Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
Mark Smith <markzzzsmith@gmail.com> Mon, 04 February 2019 00:52 UTC
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References: <60fabe4b-fd76-4b35-08d3-09adce43dd71@si6networks.com> <alpine.DEB.2.20.1901311236320.5601@uplift.swm.pp.se> <m1gpCcz-0000FlC@stereo.hq.phicoh.net> <ddd28787-8905-bafd-3546-2ceef436c8b0@si6networks.com> <m1gptWx-0000G3C@stereo.hq.phicoh.net> <69609C58-7205-4519-B17A-4FBC8AE2EA16@employees.org> <ac773bb5-0da8-064b-d46b-3a218b8c9e7a@si6networks.com> <CFAEACC4-BA78-4DF9-AD8A-3EB0790B8000@employees.org> <a4f6742e-f18e-3384-d4cc-06bfab49101f@si6networks.com> <FEFA99C2-4F09-4D8F-8D51-C9D9D7090637@employees.org> <a484d5de-0dce-a41a-928e-785d8d80d05d@si6networks.com> <CAO42Z2xzYQESqqsz4AEE89vx=AhvBEf8Yzyae9o7z1U1XYyarw@mail.gmail.com> <af53b388-2985-9e45-a41c-18fc588f88b8@si6networks.com>
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From: Mark Smith <markzzzsmith@gmail.com>
Date: Mon, 04 Feb 2019 11:51:42 +1100
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To: Fernando Gont <fgont@si6networks.com>
Cc: Ole Troan <otroan@employees.org>, v6ops list <v6ops@ietf.org>, 6man WG <ipv6@ietf.org>
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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On Mon, 4 Feb 2019 at 04:40, Fernando Gont <fgont@si6networks.com> wrote: > > On 3/2/19 13:49, Mark Smith wrote: > [....] > >>> So a bug. > >>> What you are talking about is the case where the ISP breaks the contract. While it previously promised to delegate you a prefix until 20200301, all trace of that has gone. > >> > >> The CPE is the middle-man between the ISP and the LAN. No matter what > >> you may *expect* the CPE to do, the CPE is currently not actually > >> required to e.g. clean after the contract that the ISP broke (if you > >> assume/think there's such a thing), or even adjust prefix timers > >> according to the DHCPv6 lease times -- talk about under-specification of > >> the glue between e.g. DHCPv6-PD and SLAAC. > >> > >> Besides, the layer-8 contract between the user and the ISP may be that > >> you get dynamic prefixes. This means that whenever you request a lease, > >> you get a different prefix. You might say that if you don't do another > >> DHCPv6-PD request, you should be able to use the same prefix. But if you > >> do ask a new prefix, you might indeed get a new one -- and this is what > >> normally happens after reboots. > > > > That's against the architecture and design of the Internet protocols. > > > > A router reboot, anywhere along the path between communicating > > end-points, is supposed to have no more effect than a transient period > > of packet loss. Recovery is supposed to be via transport layer > > retransmission within the existing established connections. > > If you change the addresses, all bets are off. Getting a different > prefix might mean, in theory, that you¡re attached to a different point > of the network topology. > > In any case, the debate here is how to improve things when such > scenarios do happen. > > So I think it is worth finding out exactly why ISPs are doing this, to then work out what the best solution or solutions are. Are they doing it 1. because they're used to giving residential IPv4 customers dynamic addresses by default, so they've carried that practice over to IPv6 without realising there are different and avoidable consequences? 2. their employer charges a premium for static address assignment in IPv4, and their employer assumes or expects, possibly implicitly, to do the same with IPv6? 3. because PD privacy e.g. German example? 4. to suit occasional flash renumbering? 5. ??? In some of these cases, education may be a better, easier and quicker solution in comparison to the years it'd take to deploy CPE behaviour changes. I put options in radvd that tried to mitigate this nearly 10 years ago (DeprecatePrefix, DecrementLifetimes), as radvd was popular in IPv6 CPE I was working with at the time. Assuming radvd is still popularly used, if those options haven't been widely enabled and are not well known, then that might indicate an education and expectations problem. Ultimately though, the residential ISP I worked for decided to give up the specialness and price premium of static addresses and gives all customers their own persistent stable PD prefix tied to PPPoE username. I've had the same one at home for 7 years. > > >> The CPE should -- if possible -- be faithful to its LAN hosts, and > >> advertise if previous contracts between the CPE and the LAN hosts are > >> void. i.e., if the CPE does not get leased the same prefix as before, > >> it shoudl notifiy its "clients". However, possibly for simplicity sake, > >> CPEs don't record what > >> information was previously advertised on the LAN -- they are not > >> required, so.... when they reboot, they may not not be in a position to > >> notify hosts accordingly. > >> > >> That's the environment hosts operate in -- no matter whether you or me > >> like it. > >> > >> In that environment, hosts can and should be smarter. > > > > > > Multipath transport layer protocols for the win. They're splitting > > identifier semantics off from IP addresses. > > That's mostly irrelevant -- because the thing here is to get rid of the > invalid addresses which tends to be benefical for anything running on IP. > > I don't think it is. Invalid addresses become far less of an issue when a transport layer connection doesn't depend on a single address at each end and that it is valid all of the time. Regards, Mark.
