nanog mailing list archives
Re: How Skype uses the network [was: News item: Blackberry services down worldwide]
From: Alex Brooks <askoorb+nanog () gmail com>
Date: Sat, 15 Oct 2011 14:17:54 +0100
Howdy, On Fri, Oct 14, 2011 at 8:11 PM, Patrick W. Gilmore <patrick () ianai net> wrote:
On Oct 13, 2011, at 7:26 PM, Matthew Kaufman wrote:On 10/13/11 3:30 PM, Patrick W. Gilmore wrote:In fact, Skype, just as a for instance, is worse on hotel wifi as launching the app on a laptop makes you a middle node for some conversations.Per the Skype IT administrator guide, a Skype node will not become a supernode unless it has a public IP address and meets the memory, bandwidth, and uptime requirements. It will not become a relay node unless it has a public IP address and is directly reachable from the Internet. It is very unlikely that launching the Skype app on a laptop on hotel wi-fi would meet these requirements.In the last 5 seconds, without touching Skype or having any active voice or chat sessions open, my computer has had communication with 14 IP addresses. Here is a sample of some:
For "IT administrators" (which probably qualifies most people on this list) there is a detailed 26 page guide to how Skype communicates on a network, when you may become a supernode, and how to configure the program (including to never become a supernode) using GPO (registry switches) or XML files at http://download.skype.com/share/business/guides/skype-it-administrators-guide.pdf. There is a summary of the Supernodes section (concentrating on how to stop supernodes happening if you have no control of the client) at http://www.skype.com/intl/en-us/security/universities/. Anybody who might end up with Skyoe clients on their network might want to give it a gander, as it has some useful info on things like network impact (along with a lot of stuff that nobody cares about and you can skip). HTH, Alex
Current thread:
- Re: [outages] News item: Blackberry services down worldwide, (continued)
- Re: [outages] News item: Blackberry services down worldwide Jay Ashworth (Oct 13)
- Re: [outages] News item: Blackberry services down worldwide Christopher Morrow (Oct 13)
- RE: [outages] News item: Blackberry services down worldwide Jamie Bowden (Oct 13)
- Re: NANOG:RE: [outages] News item: Blackberry services down worldwide Andrea Gozzi (Oct 13)
- Re: NANOG:RE: [outages] News item: Blackberry services down worldwide McCall, Gabriel (Oct 13)
- Re: [outages] News item: Blackberry services down worldwide Patrick W. Gilmore (Oct 13)
- Re: [outages] News item: Blackberry services down worldwide Matthew Kaufman (Oct 13)
- How Skype uses the network [was: News item: Blackberry services down worldwide] Patrick W. Gilmore (Oct 14)
- Re: How Skype uses the network [was: News item: Blackberry services down worldwide] Cameron Byrne (Oct 14)
- Re: How Skype uses the network [was: News item: Blackberry services down worldwide] Matthew Kaufman (Oct 14)
- Re: How Skype uses the network [was: News item: Blackberry services down worldwide] Alex Brooks (Oct 15)
- Re: NANOG:RE: [outages] News item: Blackberry services down worldwide Scott Howard (Oct 13)
- RE: NANOG:RE: [outages] News item: Blackberry services down worldwide Vinny_Abello (Oct 13)
- Re: [outages] News item: Blackberry services down worldwide Jared Mauch (Oct 13)
- Re: [outages] News item: Blackberry services down worldwide Nikolay Shopik (Oct 14)
- RE: [outages] News item: Blackberry services down worldwide Leigh Porter (Oct 14)
- Re: [outages] News item: Blackberry services down worldwide Martin Millnert (Oct 14)
- Re: [outages] News item: Blackberry services down worldwide Carlos Alcantar (Oct 14)