On Wed, 1 Apr 2009, Eric Rescorla wrote:
On Wed, Apr 1, 2009 at 1:06 PM, Salman Abdul Baset <[email protected]> wrote:
For (2)
Clearly, Skype knows this. However, since we do not have this information,
the next best thing is to perform measurements. We performed experiments
where two Skype nodes were forced to select a relay for about ~18,000 calls
and we found 9,584 unique media relays. About 46% of calls were relayed
through nodes in educational institutions. These two statistics seem to
indicate that the likelihood of paid Skype nodes being heavily used as
relays is fairly low. Meaning, that Skype has no shortage of altruistic
media relays.
It's important to recognize one very significant difference between
RELOAD and Skype:
Skype controls the software you run and so can make you act as a
supernode--or at
least make it fairly difficult to opt out. By contrast, RELOAD will
presumably be open
software (at least the protocols will be open) so you cannot force
users to run relays.
-Ekr
Skype does make an active effort to avoid media relaying. These include
techniques like ICE-UDP and media-over-TCP for UDP-blocking firewalls.
So in terms of designing protocols for directly sending media, Skype and
RELOAD are no different.
Starting with v3.2, Skype provides a mechanism to turn off the super node
feature. See this:
http://www.skype.com/security/universities/
-s
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