[165240] in North American Network Operators' Group
Re: IP Fragmentation - Not reliable over the Internet?
daemon@ATHENA.MIT.EDU (Valdis.Kletnieks@vt.edu)
Tue Aug 27 10:41:53 2013
To: Owen DeLong <owen@delong.com>
In-Reply-To: Your message of "Tue, 27 Aug 2013 00:34:57 -0700."
<5DEF4DE9-3680-4D47-9FF0-1FC3CED0A816@delong.com>
From: Valdis.Kletnieks@vt.edu
Date: Tue, 27 Aug 2013 10:33:21 -0400
Cc: North American Network Operators' Group <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Tue, 27 Aug 2013 00:34:57 -0700, Owen DeLong said:
> That's a lot of questions he didn't ask.
This isn't your first rodeo. You should know by now that the question
actually asked, the question *meant* to be asked, and the question that
actually needed answering are often 3 different things.
> If I send a packet out as a legitimate series of fragments, what is the chance
> that they will get dropped somewhere in the middle of the path between the
> emitting host and the receiving host?
> To my thinking, the answer to that question is basically "pretty close to 0 and
> if that changes in the core, very bad things will happen."
Saku Ytti and Emile Aben have numbers that say otherwise. And there must
be a significantly bigger percentage of failures than "pretty close to 0",
or Path MTU Discovery wouldn't have a reputation of being next to useless.
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