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

[Steve Langasek]

/etc/init/networking.conf is from the ifupdown package, not from
upstart.  Reassigning.

> So if you restart networking, a second default route can be added. Which isn't
> what you'd expect.

"ifup -a" for an interface that's already known by ifupdown to be up
should have no effect.  Is there some reason that your interface is
failing to be configured the first time around, resulting in such a
double route?

In general, it would be recommendable to use the 'ifup' and 'ifdown'
commands directly to manipulate interfaces, instead of toggling them
with either '/etc/init.d/networking restart' or 'restart networking'.

** Package changed: upstart (Ubuntu) => ifupdown (Ubuntu)

** Changed in: ifupdown (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: ifupdown (Ubuntu)
       Status: New => Incomplete

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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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