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popper · 23-06-2007, 18:35

http://www.pcadvisor.co.uk/news/index.cfm?newsid=9839
"
MySpace threatening net bandwidth

YouTube & Facebook also hurting businesses

...
The social-networking sites "are generating much more DNS queries per user than other sites," said Keith Oborn, network systems product architect with Virgin Media.

"Because of the way MySpace pages are structured, a single page can generate hundreds of DNS queries."

Oborn said the fact that many of these social-networking sites, including MySpace and YouTube, are served by content-delivery networks adds to the DNS traffic.

"They're making use of an awful lot of short TTLs [time to live values]," Oborn said. "That increases the load on the DNS servers.

The same thing would happen for an enterprise customer as you see happening on a service provider network."

Oborn said it's rare for one website to account for 10 percent of DNS traffic.

"MySpace is the one that everybody knows about," he said. "It's the thing we need to keep a careful eye on in DNS land."

Virgin Media is addressing this phenomenon by upgrading its DNS infrastructure to the latest version of Nominum's software, which uses a technique called Anycast to provide load balancing for improved redundancy.

Virgin Media will complete the upgrade this summer.
With the new configuration, Virgin Media said it "could do 2.5 million DNS queries per second, but all we need is 50,000 or 60,000”, Obort said.

"We have a lot of overcapacity in DNS, which is both cheap and good to have. ... It cost us a few hundred thousand pounds at most."
Virgin Media is anticipating continued growth in its DNS traffic, driven in part by social-networking sites.

"Overall our DNS traffic is growing twice as fast as the number of users," Oborn said. ..."

23-06-2007, 18:35	#20
popper Inactive Join Date: Jan 2006 Posts: 3,270	Re: It's In The News: a central thread http://www.pcadvisor.co.uk/news/index.cfm?newsid=9839 " MySpace threatening net bandwidth YouTube & Facebook also hurting businesses ... The social-networking sites "are generating much more DNS queries per user than other sites," said Keith Oborn, network systems product architect with Virgin Media. "Because of the way MySpace pages are structured, a single page can generate hundreds of DNS queries." Oborn said the fact that many of these social-networking sites, including MySpace and YouTube, are served by content-delivery networks adds to the DNS traffic. "They're making use of an awful lot of short TTLs [time to live values]," Oborn said. "That increases the load on the DNS servers. The same thing would happen for an enterprise customer as you see happening on a service provider network." Oborn said it's rare for one website to account for 10 percent of DNS traffic. "MySpace is the one that everybody knows about," he said. "It's the thing we need to keep a careful eye on in DNS land." Virgin Media is addressing this phenomenon by upgrading its DNS infrastructure to the latest version of Nominum's software, which uses a technique called Anycast to provide load balancing for improved redundancy. Virgin Media will complete the upgrade this summer. With the new configuration, Virgin Media said it "could do 2.5 million DNS queries per second, but all we need is 50,000 or 60,000”, Obort said. "We have a lot of overcapacity in DNS, which is both cheap and good to have. ... It cost us a few hundred thousand pounds at most." Virgin Media is anticipating continued growth in its DNS traffic, driven in part by social-networking sites. "Overall our DNS traffic is growing twice as fast as the number of users," Oborn said. ..."