North American Network Operators Group
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Re: Most up to date packet size distribution info

  • From: Robert Boyle
  • Date: Wed Dec 17 21:41:14 2003 
At 04:08 PM 12/17/2003, Jared wrote:

        Close to what we see at one location:

Router#sh ip ca flow
IP packet size distribution (17137M total packets):
   1-32   64   96  128  160  192  224  256  288  320  352  384  416  448  480
   .004 .621 .068 .029 .013 .007 .005 .006 .003 .005 .006 .006 .006 .004 .004

    512  544  576 1024 1536 2048 2560 3072 3584 4096 4608
   .004 .003 .016 .018 .159 .000 .000 .000 .000 .000 .000
Here is what we see:

core1-jcnj>sh ip ca fl
IP packet size distribution (20372M total packets):
1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480
.001 .411 .251 .018 .015 .006 .027 .004 .003 .003 .003 .004 .003 .002 .003

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608
.003 .002 .139 .012 .082 .000 .000 .000 .000 .000 .000

and

core1-nwtnj>sh ip ca fl
IP packet size distribution (22181M total packets):
1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480
.001 .429 .158 .023 .021 .010 .011 .006 .005 .004 .004 .006 .004 .003 .003

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608
.003 .002 .054 .025 .219 .000 .000 .000 .000 .000 .000


I see an interesting variation in 1536 byte packets on our network anyway. core1-nwtnj is primarily a colo router and core1-jcnj is a backbone router connected to edge routers with lots of dialup, dsl, t1 and t3 customers. Of course traffic can pass through both routers en route, but it appears that most 1536 byte traffic does not.

-Robert


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