Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
"Joel M. Halpern" <jmh@joelhalpern.com> Sun, 03 February 2019 18:30 UTC
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To: Fernando Gont <fgont@si6networks.com>, Mikael Abrahamsson <swmike@swm.pp.se>, Mark Smith <markzzzsmith@gmail.com>
Cc: v6ops list <v6ops@ietf.org>, 6man WG <ipv6@ietf.org>
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> <alpine.DEB.2.20.1902031813310.23912@uplift.swm.pp.se> <23b3ffc3-7f01-6d15-ae93-c0e6932d53a6@si6networks.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Sun, 03 Feb 2019 13:30:08 -0500
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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I have been trying to follow the discussion. I think I have been able to reconstruct the problem being discussed. If I understand correctly, we are talking about CPE behavior when the CPE receives IPv6 prefixes via DHCP-PD, and then advertises prefixes for hust using RA PIO. The assumptions that I believe Fernando is making are: 1) The CPE Does not store its delegations across reboots. 2) The CPE crashes 3) The CPE requests a prefix from DHCP-PD 4) The CPE receives a different prefix than it received before. An Fernando seems to be saying that this results in the CPE violating its "contract" with the hosts from earlier PIO information. Given that if the CPE had stored the delegated prefix, it could have continued to use it, one could equally (and arguably with more justification) argue that the DHCP server violated its contract with the CPE when it did not return the still-valid prefix (with a correct lifetime). After all, the server madea "contract" when it handed over the address. Have I missed something in the "problem"? Robustness is nice. But let's not bend over backwards trying to fix a problem of multiple failures. Yours, Joel On 2/3/19 12:39 PM, Fernando Gont wrote: > On 3/2/19 14:14, Mikael Abrahamsson wrote: >> On Mon, 4 Feb 2019, Mark Smith wrote: >> >>> A first hop CPE rebooting and being given a different PD prefix is >>> effectively changing a transient packet loss event into the movement of >> >> What about if it decides to choose a different /64 out of that /56? Do >> we cover this in any documents? The result to end systems is the same >> regardless if it's different /64 out of the /56 or if it's different /56. > > Agreed. In that case, if it is able to detect that the advertised prefix > has changed, you might *expect* that it also advertises the original one > with appropriate lifetimes. However, that implies that the prefix had > been recorded in stable storage. > > And it all goes back to the same place: > > * expectations != requirements > * Robustness has a lot to do with dealing with entities that might not > behave nicely > > >
- [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