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This list includes links to different resources of interest for all things videoconference-wise.
Updated on 2009-04-10
Created on 2009-04-09
Category: Computers & Internet
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[Skype] If I use a router will skype still act as supernode? - dslreports.com
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If you want to make absolutely sure not to become a supernode, just run skype behind a symmetric NAT router.
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I run skype in parallel with SIP on my network, behind a symmetric router, and it has never caused any noticeable degradation for me in any networked application that I use, nor with my SIP/RTP communications on either end. YMMV however.
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ISO Consensus Paper: Skype
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Many network and systems administrators take a dim view of Skype because experience with the software has shown that it can be a bandwidth hog. Other administrators fear that Skype's inherent ability to traverse firewalls is a security risk. And some administrators feel the combination of Skype's encryption and its binary-only, closed-source nature make it a black box, or complete unknown that has no place being on a well-maintained network. While these are all valid concerns, they should be considered in the context of local network policies and weighed against the benefits that Skype can provide. In many cases, running Skype in a well-managed environment can mitigate these risks.
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The purpose of this paper is to suggest best practices and recommendations when running Skype.
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An Experimental Study of the Skype Peer-to-Peer VoIP System
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Supernodes typically use little
bandwidth even though they relay VoIP and file-transfer traffic in certain
cases.
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Skype - how not to be a supernode « Visible Procrastinations
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- Any computer hosted on a network that is behind a network address translation (NAT) device or restrictive firewall will disable supernode functionality.
- Skype clients behind an HTTP or SOCKS5 proxy will not serve as supernodes.
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Find out if your computer acts as a Skype Super-Node
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Add Sticky NoteThe best way in my opinion to find out if Skype is acting as a Super-Node is to start it and let it run for a few hours without using it actively. Bandwidth consumption is obviously higher if you make calls or transfer data with Skype and it is more difficulty to find out if Skype is acting as a Super-Node if you have to analyze the traffic in direct and indirect traffic.
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The easiest way to prevent Skype from being a Super-Node is to block access to the ports 80 and 443 in Skype. You can do that under Tools > Options > Connections. Just uncheck the option “Use port 80 and 443 as alternatives for incoming connections”.
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Skype security resource center
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- Beginning with Skype 3.0, an explicit switch is provided in the registry settings to allow the disabling of supernode functionality.
- Any computer hosted on a network that is behind a network address translation (NAT) device or restrictive firewall will disable supernode functionality.
- Skype clients behind an HTTP or SOCKS5 proxy will not serve as supernodes.
There are several ways to prevent Skype from becoming a supernode:
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While the use of a SOCKS5 proxy still requires manual intervention by the user, the use of a proxy allows the economical "shaping" of Skype traffic. It has the additional positive side-effect of reducing supernodes on the network, reducing false-positive intrusion prevention system alarms and allowing for accurate measurement of Skype usage on the proxied network.
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