Sorry for the delay, this bug should have been triaged to ifupdown instead of netbase...
Anyway, there's sadly no way for ifupdown to know to kill dhclient AFTER you changed the entry in /etc/network/interfaces. However, running /etc/init.d/networking stop, then changing it, then doing /etc/init.d/networking start should work (or else, it's an actual bug). ** Changed in: netbase (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/174230 Title: /etc/init.d/networking stop/start or restart does not stop/start dhclient. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/netbase/+bug/174230/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs