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Date:	Thu, 30 Jan 2014 15:21:16 +0100
From:	Hannes Frederic Sowa <>
To:	Simon Schneider <>
Subject: Re: IPv4 / IPv6 over IPv4 IPsec tunnel: setting the DF bit

On Thu, Jan 30, 2014 at 01:25:10PM +0100, Simon Schneider wrote:
> Hi,
> for the scenarios
> - IPv4 over IPv4 IPsec tunnel
> - IPv6 over IPv4 IPsec tunnel
> I wonder how the DF bit of the outer (encrypted) packet is set.
> There are generally three options:
> - DF bit always 0
> - DF bit always 1
> - DF bit copied from inner packet

There is a pmtudisc knob on ip tunnel ... to force DF bit on outgoing packets,
but DF bit should get copied from inner packet up to tunnel header in every



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