Bug#525012: ifconfig fails to initialize a virtual interface with a zero IP address
ifconfig seem to not be able anymore to "deconfigure" a virtual interface.
The Official Manual example  in the section 10.6.1.7 does not work anymore
because of this.
# ifconfig eth0:1 inet 0 up
does not work anymore
As noted in  (which is the same bug of this in the ubuntu's bts) I think
that dhcp3-client's important bug #275653 is caused by this bug too, so I CC
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