Hi Jeffrey,
This is Thomas Peterson from the InterOperability Laboratory at UNH.
We have done extensive testing in this area and would be happy to work
with you off line to examine this scenario.
If you would like we can even set up your test topology in our lab.
Thanks,
Tom
On Jan 21, 2009, at 2:44 PM, Dunn, Jeffrey H. wrote:
Rémi,
I agree with you assertions concerning "ping" versus TCP; however, I
am looking for some concrete documentation or experiences.
Best Regards,
Jeffrey Dunn
Info Systems Eng., Lead
MITRE Corporation.
(301) 448-6965 (mobile)
-----Original Message-----
From: Rémi Denis-Courmont [mailto:[email protected]]
Sent: Wednesday, January 21, 2009 2:33 PM
To: [email protected]
Cc: Dunn, Jeffrey H.; [email protected]; [email protected];
Sherman, Kurt T.; Liou, Chern; [email protected]; Huang,
Frank; Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Le mercredi 21 janvier 2009 20:56:23 Dunn, Jeffrey H., vous avez
écrit :
Colleagues,
We have been performing some PMTUD tests and have found that
different
operating systems handle PMTUD differently. Specifically, we found
that the
"ping" application behaves in the following way when the PMTU is
set to
1280 and a 1500 octet ICMPv6 echo request is sent to that routed
path. The
hosts we tested:
I'm afraid ping applications are not representative of what the
operating
system IP stacks do. Besides, there are no standards regarding the
behavior
of "ping" in case of Path MTU problems; it's really up to the
implementor of
each "ping" whether to report an error or to transparently fragment.
The behavior of real transport protocols, such as TCP, DCCP and SCTP
is more
interesting when it comes to evaluating operating systems and their IP
stacks.
--
Rémi Denis-Courmont
http://www.remlab.net/
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