[IPv6]Re: Analysis of Ungleich ULA Registry
David Farmer <farmer@umn.edu> Tue, 28 May 2024 19:11 UTC
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From: David Farmer <farmer@umn.edu>
Date: Tue, 28 May 2024 14:11:05 -0500
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To: "Dale W. Carder" <dwcarder@es.net>
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Subject: [IPv6]Re: Analysis of Ungleich ULA Registry
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On Tue, May 28, 2024 at 1:49 PM Dale W. Carder <dwcarder@es.net> wrote: > Thus spake David Farmer (farmer=40umn.edu@dmarc.ietf.org) on Mon, May 27, > 2024 at 11:18:08AM -0500: > > While the Ungleich ULA Registry demonstrates significant support for full > > registration, something like draft-hain-ipv6-ulac provides. My > > primary concern is a mechanism that allows for ULA prefixes shorter than > > /48 as a result of the practical restrictions of 10 ULA prefixes created > by > > known-local ULA. I could accept a consensus to accomplish that through > > randomized local ULA assignments of ULA prefixes shorter than /48 instead > > of centralized ULA assignments. However, unfortunately, it is unclear to > me > > that there is a consensus for either way forward. > > I feel like I missed something, can you help explain where this number > 10 is coming from? > > Dale > RFC 4191, section 4 states, "Routers SHOULD NOT send more than 17 Route Information Options in Router Advertisements per link." However, you want some of the RIOs for GUA, and you probably want room for other options in your RA as well. So, a practical limitation of known-local ULA of around 10 RIOs for ULA exists. You might squeeze a few more in but won't make it to 20. And if you have multiple routers on a link, you could put some RIO on one router and different RIOs on the other router, but an outage will cause some RIOs to go away. Hope that helps. -- =============================================== David Farmer Email:farmer@umn.edu Networking & Telecommunication Services Office of Information Technology University of Minnesota 2218 University Ave SE Phone: 612-626-0815 Minneapolis, MN 55414-3029 Cell: 612-812-9952 ===============================================
- [IPv6]Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry Kyle Rose
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry Kyle Rose
- [IPv6]Re: Analysis of Ungleich ULA Registry Brian E Carpenter
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry Lorenzo Colitti
- [IPv6]Re: Analysis of Ungleich ULA Registry Mark Smith
- [IPv6]Re: Analysis of Ungleich ULA Registry Brian E Carpenter
- [IPv6]Re: Analysis of Ungleich ULA Registry Kyle Rose
- [IPv6]Re: Analysis of Ungleich ULA Registry Kyle Rose
- [IPv6]Re: Analysis of Ungleich ULA Registry Ole Trøan
- [IPv6]Re: Analysis of Ungleich ULA Registry Bob Hinden
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry Nico Schottelius
- [IPv6]Re: Analysis of Ungleich ULA Registry Ole Troan
- [IPv6]Re: Analysis of Ungleich ULA Registry Kyle Rose
- [IPv6]Re: Analysis of Ungleich ULA Registry Mark Smith
- [IPv6]Re: Analysis of Ungleich ULA Registry Nico Schottelius
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer
- [IPv6]Re: Analysis of Ungleich ULA Registry Dale W. Carder
- [IPv6]Re: Analysis of Ungleich ULA Registry David Farmer