[Bug 890189] Re: `restart networking` does not deconfigure an interface

[Steve Langasek]

> And, last but not least. It's Ubuntu's decision to implement
> upstart, please do that the right way without introducing
> regressions.

A change in behavior is not a regression.  The supported way to bring
the interfaces down and up again is to use 'ifup' and 'ifdown', not to
use the init script or upstart job.

This bug is still marked incomplete because you've described a problem
with trying to add duplicate routes that I can't account for.
restarting the network, by any of the above means, should not result in
such an error.

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https://bugs.launchpad.net/bugs/890189

Title:
  `restart networking` does not deconfigure an interface

Status in “ifupdown” package in Ubuntu:
  Incomplete

Bug description:
  The old /etc/init.d/networking script deconfigured all the interfaces
  defined in /etc/network/interfaces. By running `/etc/init.d/networking
  restart`, one could make sure that all the old addresses and routes
  were removed. The replacementscript for upstart doesn't do anything to
  deconfigure an interface. So if you restart networking, a second
  default route can be added. Which isn't what you'd expect.

  Furthermore, the exitcode always seems to be '0', eventhough ifup
  presents errors.

  root at vps9124:/etc/init# /etc/init.d/networking restart
   * Reconfiguring network interfaces...                                                                                                                               SIOCADDRT: File exists
  Failed to bring up eth0.
                                                                                                                                                                [ OK ]
  root at vps9124:/etc/init# echo $?
  0

  root at vps9124:/etc/init# lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 10.04.3 LTS
  Release:	10.04
  Codename:	lucid

  
  IMHO, this is unexpected and unwanted behaviour..

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