Two network interfaces on ubuntu

default gateway linux routing

Ref

  • https://www.ni.com/en-vn/support/documentation/supplemental/11/best-practices-for-using-multiple-network-interfaces–nics–with.html

Usage case

  • Have two network interfaces on my PC: 1 to local network (eno1) and 1 to public network (enx_fe) as above
  • Want to use eno1 for local trafic and enx_fe for internet access

solution

  • Delete local defaul gateway + add route for local network
$ sudo ip route del default via 10.150.124.1 dev eno1
$ sudo route add -net 10.0.0.0/8 gw 10.150.124.1 dev eno1
  • This means that: use eno1 for trafic on 10.0.0.0/8 network and enx_fe for all others