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OlofL avatar Ubuntu

NetworkManager keeps switching default route between wifi and ethernet

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OlofL

I have two network cards, wifi and ethernet. Both are simultaneously connected to two separate networks. Both networks give me a default gateway.

Now, I want my specific ethernet Networkmanager profile to be prioritized over the wifi-profile all the time. But it keeps switching who is prioritized, causing my ssh connections to die. I can confirm this in ip route and see that suddenly the ethernet profile gateway has higher metric.

I do not see a pattern when this is happening, but it seem to happen regardless of what physical and wifi network I have ethernet connected through. There are no interesting logs in dmesg.

I am using a thunderbolt dock that I am connected through

From NetworkManager logs:

jul 14 11:41:58 ubuntu-2004 NetworkManager[1022]: <info>  [1626255718.9975] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 11:42:11 ubuntu-2004 NetworkManager[1022]: <info>  [1626255731.7590] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 11:42:38 ubuntu-2004 NetworkManager[1022]: <info>  [1626255758.0353] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 11:43:04 ubuntu-2004 NetworkManager[1022]: <info>  [1626255784.7638] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 11:43:30 ubuntu-2004 NetworkManager[1022]: <info>  [1626255810.0385] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 11:44:03 ubuntu-2004 NetworkManager[1022]: <info>  [1626255843.7814] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 11:44:17 ubuntu-2004 NetworkManager[1022]: <info>  [1626255857.3367] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 13:24:30 ubuntu-2004 NetworkManager[1022]: <info>  [1626261870.7424] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 13:24:55 ubuntu-2004 NetworkManager[1022]: <info>  [1626261895.1745] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 13:25:05 ubuntu-2004 NetworkManager[1022]: <info>  [1626261905.7472] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 13:25:09 ubuntu-2004 NetworkManager[1022]: <info>  [1626261909.5220] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
jul 14 13:25:26 ubuntu-2004 NetworkManager[1022]: <info>  [1626261926.7462] policy: set 'wifi-ssid' (wlan0) as default for IPv4 routing and DNS
jul 14 13:25:27 ubuntu-2004 NetworkManager[1022]: <info>  [1626261927.0758] policy: set 'ethernet-profile' (eth0) as default for IPv4 routing and DNS
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