netdev - Re: [PATCH net-next] net: ipv4: Add ability to have GRE ignore DF bit in IPv4 payloads

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Message-Id: <59274155-ED76-420B-A1F1-667DDCF6CB49@redfish-solutions.com>
Date:	Mon, 13 Jun 2016 12:59:31 -0600
From:	Philip Prindeville <philipp@...fish-solutions.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, stephen@...workplumber.org
Subject: Re: [PATCH net-next] net: ipv4: Add ability to have GRE ignore DF bit in IPv4 payloads


> On Jun 11, 2016, at 12:02 AM, David Miller <davem@...emloft.net> wrote:
> 
> From: "Philip Prindeville" <philipp@...fish-solutions.com>
> Date: Tue,  7 Jun 2016 13:48:46 -0600
> 
>> From: Philip Prindeville <philipp@...fish-solutions.com>
>> 
>> In the presence of firewalls which improperly block ICMP Unreachable
>> (including Fragmentation Required) messages, Path MTU Discovery is
>> prevented from working.
>> 
>> A workaround is to handle IPv4 payloads opaquely, ignoring the DF bit--as
>> is done for other payloads like AppleTalk--and doing transparent
>> fragmentation and reassembly.
>> 
>> Reviewed-by: Stephen Hemminger <stephen@...workplumber.org>
>> Signed-off-by: Philip Prindeville <philipp@...fish-solutions.com>
> 
> I think the feedback that this feature should be mutually exclusive
> to pmtudisc is valid and you should address that.

Yes, understood.  Looking into this.

-Philip


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