Subject: [FECFRAME-PROTO] Fwd: The IPv4 Internet MTU

From: Marshall Eubanks <[email-masked]>
Date: Fri, 12 Oct 2007 10:54:48 -0400

The discussion on v6ops about path MTU and how hard it is to discover  
it has been interesting...

Begin forwarded message:

> From: Bob Hinden <[email-masked]>
> Date: October 11, 2007 8:01:20 PM EDT
> To: "Templin, Fred L" <[email-masked]>
> Cc: "Brian E Carpenter" <[email-masked]>, Rémi Denis- 
> Courmont <[email-masked]>, "Magnus Westerlund"  
> <[email-masked]>, "Christian Huitema"  
> <[email-masked]>, "Arnaud Ebalard"  
> <[email-masked]>, <[email-masked]>
> Subject: Re: The IPv4 Internet MTU
> Reply-To: [email-masked]
>
>>
>>> A sender could always cache the most recently discovered PMTU
>>> to a given destination. That would be enough for repeated
>>> short UDP flows to the same destination. As for isolated
>>> short UDP flows, they just need to use the Internet minimum
>>> MTU (576 or 1280) - there's no other possible solution.
>>
>> Minimum MTU for IPv4 is only 68 bytes; minimum EMTU_R
>> is the one that is 576 - right?
>>
>
> I forget the exact terminology, but Brian is talking about the  
> biggest packet one can send and be guaranteed it will not be  
> fragmented.  The is 576 bytes for IPv4 and 1280 bytes for IPv6.
>
> I think of it as the biggest smallest packet one can send :-)
>
> Bob
>
>
>

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