netdev - Re: [PATCH v2 2/2] ipv6: Allow accepting RA from local IP addresses.

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Date:	Fri, 27 Jun 2014 08:24:13 +0200
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	YOSHIFUJI Hideaki/吉藤英明 
	<hideaki.yoshifuji@...aclelinux.com>
Cc:	Ben Greear <greearb@...delatech.com>,
	YOSHIFUJI Hideaki <hideaki@...hifuji.org>,
	netdev@...r.kernel.org, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH v2 2/2] ipv6:  Allow accepting RA from local IP
 addresses.

Hello!

On Do, 2014-06-26 at 09:49 +0900, YOSHIFUJI Hideaki/吉藤英明 wrote:
> >> (2014/06/25 6:14), greearb@...delatech.com wrote:
> >>> From: Ben Greear <greearb@...delatech.com>
> >>>
> >>> This can be used in virtual networking applications, and
> >>> may have other uses as well.  The option is disabled by
> >>> default, so no change to current operating behaviour
> >>
> >>                                     standard compliant behavior?
> >
> > I've no idea.  Can you point me to the proper standard (and
> > pertinent section)?
> 
> I was wrong.
> 
> I found this code was added by commit 9f56220 ("ipv6: Do not
> use routes from locally generated RAs") to fix behavior when
> accept_ra == 2.
> 
> But I do not understand why it is not enough to restrict local
> address on receiving interface.
> 
> Andi, would you explain?

Wouldn't we alter existing behaviour in case someone connects several
NICs in a router to the same network while only running radvd on one
interface. Additional addresses would show up where prior none would
have.

I am in favor of checking all addresses in the current namespace.

Greetings,
Hannes


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