George Michaelson

IETF 98 Chicago: New Energy in the IPv6 Operations WG

George Michaelson
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The IPv6 Operations Working Group (v6ops) met here in Chicago. It was a packed room with lots of great energy and many constructive conversations about work in progress.



The microphone queue at V6OPS for the ‘Happy Eyeballs revised’ discussion. Source: Merike Kaeo

Fred Baker, who is now a Cisco emeritus, continued to chair the group and is considering a minor revision of the charter of the v6ops wg to include a more explicit need to recognise an emerging future: IPv6-only networks. Apart from this news, two other significant topics came up, which I’d like to share.

The first was the continuing discussion of “how to find a DNS server”.

A lot of people pragmatically want to go with structured network management options which they use right now; prescriptive lists of prefixes bound to known hosts, and the IPv6 version of this doesn’t provide for DNS server configuration. However, RDNSS, the mechanism which is designed to do this, can be implemented inside the RA function of SLAAC in less than 10 lines of C code, and according to one expert in the room that includes error handling.

This really needs to be nailed down, especially if we’re going to address Fred’s concerns of an IPv6-only future network. The common fallback position most dual stack networks have right now, pragmatically, is to use the DNS configuration coming from IPv4 DHCP.

The second topic was a practical review of Apple’s Happy Eyeballs work.

The Apple engineers doing the work are both keen participants in the IETF and have been doing a huge Internet-wide experimental review of how Apple product copes with a dual stack network, chooses the best (and hopefully, when appropriate, the IPv6) path to use.

They’ve got some simple modifications they want to see implemented to do this, and there was a long microphone line of comments and feedback, even some pointed suggestions to start increasing the delay added to the kick-off of the IPv4 connection – one speaker suggested an additional 15ms of delay per year!

Some of this work recognises what’s been in sunset4, but also of the emerging reality that we already have a worldwide IPv6 network. And with CDN support of IPv6 it’s entirely plausible for people to configure for a future v6-only world right now.


This was originally published on the APNIC blog.

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About the author

George Michaelson is currently APNIC's senior R&D scientist. Recently, he has been working on long-baseline IPv6 and DNS statistics using Internet-wide end-user measurement, services logging, audit and analysis, and design and implementation of the Internet Number Resource Certification framework. George is a member of the BCS, and a founder member of the Australian chapter of the Internet Society. He participates regularly in IETF standardisation meetings, and co-authors Request For Comment (RFC) documents, technical drafts, and conference and peer-review papers. George graduated from York University in 1982 with a BSc in Computer Science. His career in the United Kingdom and Australia has pursued research and development in computer science, networking, and systems administration.

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