Comcast lengthens IPv6 lead

Takes dual approach to next-gen Internet by promoting transit and content

Comcast continues to outpace rival U.S. cable companies in the development of next-generation Internet connectivity and content.

Last week, the ISP was among the first carriers to demonstrate end-to-end IPv6 transmission for residential broadband customers. IPv6 is a long-anticipated upgrade to the Internet's main communications protocol that provides more IP addresses, built-in security and easier configuration than the existing IPv4 protocol.

Comcast's demonstration, which was held at the North American Network Operators' Group (NANOG) meeting, featured IPv6-enabled Web content from three leading providers: The Planet, a Web hosting company; Netflix, a movie distribution Web site; and Limelight Networks, a video streaming service.

"We showed the community what IPv6 might look like in a residential broadband scenario, coupled with content and services," said John Brzozowski, chief architect for the IPv6 program at Comcast. "What was significant was the whole collection of technologies involved and the collaborative effort it took to make it happen."

Comcast said it will be another year before the IPv6 service it demonstrated is commercially available.

"We're entering broadband trials later this year and will probably introduce IPv6 residential service in 2010," said Jorge Alberni, director of corporate communications for Comcast. "I don't know exactly when general deployment will happen."

Also last week, Comcast announced that it would offer IPv6 transit services to its wholesale customers. Comcast has around 100 wholesale business customers, which are primarily Web hosting companies and Web content providers. Two of Comcast's wholesale customers - The Planet and BitGravity -- said they were purchasing the new IPv6 transit service.

Brzozowski says Comcast's wholesale customers are worried about IPv4 address depletion, which is expected to occur by 2012. Additionally, these Web content providers are concerned that if they don't embrace IPv6 now, they'll be forced to send their content over a complex architecture of carrier-grade network address translation devices once IPv4 addresses run out.

The Planet and BitGravity "understand the advantages of IPv6 and that carrier-grade NATs are going to dramatically affect their businesses," Brzozowski said. "They would rather see network operators focus our energies on IPv6 as opposed to working around the issues related to carrier-grade NATs."

Brzozowski says deploying IPv6 across Comcast's network in preparation for the demonstration wasn't hard.

"It wasn't that difficult," he said. "The cable industry has been making the piece-parts available for over three years now. So now this demonstration was about us taking the piece-parts that we needed to support IPv6 and standing them up for a live demo at NANOG...We received a lot of "Wows" from the audience."

IPv6 leaders hailed Comcast's progress.

"It's a positive step forward anytime a service provider deploys IPv6 in their network, but it is especially significant to have a company the size of Comcast, with their extensive broadband Internet customer base, make this commitment," says Cody Christman, Director of Product Engineering at NTT America, which has been offering IPv6 transit services in the United States since 2001.

"Comcast's move is a necessary step in providing home broadband Internet customers in the U.S. access to the IPv6 Internet," Christman added. "Hopefully, other broadband service providers will follow suit."

Comcast is taking a unique approach to promoting IPv6 in the United States, by developing IPv6-based services for its customers and encouraging Web sites to offer IPv6-enabled content.

Comcast's strategy is "to leverage IPv6 for the huge number of end-points on our network that are subscriber facing," Brzozowski says. "We have a vested interest in making sure that we not only plan to enable IPv6 connectivity but that we are working with the community to enable IPv6 content and services."

Until now, IPv6-enabled content has been rare. One of the only high-profile U.S. Web sites to support IPv6 is Google.

"The majority of Web sites still do not support IPv6," says Dave Siegel, vice president of IP services product management at Global Crossing, which was one of the first service providers to deploy native IPv6 on its infrastructure. But Siegel added that Comcast's move "should increase awareness of the need to help build momentum for IPv6 overall."

Brzozowski says it's unreasonable to expect consumers or companies to migrate to IPv6 unless IPv6-enabled content is available.

IPv6-enabled content is "scarce but growing," Brzozowski said. "We made sure that Netflix and Limelight had sufficient opportunity at NANOG to talk about their efforts to enable IPv6...They did it in about two months time."

Following the Comcast IPv6 demonstration, Limelight Networks said it is one of the first content delivery networks to offer commercial IPv6 services.

Similarly, Netflix is now offering its members the ability to manage their rental queues and stream media by visiting

The Planet, which hosts more than 15 million Web sites, has been offering IPv6 functionality for more than a year.

Comcast wouldn't comment on when its own Web content --including sites operated by E!Entertainment Television, Style Network and the Philadelphia Flyers hockey team--would be IPv6-enabled.

"We're working on this internally, but I can't elaborate on when," Brzozowski said. "Rest assured that better than anybody else, we understand that content and connectivity go hand-in-hand."

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Carolyn Duffy Marsan

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