David Miller <da...@davemloft.net> wrote:

[ cc'd Maxime Bizon ]

> From: Florian Westphal <f...@strlen.de>
> Date: Fri, 22 May 2015 16:32:49 +0200
> 
> > IP (ttl 64, id 12345, offset 0, flags [+, DF], proto UDP (17), length 1204)
> >     192.168.7.1.42 > 10.23.42.2.42: UDP, length 1400
> > IP (ttl 64, id 12345, offset 1184, flags [DF], proto UDP (17), length 244)
> >     192.168.7.1 > 10.23.42.2: ip-proto-17
> 
> I almost consider a fragment with DF set an oxymoron.
> 
> How does this happen?

Good question.  I have no idea why or how this happens.

But it does happen, see e.g. following bug report:
http://marc.info/?l=linux-netdev&m=139870308431986&w=2

Maxime, do you recall what type of traffic generates
the DF-fragments you reported?

Thanks.
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