netdev - Re: Re: Re: IPv4 / IPv6 over IPv4 IPsec tunnel: setting the DF bit

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Message-ID: <20140131150143.GJ25336@order.stressinduktion.org>
Date:	Fri, 31 Jan 2014 16:01:43 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Simon Schneider <simon-schneider@....net>
Cc:	netdev@...r.kernel.org
Subject: Re: Re: Re: IPv4 / IPv6 over IPv4 IPsec tunnel: setting the DF bit

On Fri, Jan 31, 2014 at 09:27:27AM +0100, Simon Schneider wrote:
> I think your IPv6 related statements are for a IPv6-over-IPv6 case.
>  
> However, I'm especially after the IPv6-over-IPv4 case.
>  
> In that case, you cannot copy the DF bit from the inner IPv6 packet.
>  
> But you still have the option to set or not set the DF bit in the IPv4 outer packet.
>  
> How is that decided?

Basically only pmtudisc setting is cruical then. So no DF-bit if nopmtudisc
and DF-bit if pmtudisc.

Greetings,

  Hannes

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