netdev - Re: [PATCH net-next] ipv4: introduce new IP_MTU_DISCOVER mode IP_PMTUDISC

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Message-ID: <20131029125058.GB15762@order.stressinduktion.org>
Date:	Tue, 29 Oct 2013 13:50:58 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	fweimer@...hat.com
Subject: Re: [PATCH net-next] ipv4: introduce new IP_MTU_DISCOVER mode IP_PMTUDISC_INTERFACE

On Tue, Oct 29, 2013 at 01:04:25PM +0100, Hannes Frederic Sowa wrote:
> The reason for this is, that __ip_rt_update_pmtu is called with zero mtu
> and will get clamped to min_pmtu. It is possible to tell people to also
> increase min_pmtu but I don't want to take the risk of breaking other
> applications on a DNS server given how the current semantics are.

It is actually difficult to select a reasonable mtu here given more than two
interfaces with different mtus.

Greetings,

  Hannes

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