Ricbot network issues: Difference between revisions
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Just a summary of some items found on the internet. | Just a summary of some items found on the internet. | ||
=== Set Wi-Fi as | === Set Wi-Fi as default route === | ||
On robots with a cabled local network without internet, it is annoying that the wifi connection is not the default route for e.g., updating the operating system. | On robots with a cabled local network without internet access, it is annoying that the wifi connection is not the default route for, e.g., updating the operating system. | ||
See the default connection, like: | See the default connection, like: | ||
ip | ip route | ||
default via 192.168.7.6 dev eth0 proto dhcp src 192.168.7.22 metric 52 | default via 192.168.7.6 dev eth0 proto dhcp src 192.168.7.22 metric 52 | ||
default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 600 | default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 600 | ||
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192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.22 metric 52 | 192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.22 metric 52 | ||
Here, the default is 192.168.7.6, the wired connection without | Here, the default is 192.168.7.6, the wired connection without internet access. | ||
==== Solution ==== | ==== Solution ==== | ||
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Check default connection with | Check default connection with | ||
ip | ip route | ||
default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 24 | default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 24 | ||
10.197.208.0/21 dev wlan0 proto kernel scope link src 10.197.215.135 metric 24 | 10.197.208.0/21 dev wlan0 proto kernel scope link src 10.197.215.135 metric 24 | ||
192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.4 metric 56 | 192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.4 metric 56 | ||
Now the default is wlan0, with the best metric. | Now the default is wlan0, with the best metric. | ||
Latest revision as of 15:36, 2 September 2026
Back to Ricbot
Network Manager
Just a summary of some items found on the internet.
Set Wi-Fi as default route
On robots with a cabled local network without internet access, it is annoying that the wifi connection is not the default route for, e.g., updating the operating system.
See the default connection, like:
ip route default via 192.168.7.6 dev eth0 proto dhcp src 192.168.7.22 metric 52 default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 600 10.197.208.0/21 dev wlan0 proto kernel scope link src 10.197.215.135 metric 600 192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.22 metric 52
Here, the default is 192.168.7.6, the wired connection without internet access.
Solution
This can be fixed by using connection metrics. A low metric is the preferred connection.
Need a package:
sudo apt install ifmetric
Get the connection names
nmcli c NAME UUID TYPE DEVICE Wired connection 1 80468912-0922-305a-b845-e038e6a97530 ethernet eth0 DTUdevice 40daedca-0933-4103-87b9-e481d6db6fa4 wifi wlan0 lo 8de6fa00-08f6-4e2d-8251-9db7c4107077 loopback lo mje6 3469ffdb-50a9-4af4-ac8d-2dd6bf1680ab wifi --
The first column is the name. Remember to escape any spaces.
Then change the metric for the cabled network - with a high metric
sudo nmcli c mod Wired\ connection\ 1 ipv4.route-metric 52
And the same for the Wi-Fi network - with a lower metric
sudo nmcli c mod DTUdevice ipv4.route-metric 22 sudo nmcli c mod mje6 ipv4.route-metric 23
Restart NetworkManager
sudo systemctl restart NetworkManager.service
Check default connection with
ip route default via 10.197.208.1 dev wlan0 proto dhcp src 10.197.215.135 metric 24 10.197.208.0/21 dev wlan0 proto kernel scope link src 10.197.215.135 metric 24 192.168.7.0/24 dev eth0 proto kernel scope link src 192.168.7.4 metric 56
Now the default is wlan0, with the best metric.
