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RE: The IPv4 Internet MTU
On Thu, 27 Sep 2007 16:36:09 -0700, Christian Huitema
>> Why not just set the Teredo interface MTU to (64KB-ENCAPS)?
>> Then, take special care to make sure the small packets get
>> through but let the big packets take care of themselves.
> The problem is UDP fragmentation. By nature, it is unreliable: the more
> fragments, the more chances to lose one of them, thus causing the loss of
> the entire packet. This is aggravated by NAT behavior: some NAT will try
> reassemble the packets, but others will just pass the 1st fragment and
> the next ones.
Maybe Fred was hinting that Teredo could have defined its
fragmentation layer between UDP and IPv6. But while this would
work-around on-path fragmentation it would bring a naughty congestion
control issue - one simply cannot send 40 datagrams of 1500 bytes each
with no pacing. And we don't want to have to do congestion control,