Avg. Packet Size - Again?

k claffy kc at caida.org
Thu Jul 24 00:42:24 CDT 2008


most recent update on this question, with
just a couple of data points:
http://www.caida.org/research/traffic-analysis/pkt_size_distribution/graphs.xml
(so, yes the peak has moved up to 1500.)

note there are more tiny packets in our recent ipv6 data, 
but that could just be someone's ping experiment, 
it's too small a sample (76k pkts) 

k


On Wed, Jul 16, 2008 at 08:24:59AM -0700, fred baker wrote:
  CAIDA has been doing a lot of that, at least in the past. Last I asked  
  them, which was quite a while back, they said that O(35%) of traffic  
  in their samples was at the path MTU (which included 576 bytes for  
  historical reasons), O(40%) was about the size of a TCP SYN or ACK,  
  for reasons that are apparent if you think about common TCP  
  implementations, and sizes were scattered more or less uniformly in  
  between - last packet in a burst or transaction exchanges. From the  
  numbers that Valdis posted the other day, it sounds like the logic  
  remains about the same but the relevance of "576" has largely gone away.
  
  On Jul 16, 2008, at 4:42 AM, Randy Bush wrote:
  
  >>Our network also shows peaks at the ethernet MTU (our MTU is higher
  >>than that) and the DNS packet size.
  >
  >so who has been tracking packet size distributions for some years and
  >has published or could provide data?
  >
  >randy
  >
  >
  >
  
  




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