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Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios

Fernando Gont <fgont@si6networks.com> Wed, 13 February 2019 03:18 UTC

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To: Ole Troan <otroan@employees.org>, Christian Huitema <huitema@huitema.net>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>, "v6ops@ietf.org WG" <v6ops@ietf.org>, 6man WG <ipv6@ietf.org>, JORDI PALET MARTINEZ <jordi.palet=40consulintel.es@dmarc.ietf.org>
References: <60fabe4b-fd76-4b35-08d3-09adce43dd71@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> <A40C5116-9474-4F2B-BD94-F57D155ECD4C@employees.org> <b05e3872-d63b-108c-6c00-21b951dad263@si6networks.com> <A9FBBED3-A858-4BB1-A02A-2A06CBEB7662@consulintel.es> <010b2c6d-9c79-9309-aad8-32530c9dab94@gmail.com> <A0201A4B-77BB-40F4-A35F-F1491732D537@consulintel.es> <749b121f-cac5-30e0-686c-9f7f29313d91@huitema.net> <2BAD7ADA-6940-45EA-B7DD-0D82B9E95A05@employees.org> <6440.1549227369@dooku.sandelman.ca> <85C3CE49-93CC -48E1-94FB-46A0203783A2@employees.org> <391AE39D-F754-47A8-B20A-3AEC4C174B9F@huitema.net> <DFDEF631-B6EF-440E-A245-261FBC780BBB@employees.org>
From: Fernando Gont <fgont@si6networks.com>
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Message-ID: <38eb8b47-6ae9-f256-81b4-3313c7f0a83f@si6networks.com>
Date: Tue, 12 Feb 2019 23:37:12 -0300
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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On 3/2/19 21:26, Ole Troan wrote:
> 
> 
>> On 4 Feb 2019, at 01:07, Christian Huitema <huitema@huitema.net> wrote:
>>
>>
>> On Feb 3, 2019, at 11:43 AM, Ole Troan <otroan@employees.org> wrote:
>>
>>>>> The router cannot in its RPF check determine the reason for the wrong
>>>>> source address. If its spoofed or a previously valid address. Therefore
>>>>> code 5.
>>>>
>>>> Right... if the router knew it was the previously valid address, then it
>>>> would know what it was, and could have sent a lifetime=0 deprecate out...
>>>>
>>>> (did I follow you correctly?)
>>>
>>> Yes. Of course it might do both.
>>
>> OK. But then the host knows that it is not engaged in address spoofing, so it could decide to do something about it. That still would be better than calling support.
> 
> Well, this is caused by the ISP, so perhaps the call should be the recommended action. :-)

Not necessarily. There is no requirement that the ISP leases the same
prefix if the client just asks a new prefix.

-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492

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