Linux command: route

Show routing table:

route -n

Delete route:

route del -net 10.0.0.0 netmask 255.0.0.0 gw 192.168.1.254 eth0

Add route:

route add -net 15.17.160.0/20 gw 15.17.160.1 metric 10 eth0

Add permanent route

nano /etc/network/interfaces:

auto eth0
iface eth0 inet static
      address 192.168.1.2
      netmask 255.255.255.0
      up route add -net 192.168.0.0 netmask 255.255.0.0 gw 192.168.1.1
      up route add -net 172.16.0.0 netmask 255.240.0.0 gw 192.168.1.1

routes.sh

sudo route del -net 0.0.0.0 gw 15.17.160.1 netmask 0.0.0.0 enp9s0
sudo route add -net 20.1.40.0 netmask 255.255.255.0 gw 15.17.160.1
sudo route add -net 22.0.0.0 netmask 255.255.0.0 gw 15.17.160.1 enp9s0
sudo ip r a 20.1.30.0/24 via 15.17.160.1 dev enp9s0

fixroute script

match=$(route -n | awk '{print $1 " " $2}' | grep '0.0.0.0 172.27.0.1')

if [ ! -z "$match" ]; then
    sudo route del -net 0.0.0.0 netmask 0.0.0.0 gw 172.27.0.1 enp0s25 >> /tmp/fixroute.log
    echo "\033[1;32m Removed route from routing table \033[0;00m"
    sudo route -n
else
    echo "\033[1;31m Route not found: -net 0.0.0.0 netmask 0.0.0.0 gw 172.27.0.1 enp0s25 \033[0;00m"
    sudo route -n
fi