Date: Fri, 9 Feb 2007 13:49:08 -0800 From: Jeremy Chadwick <koitsu@FreeBSD.org> To: Kevin Way <kevin@insidesystems.net> Cc: freebsd-stable@freebsd.org Subject: Re: Desired behaviour of "ifconfig -alias" Message-ID: <20070209214908.GA64090@icarus.home.lan> In-Reply-To: <45CCE270.7080704@insidesystems.net> References: <45CCE270.7080704@insidesystems.net>
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On Fri, Feb 09, 2007 at 04:06:56PM -0500, Kevin Way wrote: > I recently ran into a bug in the jail startup scripts that caused this > command to be executed: > > ifconfig bce0 -alias > > It turns out that this command eliminated the primary IP for the device. > > man ifconfig defines the behavior of -alias to be: > > -alias Remove the network address specified. This would be used > if you > incorrectly specified an alias, or it was no longer needed. If > you have incorrectly set an NS address having the side > effect of > specifying the host portion, removing all NS addresses will > allow > you to respecify the host portion. > > > I can't help but wonder if it would be better behavior to throw an error > when no > argument is supplied. > > The only discussion I found of this in a quick search of the archives > was a post in > 2004 which noted that the fxp driver actually deletes all IP addresses, > but there was > no significant follow-up. > > Should ifconfig throw an error if no address is supplied? My vote is for either 1) an error, or 2) delete all of the aliases associated with that interface. If I had a preference, I'd choose #1. I'd argue that -alias doing what you described (removing the non-aliased IP bound to the iface) when no inet/inet6 arguments are suppied is indeed a bug. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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