netdev - Re: [RFC PATCH net-next] ipv6: stop sending PTB packets for MTU

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Message-ID: <CAPh34me0MTgr_RDsZt+3tCZQaoKWk+dRsyt_Mj0fENFPS_GF_w@mail.gmail.com>
Date:	Tue, 26 Aug 2014 10:06:03 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	netdev <netdev@...r.kernel.org>,
	Fernando Gont <fgont@...networks.com>
Subject: Re: [RFC PATCH net-next] ipv6: stop sending PTB packets for MTU < 1280

On 26 August 2014 00:47, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:

Hey Hannes

> I wonder if we should wait until this gets RFC status?

Yes, we should wait until we get Fernando's go (based on v6ops
discussion & consensus). But the discussions seem to boils down to
this action (remove IPv6 PTB generation < 1280). If so we probably
don't want to wait two years with an open "protocol bug".

> I very much welcome this decision! I already raised this problem some
> time ago:
> http://lists.openwall.net/netdev/2013/12/31/17

Thank you for the pointer

> I wonder if we should add a mode alike ipv4 ip_no_pmtu_disc mode for
> ipv6:

Not sure, we should discuss this here (netdev). I tend to remove the
functionality completely. Any use cases where it makes sense to keep
this?

> This patch is a starter, yes. We can now get rid of the dst_allfrag
> function altogether.

Yes right, I am aware of this. Depending on the discussion we should
get rid of the allfrags code or not. Let's see. Thank you Hannes for
the comments.

Hagen
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