hostnamectl; # tested on
Static hostname: workstation
Operating System: Debian GNU/Linux 13 (trixie)
Kernel: Linux 6.12.30-amd64
Architecture: x86-64
# theoretical lowest possible value 0 (highest priority) and highest possible value 4294967295 (hex 0xffffffff, guint32 (unsigned 32-bit integer, lowest priority) for route metric
nmcli connection show
NAME UUID TYPE DEVICE
enp4s0 a126beef-91ee-47f5-aa48-xxxxxxxxxxxx ethernet enp6s0 <- the LAN connection
AndroidHotSpot 55a62192-5394-4b70-97bf-xxxxxxxxxxxx wifi wlx08beac29f632 <- EDIMAX the only USB WIFI dongle that works out of the box on 99% of all GNU Linux
lo 7db0dbdd-1e5b-4a5a-b8c9-xxxxxxxxxxxx loopback lo
virbr0 d7ec5235-3cb9-472d-bc31-xxxxxxxxxxxx bridge virbr0 <- from kvm virtualization
vnet0 1d784698-2fed-4142-bf2f-xxxxxxxxxxxx tun vnet0
vnet6 28c1cb32-755e-4c95-8d7d-xxxxxxxxxxxx tun vnet6
# theoretically this should work, it gives no error
# but it also does not change anything (metric = priority stays the same = does not work)
nmcli connection modify AndroidHotSpot ipv4.route-metric 50; # the lower the value the higher the priority
route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 100 0 0 enp6s0 <- there are two default routes this one (LAN) has higher priority
default _gateway 0.0.0.0 UG 800 0 0 wlx08beac29f632 <- this is the WIFI WLAN with higher metric = less prority
10.109.227.0 0.0.0.0 255.255.255.0 U 800 0 0 wlx08beac29f632
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 enp6s0
192.168.15.0 0.0.0.0 255.255.255.0 U 100 0 0 enp6s0
# get to know the ip of the new default router
# check what is the ip of the gateway
traceroute 1.1.1.1
traceroute to 1.1.1.1 (1.1.1.1), 30 hops max, 60 byte packets
1 _gateway (10.109.227.53) 5.543 ms 5.513 ms 5.605 ms <- it is this one
# also note that this system will most likely lose internet connection in the process!
ip route del default; # delete the default route (highest in list = highest priority will be deleted first)
route; # route with higher metric via enp6s0 is gone
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 800 0 0 wlx08beac29f632
10.109.227.0 0.0.0.0 255.255.255.0 U 800 0 0 wlx08beac29f632
192.168.15.0 0.0.0.0 255.255.255.0 U 100 0 0 enp6s0
ip route change default via 10.109.227.53 dev wlx08beac29f632; # complains with = does not work
RTNETLINK answers: No such file or directory
ip route del default; # repeate until there is no more default route
ip route add default via 10.109.227.53 dev wlx08beac29f632 metric 50; # readds WIFI device as new default route with high priority (low metric value)
route; # this time changing metric worked
# please note that this is only temporarily (does not survive reboot)
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default _gateway 0.0.0.0 UG 50 0 0 wlx08beac29f632
10.109.227.0 0.0.0.0 255.255.255.0 U 800 0 0 wlx08beac29f632
192.168.1.0 0.0.0.0 255.255.255.0 U 100 0 0 enp6s0
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