How to reload /etc/network/interfaces in Ubuntu or Debian

In Ubuntu or Debian, information on network interface configuration is stored in /etc/network/interfaces. If you modify /etc/network/interfaces to reconfigure any interface, you need to reload it so that the new configuration can take effect.

Here is how you can reload /etc/network/interfaces.

sudo service networking restart

One caveat: If NetworkManager is installed and enabled on your system, it will interfere with you reloading /etc/network/interfaces. On Ubuntu Desktop, for example, NetworkManager is enabled by default. Thus you first need to disable NetworkManager before attempting to reload /etc/network/interfaces.

To disable NetworkManager, do the following.

$ sudo service network-manager stop
$ sudo update-rc.d NetworkManager remove

If you don't want to disable NetworkManager, another option is to edit NetworkManager configuration, and add "managed=false" as follows. Then, restart NetworkManager.

$ sudo vi /etc/NetworkManager/NetworkManager.conf
[ifupdown]
managed=false
$ sudo service network-manager restart

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