- [v6ops] A common problem with SLAAC in "renumberi… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Tassos Chatzithomaoglou
- Re: [v6ops] A common problem with SLAAC in "renum… Bernie Volz (volz)
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Sander Steffann
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Sander Steffann
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Philip Homburg
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Tarko Tikan
- Re: [v6ops] A common problem with SLAAC in "renum… Philip Homburg
- Re: [v6ops] A common problem with SLAAC in "renum… Tarko Tikan
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Sander Steffann
- Re: [v6ops] A common problem with SLAAC in "renum… Sander Steffann
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Philip Homburg
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Fred Baker
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Joel M. Halpern
- Re: [v6ops] A common problem with SLAAC in "renum… Nick Hilliard
- Re: [v6ops] A common problem with SLAAC in "renum… Michael Richardson
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Christian Huitema
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Michael Richardson
- Re: [v6ops] A common problem with SLAAC in "renum… Michael Richardson
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Christian Huitema
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Andrews
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Christian Huitema
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Tore Anderson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Jen Linkova
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Jen Linkova
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Joel M. Halpern
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Jen Linkova
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Nick Hilliard
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… sthaug
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… j h woodyatt
- Re: [v6ops] A common problem with SLAAC in "renum… Manfredi (US), Albert E
- Re: [v6ops] A common problem with SLAAC in "renum… Nick Hilliard
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… Manfredi (US), Albert E
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… Manfredi (US), Albert E
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Erik Kline
- Re: [v6ops] A common problem with SLAAC in "renum… Erik Kline
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Erik Kline
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… j h woodyatt
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Erik Kline
- Re: [v6ops] A common problem with SLAAC in "renum… j h woodyatt
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… Tim Chown
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Timothy Winters
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… Manfredi (US), Albert E
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… Brian E Carpenter
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Gert Doering
- Re: [v6ops] A common problem with SLAAC in "renum… Manfredi (US), Albert E
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Tom Herbert
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Andrews
- Re: [v6ops] A common problem with SLAAC in "renum… Owen DeLong
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… Tom Herbert
- Re: [v6ops] A common problem with SLAAC in "renum… Owen DeLong
- Re: [v6ops] A common problem with SLAAC in "renum… Tom Herbert
- Re: [v6ops] A common problem with SLAAC in "renum… JORDI PALET MARTINEZ
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- [v6ops] NAT debate (Re: A common problem with SLA… Fernando Gont
- Re: [v6ops] NAT debate (Re: A common problem with… Tom Herbert
- Re: [v6ops] NAT debate (Re: A common problem with… Kristian McColm
- Re: [v6ops] NAT debate (Re: A common problem with… Tom Herbert
- Re: [v6ops] NAT debate (Re: A common problem with… Kristian McColm
- Re: [v6ops] NAT debate (Re: A common problem with… Ca By
- Re: [v6ops] NAT debate (Re: A common problem with… Raymond Burkholder
- Re: [v6ops] NAT debate (Re: A common problem with… Kristian McColm
- [v6ops] Is addressing privacy via NAT really achi… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Christian Huitema
- Re: [v6ops] NAT debate (Re: A common problem with… Mark Smith
- [v6ops] 464XLAT -- Re: NAT debate (Re: A common p… Lencse Gábor
- Re: [v6ops] A common problem with SLAAC in "renum… Nick Hilliard
- Re: [v6ops] 464XLAT -- Re: NAT debate (Re: A comm… Ca By
- [v6ops] Stability and Resilience (was Re: A commo… Lee Howard
- Re: [v6ops] A common problem with SLAAC in "renum… Christian Huitema
- Re: [v6ops] Stability and Resilience (was Re: A c… Owen DeLong
- Re: [v6ops] Stability and Resilience (was Re: A c… Michael Richardson
- Re: [v6ops] Is addressing privacy via NAT really … Tom Herbert
- Re: [v6ops] Stability and Resilience (was Re: A c… Tim Chown
- Re: [v6ops] Stability and Resilience (was Re: A c… Timothy Winters
- Re: [v6ops] Stability and Resilience (was Re: A c… David Farmer
- Re: [v6ops] Is addressing privacy via NAT really … Ca By
- Re: [v6ops] Stability and Resilience (was Re: A c… Lee Howard
- Re: [v6ops] Stability and Resilience (was Re: A c… Lee Howard
- Re: [v6ops] Is addressing privacy via NAT really … Tom Herbert
- Re: [v6ops] Is addressing privacy via NAT really … Michael Richardson
- Re: [v6ops] Stability and Resilience (was Re: A c… David Farmer
- Re: [v6ops] Stability and Resilience (was Re: A c… Lee Howard
- Re: [v6ops] Stability and Resilience (was Re: A c… Owen DeLong
- Re: [v6ops] Is addressing privacy via NAT really … Ca By
- Re: [v6ops] Is addressing privacy via NAT really … Tom Herbert
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] Stability and Resilience (was Re: A c… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] Stability and Resilience (was Re: A c… Fernando Gont
- Re: [v6ops] Stability and Resilience (was Re: A c… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ted Lemon
- Re: [v6ops] A common problem with SLAAC in "renum… Lee Howard
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Ted Lemon
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… STARK, BARBARA H
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Tim Chown
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Tim Chown
- Re: [v6ops] A common problem with SLAAC in "renum… Ole Troan
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Mark Smith
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… Michael Richardson
- Re: [v6ops] A common problem with SLAAC in "renum… Mikael Abrahamsson
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… Lorenzo Colitti
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] Is addressing privacy via NAT really … Behcet Sarikaya
- Re: [v6ops] A common problem with SLAAC in "renum… 神明達哉
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… 神明達哉
- Re: [v6ops] A common problem with SLAAC in "renum… Fernando Gont
- Re: [v6ops] A common problem with SLAAC in "renum… Owen DeLong
- Re: [v6ops] A common problem with SLAAC in "renum… Richard Patterson
- Re: [v6ops] A common problem with SLAAC in "renum… 神明達哉