netdev - Re: net.ipv6.conf.INT.accept_ra_rt_info_max

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Date:	Mon, 02 Feb 2009 21:36:16 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	pekkas@...core.fi
Cc:	netdev@...r.kernel.org, sega01@...il.com
Subject: Re: net.ipv6.conf.INT.accept_ra_rt_info_max_plen defaults to 0

From: Pekka Savola <pekkas@...core.fi>
Date: Tue, 3 Feb 2009 06:38:49 +0200 (EET)

> As reported and discussed below and in
> <http://www.mail-archive.com/debian-ipv6@lists.debian.org/msg03753.html>,
> to accept "route information option" on Linux, you have to manually
> change accept_ra_rt_info_max_plen sysctl value.  Other
> implementations that I know of accept this by default.
>
> Is it intentional that Route Information options are ignored by default?
>
> I suspect not -- if so, the default value should be (IMHO) 64 or if
> that's disagreeable, 48.
> 
> Even if this is intentional, I think the intentions should be revisited.

It looks very intentional, both via the code and it's documentation
in ip-sysctl.txt

It seems that it is disabled like this by default when
accept_ra_rtr_pref is enabled, and that seems pretty reasonable to me.

I'm sure whoever made that decision didn't do so on a whim and had
a very good reason for it.
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