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Changing_Network_Connection_Priority.md

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Changing Connection Priorities Linux

Sometimes easy to use nm-connection-editor gui is not available in repos, so CLI option to be used

Check existing priorities

nmcli connection show
NAME                    UUID                                  TYPE       DEVICE          
khan 5G_Plus            15ef0c5f-4ae3-4607-b1d2-a338b2189626  wifi       wlan0           
khan 5G_Plus_5G         3da1190f-bc16-40bf-84a5-18be8f87b483  wifi       wlx90de8017e3ad 
Usama's S23 FE Network  96f0f868-9c0c-427e-818d-fe5dc2292851  bluetooth  --              
Wired connection 1      82b4e4d6-300e-39ca-871d-dc814651e5e4  ethernet   --

if you have netplan installed (preinstalled in Armbian) your network names will have some netplan prefix.

ukhan@radxa-zero3:~$ nmcli connection show
NAME                                  UUID                                  TYPE      DEVICE
netplan-wlx90de8017e3ad-khan 5G_Plus  c8bfa654-b142-31de-bbc0-6f96819f577d  wifi      wlx90de8017e3ad
netplan-wlx90de80ea18d5-khan          c826ec95-8343-3e5c-adfc-a27c6391c6d6  wifi      wlx90de80ea18d5
tailscale0                            8875de67-3fcd-4056-8608-afa99045dfa5  tun       tailscale0
br-5ad81b4dfa83                       83b35aee-cf1d-4346-a36c-c3c18318c9d7  bridge    br-5ad81b4dfa83
docker0                               28ce79ab-40b1-466e-8c6b-34f2e393d2c1  bridge    docker0
lo                                    6eeccb25-b4f5-4cba-a137-bdc9139453ef  loopback  lo
netplan-end1                          e659fd80-ec36-30f4-974a-2c16fc6cc0bc  ethernet  --

Modifying priority

Modifying via nmcli is less preferred Most likely its preinstalled if not sudo apt install ifmetric The interface with lower metric is preferred for Internet. The following file has a problem. There are duplicate metric of 200

ukhan@radxa-zero3:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    200    0        0 wlx90de8017e3ad
0.0.0.0         192.168.1.1     0.0.0.0         UG    200    0        0 wlx90de80ea18d5
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 br-5ad81b4dfa83
192.168.1.0     0.0.0.0         255.255.255.0   U     102    0        0 wlx90de8017e3ad
192.168.1.0     0.0.0.0         255.255.255.0   U     601    0        0 wlx90de80ea18d5

If such a situation exists cd /etc/netplan & verify any duplicate yaml files. More about this In my case I deleted all except x2 00-default-use-network-manager.yaml & armbian.yaml I edited the latter to set metrics directly (200 & 400) & rebooted. Correct one is as follows

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    200    0        0 wlx90de8017e3ad
0.0.0.0         192.168.1.1     0.0.0.0         UG    400    0        0 wlx90de80ea18d5
172.17.0.0      0.0.0.0         255.255.0.0     U     0      0        0 docker0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 br-5ad81b4dfa83
192.168.1.0     0.0.0.0         255.255.255.0   U     600    0        0 wlx90de80ea18d5
192.168.1.0     0.0.0.0         255.255.255.0   U     601    0        0 wlx90de8017e3ad

GUI way

https://superuser.com/a/1701437