linux-kernel - Re: [PATCH v3] net: sysctl for RA default route MTU

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Message-Id: <1427381341.2801675.245582457.5499DAED@webmail.messagingengine.com>
Date:	Thu, 26 Mar 2015 15:49:01 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Roman Gushchin <klamm@...dex-team.ru>, netdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v3] net: sysctl for RA default route MTU

On Thu, Mar 26, 2015, at 12:49, Roman Gushchin wrote:
> This patch introduces new ipv6 sysctl: ra_default_route_mtu.
> If it's set (> 0), it defines per-route MTU for any new default route
> received by RA.
> 
> This sysctl will help in the following configuration: we want to use
> jumbo-frames for internal networks and default ethernet frames for
> default route. Per-route MTU can only lower per-link MTU, so link MTU
> should be set to ~9000 (statically or via RA).
> 
> Due to dynamic nature of RA, setting MTU for default route will require
> userspace agent, that will monitor changes of default route
> and (re)configure it. Not simple. The suggested sysctl solves this
> problem.
> 
> Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Thanks!
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