Re: End System PMTUD behavior question

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:rdenis@simphalempin.com]
> Sent: Wednesday, January 21, 2009 2:33 PM
> To: ipv6@ietf.org
> Cc: Dunn, Jeffrey H.; ipv6-bounces@ietf.org; v6ops@ops.ietf.org;  
> Sherman, Kurt T.; Liou, Chern; steve_eiserman@uscourts.gov; 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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