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Date:	Tue, 20 Dec 2011 08:18:43 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>
Cc:	timo.teras@....fi, netdev@...r.kernel.org
Subject: Re: linux-3.0.x regression with ipv4 routes having mtu

On Tue, Dec 20, 2011 at 02:03:55AM -0500, David Miller wrote:
> From: Timo Teräs <timo.teras@....fi>
> Date: Tue, 20 Dec 2011 08:53:09 +0200
> 
> > Or maybe I missed the place where that updated would happen?
> 
> It should happen on every routing cache lookup hit just like we
> validate the peer for redirect information.

The problem is that we need to do a route cache lookup to
validate the peer informations. This does not happen if
somebody adds a new route. I tried already to add a pmtu specific
generation id and it appears to not solve the problem. We would
still need to overwrite the cached value if we add a route with mtu.
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