IPv6 faces trial by fire tonight

Internet Engineering Task Force chair discusses the future of IPv6

The Internet engineering community will be eating its own dog food tonight. For one hour, the 1,250 network experts at the Internet Engineering Task Force meeting will be able to access the Internet only through IPv6. The IETF created IPv6 in the mid-1990s, but this upgrade to the Internet's main communications protocol has not yet been widely deployed -- even by the technology's biggest proponents here. Network World National Correspondent Carolyn Duffy Marsan talked with IETF Chair Russ Housley about the group's IPv6 experiment, why the transition to IPv6 is taking so long, and whether the IETF leadership is starting to panic about IPv4 addresses running out. Here are excerpts from their conversation:

You're turning off the IPv4 network during the plenary session tonight and requiring everyone here to use IPv6. Is this significant or is this a publicity stunt?

I didn't do it as a publicity stunt. It's become more of one than I intended. It's our strong preference to preserve the end-to-end model of the Internet and deploy IPv6 and not [network address translation.] We need to have network people use the IPv6 implementations, find out where they're fragile and fix them so IPv6 deployment will be smooth. This experiment also is about finding out how hard it is to deploy IPv6. A lot of IETF people want to have their Web sites accessible during the IPv6 experiment, and they are taking the necessary steps to make their Web sites available on IPv4 and IPv6. IPv6 has been available on our network for the whole meeting, but we're turning off the IPv4 part of our network for one hour. The point of this is to get people to move out of their comfort zones with IPv4 and start using IPv6.

The IETF created IPv6 13 years ago, and it's only in a handful of production networks. Why is it taking so long?

Economics. If you are able to get your application to work on IPv4, there's no economic reason to invest in IPv6. You're just creating a second way for the same job to get done. The thing that's changing is that we're going to run out of IPv4 addresses and so we have a choice facing us. One is to have NAT upon NAT so that the Internet continues to work, or we can preserve the end-to-end model by moving away from IPv4 to IPv6. I'm hoping that IPv6 will be the answer because we want it to be easy to add new applications to the Internet. The more things that are in the middle such as NATs, the harder it will be for new applications to deploy.

It didn't take this long for the Internet to adopt MPLS or Session Initiation Protocol. What did the IETF do wrong when it designed IPv6?

Nothing. At the time MPLS and SIP were developed, there were already economic reasons to deploy them. IPv6 was developed because we knew the IPv4 address shortage was coming. But the economics for deploying IPv6 doesn't happen until the IPv4 address space becomes very scarce. All the technical pieces were there, but it's the economics that are driving when it is actually used by service providers. The IETF doesn't have economic levers.

I'll ask you the opposite question: What's good about how the IETF designed IPv6?

We saw IPv4 address depletion was coming, and we filled the need perhaps too soon. There was this idealistic view that if both IPv4 and IPv6 existed, both would be deployed. Then when IPv4 addresses ran out, there would be this smooth and easy transition to IPv6. But the economic incentives weren't there to deploy IPv6. We won't know if we designed IPv6 correctly until it's deployed and used heavily. That's what our experiment is about tonight.

The United States appears to be in a recession. Will this slow IPv6 adoption?

I doubt it because IPv4 address allocation requests have not slowed. That says that people are still deploying Internet applications. We can argue over what month IPv4 addresses are going to run out, but the prediction is that in 2010 the Internet Assigned Numbering Authority will issue the last block of IPv4 free address space. This prediction is based on the assumption that the IPv4 address space requests will continue to come in at the rate they have. A gold rush mentality will make the addresses run out quicker. That hasn't happened yet. People are still playing fair.

Join the PC World newsletter!

Error: Please check your email address.

Our Back to Business guide highlights the best products for you to boost your productivity at home, on the road, at the office, or in the classroom.

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Carolyn Duffy Marsan

Network World
Show Comments

Most Popular Reviews

Latest News Articles


PCW Evaluation Team

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Aysha Strobbe

Windows 10 / HP Spectre x360

Ultimately, I think the Windows 10 environment is excellent for me as it caters for so many different uses. The inclusion of the Xbox app is also great for when you need some downtime too!

Mark Escubio

Windows 10 / Lenovo Yoga 910

For me, the Xbox Play Anywhere is a great new feature as it allows you to play your current Xbox games with higher resolutions and better graphics without forking out extra cash for another copy. Although available titles are still scarce, but I’m sure it will grow in time.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?