netdev - Re: [PATCH] ipv6: add special mode accept_ra=2 to accept RA while configured as router

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Date:	Fri, 03 Sep 2010 09:43:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...radead.org
Cc:	netdev@...r.kernel.org, yoshfuji@...ux-ipv6.org
Subject: Re: [PATCH] ipv6: add special mode accept_ra=2 to accept RA while
 configured as router

From: Thomas Graf <tgraf@...radead.org>
Date: Fri, 3 Sep 2010 08:59:14 -0400

> The current IPv6 behavior is to not accept router advertisements while
> forwarding, i.e. configured as router.
> 
> This does make sense, a router is typically not supposed to be auto
> configured. However there are exceptions and we should allow the
> current behavior to be overwritten.
> 
> Therefore this patch enables the user to overrule the "if forwarding
> enabled then don't listen to RAs" rule by setting accept_ra to the
> special value of 2.
> 
> An alternative would be to ignore the forwarding switch alltogether
> and solely accept RAs based on the value of accept_ra. However, I
> found that if not intended, accepting RAs as a router can lead to
> strange unwanted behavior therefore we it seems wise to only do so
> if the user explicitely asks for this behavior.
> 
> Signed-off-by: Thomas Graf <tgraf@...radead.org>

Applied.
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