How to select the network interface if there are multiples in ubuntu?

ref: https://www.cyberciti.biz/faq/ip-route-add-network-command-for-linux-explained/

ip route add {NETWORK/MASK} via {GATEWAYIP}
ip route add {NETWORK/MASK} dev {DEVICE}
ip route add default {NETWORK/MASK} dev {DEVICE}
ip route add default {NETWORK/MASK} via {GATEWAYIP}




For example, if there are multiple vlan, we can force the route to use a particular interface

For example, if you want to access vlan 192.168.2.0/24, you can do:

sudo ip route add 192.168.2.0/24 via 192.168.1.1 dev enp4s0

If you have another vlan 192.168.10.0/24 you want to access, you can do

sudo ip route add 192.168.10.0/24 via 192.168.1.1 dev enp4s0