Subject: SIP in higher education
Skype Supernodes - How Much Traffic Do they Really Generate?
- From: Ben Teitelbaum <>
- To: "SIP.edu" <>, VoIP Working Group <>
- Subject: Skype Supernodes - How Much Traffic Do they Really Generate?
- Date: Wed, 26 Jul 2006 13:34:13 -0400
I'm unclear on how much traffic a typical Skype supernode actually
generates. The numbers I've been able to find are all over the map.
For example,  finds the median bandwidth utilization per supernode
to be only 205 bps (not Kbps), while  claims:
"Over the period of 20 days, we observed a total of 341
Skype-relayed bursts of packets, corresponding to a total of
1.11Gbytes of data.'
which is an average of about 5 Kbps (or 25x what  found). A study
from JANET  includes a plot that shows sustained traffic in excess
of 30 Kbps (6x what  found and 150x what  found!).
Does anyone have any measurements or rules-of-thumb for average or
peak loads generated by a Skype supernode?
1. An Experimental Study of the Skype Peer-to-Peer VoIP System,
S. Guha, N. Daswani, R. Jain, IPTPS 2006.
2. "Characterizing and detecting relayed traffic: A case study using
Skype", Kyoungwon Suh, Daniel R. Figueiredo, Jim Kurose, Don
3. "Skype and JANET",
Ben Teitelbaum http://people.internet2.edu/~ben/
- Skype Supernodes - How Much Traffic Do they Really Generate?, Ben Teitelbaum, 07/26/2006
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