script
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# Install the ifmetric
sudo apt-get install ifmetric
# List the metric of interface
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.42.0.1 0.0.0.0 UG 100 0 0 eth0
0.0.0.0 10.42.0.2 0.0.0.0 UG 600 0 0 wlan0
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# Set preferred interface with lower metric
sudo ifmetric wlan0 50
# List the metric of interface
route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.42.0.2 0.0.0.0 UG 50 0 0 wlan0
0.0.0.0 10.42.0.1 0.0.0.0 UG 100 0 0 eth0
