Last week, the Philadelphia 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.’’