netdev - RE: [PATCH v3] iproute2: add support for GRE ignore-df knob

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Date:   Wed, 13 Sep 2017 03:56:56 +0000
From:   Michele Lucini <mlucini@...earea.com.au>
To:     Philip Prindeville <philipp@...fish-solutions.com>,
        Stephen Hemminger <stephen@...workplumber.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v3] iproute2: add support for GRE ignore-df knob

Guys, thanks heaps for this, much appreciated!

Cheers.

Mike
-----Original Message-----
From: Philip Prindeville [mailto:philipp@...fish-solutions.com] 
Sent: Friday, 21 July 2017 10:35 AM
To: Stephen Hemminger <stephen@...workplumber.org>
Cc: netdev@...r.kernel.org; Michele Lucini <mlucini@...earea.com.au>
Subject: Re: [PATCH v3] iproute2: add support for GRE ignore-df knob


> On Jul 20, 2017, at 6:26 PM, Stephen Hemminger <stephen@...workplumber.org> wrote:
> 
> On Thu, 20 Jul 2017 13:06:10 -0600
> "Philip Prindeville" <philipp@...fish-solutions.com> wrote:
> 
>> 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.
>> 
>> The workaround is to handle IPv4 payloads opaquely, ignoring the DF 
>> bit.
>> 
>> Kernel commit 22a59be8b7693eb2d0897a9638f5991f2f8e4ddd ("net: ipv4:
>> Add ability to have GRE ignore DF bit in IPv4 payloads") is 
>> complemented by this user-space changeset which exposes control of 
>> this setting.
>> 
>> Reviewed-by: Stephen Hemminger <stephen@...workplumber.org>
>> Signed-off-by: Philip Prindeville <philipp@...fish-solutions.com>
> 
> Applied, thanks Philip


Thanks!  Sorry I didn’t realize that the first submission a year ago hadn’t been applied and it took me this long to redux and resubmit it.

Michele: hopefully this comes out in your distro-of-choice fairly soon.  Like I said, I thought this had already been rolled in.

-Philip