North American Network Operators Group

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Re: MTU of the Internet?

  • From: Per Gregers Bilse
  • Date: Thu Feb 05 11:03:58 1998

FWIW, our router at MAE-East says:

IP packet size distribution (38569M total packets):
   1-32   64   96  128  160  192  224  256  288  320  352  384  416  448  480
   .000 .400 .046 .016 .018 .012 .008 .009 .011 .012 .006 .007 .005 .004 .004

    512  544  576 1024 1536 2048 2560 3072 3584 4096 4608
   .010 .006 .120 .000 .099 .197 .000 .000 .000 .000 .000

It's been up for some weeks and the sample size is, well, OK.  As
expected, large number at the low end, but I'm not sure what to think
about the 2048 slot.  I would have thought that once packets are bigger
than ethernet MTU, they would also be bigger than 2048.  If the
numbers are true, then close to 1/3 of all packets (1536 slot plus 2048
slot) are larger than 576.

-- 
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