If you're on the 10.40.24.0 network, the route target would be 10.40.24.250. If you're on the 10.40.28.0 network, it's 10.40.28.250, and so on. The 10.40.28.0 network is used in this experiment.   Edit the /etc/netplan/01-netcfg.yaml file. Here is an example from skayal.com. network: version: 2 renderer: networkd ethernets: eth0: addresses: [ 10.40.28.108/24 ] gateway4: 10.40.28.1 nameservers: search: [ skayal.com ] addresses: - 208.82.128.10 - 208.82.128.2 routes: - to: 10.10.0.0/16 via: 10.40.28.250 - to: 10.20.0.0/16 via: 10.40.28.250   Save your changesnetplan tryYou should see the routes...