netdev - Re: linux 3.13: problems with isatap tunnel device and UFO

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Message-ID: <20140207175641.GB16198@order.stressinduktion.org>
Date:	Fri, 7 Feb 2014 18:56:41 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Wolfgang Walter <linux@...m.de>
Cc:	netdev@...r.kernel.org
Subject: Re: linux 3.13: problems with isatap tunnel device and UFO

Hi!

On Fri, Feb 07, 2014 at 06:47:07PM +0100, Wolfgang Walter wrote:
> with kernel 3.13 I have a problem with isatap tunnels receiving fragmented 
> ipv6 udp packets.

Which was the last known version that did work? Also dropwatch and nstat could
give a first hint.

> If I switch of ufo for the tunnel device the problem disappears:
> 	ethtool -K is0 ufo off
> 
> When UFO is on tcpdump shows the packets on the physical device but not on the 
> tunnel device. The packets seem to be discarded.
> 
> With UFO off I can see them on is0 (and the packet is delivered to the 
> socket).

Thanks for the report, I'll look at it.

Greetings,

  Hannes

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