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Re: IP Packet size

2000-12-10 07:30:02
"fb" == Fred Baker <fred(_at_)cisco(_dot_)com> writes:
[an excellent characterization of the packet size distribution you
 will typically see on the Internet]

The average of the above is generally in the 200-250 bytes per packet
neighborhood, largely due to the predominance of 552 byte segments. If
Path MTU were more widely used - something one would expect to happen
as systems are upgraded over time - this likely would grow to upper
hundreds.

PMTUD is quite widely used these days.  Whenever I look at the traffic
size distributions on our transatlantic links (on which traffic is
dominated by TCP in exactly the way you described), I see around 30%
packets in the "1024-1536" bin, anyway always *much* more than in the
512-576 bins.  The average packet size I see right now is near 500
bytes.

Your other predictions are backed up by my data---40-50% of tinygrams,
and a fairly even distribution of the other sizes, with some bias
towards smaller packets.
-- 
Simon.

swiEG1>sh ip ca fl
IP packet size distribution (41188M total packets):
   1-32   64   96  128  160  192  224  256  288  320  352  384  416  448  480
   .001 .473 .035 .013 .011 .007 .006 .005 .004 .004 .004 .008 .004 .003 .004

    512  544  576 1024 1536 2048 2560 3072 3584 4096 4608
   .003 .003 .061 .052 .289 .000 .000 .000 .000 .000 .000



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