netdev - Re: [PATCH v3 net-next] net: ipv6: Add sysctl entry to disable MTU updates from RA

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Message-Id: <20150124.231432.1788575004982971514.davem@davemloft.net>
Date:	Sat, 24 Jan 2015 23:14:32 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	harouth@...eaurora.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v3 net-next] net: ipv6: Add sysctl entry to disable MTU
 updates from RA

From: Harout Hedeshian <harouth@...eaurora.org>
Date: Tue, 20 Jan 2015 10:06:05 -0700

> The kernel forcefully applies MTU values received in router
> advertisements provided the new MTU is less than the current. This
> behavior is undesirable when the user space is managing the MTU. Instead
> a sysctl flag 'accept_ra_mtu' is introduced such that the user space
> can control whether or not RA provided MTU updates should be applied. The
> default behavior is unchanged; user space must explicitly set this flag
> to 0 for RA MTUs to be ignored.
> 
> Signed-off-by: Harout Hedeshian <harouth@...eaurora.org>

Under what circumstances would userland ignore a router advertized
MTU, and are the RFCs ok with this?
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