Ubuntu Core 16 - Change MTU of a network connection permanently using Network Manager

I have a Dell Gateway System (GW3001) running Ubuntu Core 16. This system supports cellular interface and uses NetworkManager to manage the network interfaces. I want to find out how to permanently change the MTU value of the cellular connection from the default value of 1500. I have tried changing it through nmcli editor but the change does not get reflected when I run “ifconfig” command. Any help would be really appreciated.


I’ve worked with the same device and I’ve found that, when you make some cellular’s configurations sometimes it’s necessary not only to power it off but to unplug it out from energy for changes to be detected.

It is not impossible that you are hitting apparmor confinement rules. Take a look at dmesg output and see if there are apparmor denials there after running nmcli.