Desired behaviour of "ifconfig -alias"

Kevin Way kevin at
Mon Feb 12 23:26:40 UTC 2007

Oliver Fromme wrote:
> But you called it "confusing".  That's just your personal
> perception.  It doesn't mean it is confusing to everybody.
If asked what -alias does, would you really reply "it removes the
primary IP,
while leaving the alias?"  Be honest here.

>  Also note that it doesn't hurt anybody.  

If you run RELENG_6_2, and a jail fails to start, this command is  called. 
And instead of unaliasing the jail's alias, it (because of a bug in the
rc.d scripts), it removes the primary IP.

So that is a real life, non-third-party incident, where a machine was
off-line unexpectedly, because of this behavior.  Sure, it didn't *hurt*
but knocking a machine off-line is a pretty serious side effect,
especially when
it isn't documented.

Errors in the other direction are more likely to result in a machine

Fortunately, it appears that a fairly strong consensus is appearing in
of an eventual refinement of this behavior.

Best Regards,
Kevin Way

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