.
nm-applet shows the wifi icon, correctly indicating that the default
route is over wifi rather than ethernet. The only fix is to manually
set the route after every reboot, or turn off wifi. This is a
regression from 16.04.
network-manager 1.10.6-2ubuntu1
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