cemeyer / python-change-NM-dns

Change NetworkManager DNS servers from the command line

About

Tiny python script to change NetworkManager DNS servers via the DBus interface.

Example

$ sudo ./nm_change_dns.py 127.0.0.1
Current configuration:
8.8.8.8
8.8.4.4
New configuration:
127.0.0.1
Apply change? [y/N] y

$ dbus-send --system --print-reply --dest=org.freedesktop.NetworkManager \
  /org/freedesktop/NetworkManager/Settings/0 \
  org.freedesktop.NetworkManager.Settings.Connection.GetSettings | \
  grep dns -B1 -A5

        dict entry(
           string "dns"
           variant                   array [
                 uint32 16777343
              ]
        )

$ export X=16777343
$ echo "$((X%256)).$(((X>>8)%256)).$(((X>>16)%256)).$((X>>24))"
127.0.0.1

Credits

Derived from this article's code: http://www.kernelcrash.com/blog/updating-networkmanager-via-the-command-line/2012/04/01/