Subject: Re: linux-3.0.x regression with ipv4 routes having mtu

From: Steffen Klassert <[email-masked]>
Date: Tue, 20 Dec 2011 08:18:43 +0100

On Tue, Dec 20, 2011 at 02:03:55AM -0500, David Miller wrote:
> From: Timo Teräs <[email-masked]>
> 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.