Ubuntu – How to toggle NetworkManager’s “Use this connection only for resources on its network” option via command line

17.04bashnetwork-managernmclirouting

At my work we have some test machines that we run scripts on via ssh. During the test we want to only have the machines access the local network through their Ethernet connection, but then would like to have them be able to access the Internet through the same interface for cleanup and data transmission after.

We can do this by going to each machine and toggling the "Use this connection only for resources on its network" option in the network manager > IPv4 options > routes menu, but it would be a lot more convenient to be able to add this into our test script.

I can find some similar questions that have to do with VPN connections, but I want to make sure I handle the routing correctly for the regular Ethernet interface. Thanks for any help.

Best Answer

You can use nmcli to do it, the key is ipv4.never-default:

nmcli connection modify enp3s0 ipv4.never-default true

change enp3s0 with your own connection name.
use false or true to toggle between this config.

Related Solutions

Ubuntu – Vpn client routing when “use this connection only for resources on its network” is checked

You can add default gateway with command

by the ip address

sudo ip route add default via xxx.xxx.xxx.xxx

xxx.xxx.xxx.xxx - represent ip of vpn server

or by interface

sudo ip route add default dev ppp0

This can be done manually from terminal when you are connected to vpn.

Second solution is to make script to chance default gw when vpn is connected

Then create script witch will be executed when interface ppp0 go up.

Create script for ppp0 interface

sudo nano /etc/ppp/if-up.d/script

put in script this

    # Check for specific interface if desired
    [ "$IFACE" != "ppp0" ] || exit 0
    # trigger vpn connection
    ip route add default dev ppp0

Save and exit.

Make script called script with execute permissions 755

sudo chmod 755 /etc/network/if-up.d/script

Explanation

When vpn connection will established and ppp0 interface is up script will run and set default device to ppp0

Also you can manually add route to resource on vpn site

sudo ip route add xxx.xxx.xxx.xxx/yy dev ppp0

xxx.xxx.xxx.xxx - represent host/network

yy - represent network mask

example:

add route to host 10.35.5.181 trough ppp0

 sudo ip route add 10.35.5.181/32 dev ppp0

add route to network range 10.35.5.0 with mask 255.255.255.0 trough ppp0

 sudo ip route add 10.35.5.0/24 dev ppp0

This also can be done in Network Manager. On same places where is use this connection only for resources on its network you can add route.

Ubuntu – Allow only network connections but not connect to internet

You can use the ip command for setting up routes. You basically need to remove your default route. At make sure you have a route entry into your local network.

Best Answer

Related Solutions

Ubuntu – Vpn client routing when “use this connection only for resources on its network” is checked

Ubuntu – Allow only network connections but not connect to internet

Related Question