Re: Happy St Nicholas Day: Re-Launching the IPv6 ULA registry
Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 08 December 2020 01:58 UTC
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Subject: Re: Happy St Nicholas Day: Re-Launching the IPv6 ULA registry
To: Fernando Gont <fgont@si6networks.com>, Nico Schottelius <nico.schottelius@ungleich.ch>, Lorenzo Colitti <lorenzo@google.com>
Cc: IPv6 List <ipv6@ietf.org>
References: <87r1o3deni.fsf@ungleich.ch> <CAKD1Yr3ptRjewThToEgERUOKwehTwdqNUAq14acc_nHLFqf3bg@mail.gmail.com> <87im9ds0z9.fsf@ungleich.ch> <6763ff23-f33d-1e45-a495-22c7ae3e741b@si6networks.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <2aa92872-8251-cd1a-8269-6b268ed378dc@gmail.com>
Date: Tue, 08 Dec 2020 14:58:46 +1300
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On 08-Dec-20 14:07, Fernando Gont wrote: > On 7/12/20 19:30, Nico Schottelius wrote: > [....] >> fd00::/48 is actually an example entry created during the Hackathon, >> which led us to implement the random generation instead as the primary >> option instead of focussing on submission of existing prefixes. >> >>> In fact, I just configured it on my network, so if >>> there was no duplicate before, there is one now. :-) >> >> With that argument even GUA is not GUA - I can also configure 2600::/32 >> or even 2001:db8::/32 in my network, it does not make me "own" 2600::/32 >> nor remove the documentation character from 2001:db8::/32. > > FWIW, for all practical purposes, ULAs are non-global-scope addresses -- > the only reason (?) they are considered global is that RFC4291 still > marks the ULA "space" as GUA, and RFC4193 hasn't updated that. It's also a bit of a historical accident, too. ULAs were invented at the same time that site-local was deprecated [1]. They are routeable (unlike link-locals) so RAs, PIOs and routing protocols treat them exactly like any other routeable address. So, given that site-local scope was abolished, they could only be called global-scope. They are only special in domain boundary routers, which should block them. Yes, this has led to confusion in the terminology, only partly resolved by https://tools.ietf.org/html/rfc8190#section-2.1 > So, an ULA is not meant to be globally usable, and only make sense > within an organization (whatever that means) -- and the same ULA prefix > being re-used is just fine. There were two arguments for making re-use highly unlikely. Merging two ULA networks, as I already mentioned, or VPNs interconnecting two ULA networks. We were told that both of those were real, active operational problems with RFC1918 addresses. > OTOH, GUAs are globally-meaningful -- and while you can indeed configure > any GUA prefix you want, you will not get the return traffic (which you > *would* if you really owned the prefix). Right. In that sense a ULA prefix really is a GUA subset - it should never be advertised in transit networks or the mythical DFZ. Regards Brian [1] https://tools.ietf.org/html/rfc3879
- Happy St Nicholas Day: Re-Launching the IPv6 ULA … Nico Schottelius
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Lorenzo Colitti
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Fernando Gont
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Brian E Carpenter
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nico Schottelius
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nico Schottelius
- RE: [EXTERNAL] Re: Happy St Nicholas Day: Re-Laun… Manfredi (US), Albert E
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Fernando Gont
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Fernando Gont
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Brian E Carpenter
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Fernando Gont
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nick Hilliard
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nico Schottelius
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Ted Hardie
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nico Schottelius
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Fernando Gont
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Philip Homburg
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Nick Hilliard
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Ted Hardie
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … David Farmer
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Mark Smith
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Brian E Carpenter
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Philip Homburg
- RE: [EXTERNAL] Re: Happy St Nicholas Day: Re-Laun… Manfredi (US), Albert E
- RE: [EXTERNAL] Re: Happy St Nicholas Day: Re-Laun… Templin (US), Fred L
- RE: [EXTERNAL] Re: Happy St Nicholas Day: Re-Laun… Manfredi (US), Albert E
- Re: [EXTERNAL] Re: Happy St Nicholas Day: Re-Laun… Brian E Carpenter
- Re: Happy St Nicholas Day: Re-Launching the IPv6 … Brian E Carpenter
- For whom is IPv6? [was: Happy St Nicholas Day: Re… Nico Schottelius
- Re: For whom is IPv6? Alexandre Petrescu
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Ted Lemon
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nick Hilliard
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Mark Andrews
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Fernando Gont
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Fernando Gont
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Fernando Gont
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nick Hilliard
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Fred Baker
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Philip Homburg
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Jens Link
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Philip Homburg
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nick Hilliard
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Mark Andrews
- Re: For whom is IPv6? [was: Happy St Nicholas Day… David Farmer
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Michael Richardson
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Brian E Carpenter
- Re: For whom is IPv6? [was: Happy St Nicholas Day… Nico Schottelius