netdev - Re: PROBLEM: IPv6 autoconf/accept

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Message-Id: <20090319.234446.242594797.davem@davemloft.net>
Date:	Thu, 19 Mar 2009 23:44:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	yoshfuji@...paulia.net
Cc:	linux@...la.no, netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: PROBLEM: IPv6 autoconf/accept_ra default values

From: YOSHIFUJI Hideaki <yoshfuji@...paulia.net>
Date: Wed, 18 Mar 2009 12:33:08 +0900 (JST)

> In article <alpine.LNX.2.00.0903180200590.10453@...da.kolla.no> (at Wed, 18 Mar 2009 02:06:09 +0100 (CET)), Kolbjørn Barmen <linux@...la.no> says:
> 
> > > My personal oppinion is that anything ipv6 autoconfig/accept_ra should be
> > > default _off_, since this simplifies all the above mentioned issues, and
> > > it is incredibly easy to turn on again with systcl if people want it.
> > > It is much easier to enable ipv6 automagic than to disable it.
> > > At least there should be kernel/module parameter to set default behaviour.
> > > 
> > > Part of the problem with deploying IPv6 is due to "magic" like this, all
> > > the autoconfig/router announcement magic looks very well on paper and in
> > > theory, but out in the field it quickly leads to loads of totally
> > > unnecessary extra work, work that could easily be avoided if default
> > > behaviour was to have it off. It should be in the interest of IPv6
> > > advocates to support a "soft" transition from IPv4-only to dual-stack,
> > > fencing off unwanted "magic" only adds to the frustration for those who
> > > actually try to deploy it.
> > > 
> > > What do you think?
> > 
> > Obviously noone really think much of this, one way or the other, so here's a
> > patch that changes the default values.
> 
> Default should be ON.

I absolutely agree.

It can't be called autoconfiguration if it's off by default, and
you have to "configure" something.

What are people smoking? :-)

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