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

Fernando Gont <fgont@si6networks.com> Mon, 04 February 2019 03:11 UTC

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To: Brian E Carpenter <brian.e.carpenter@gmail.com>, JORDI PALET MARTINEZ <jordi.palet=40consulintel.es@dmarc.ietf.org>, Ole Troan <otroan@employees.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Sun, 03 Feb 2019 20:47:13 -0300
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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On 3/2/19 16:41, Brian E Carpenter wrote:
> On 2019-02-04 06:46, JORDI PALET MARTINEZ wrote:
>>     The RIPE document does not recommend it. In Germany, that's the expected
>>     default.
>>     
>> ---->  This is not correct, in the context of another mailing list, a few day ago, some people (including people from Germany) confirmed that this is not true for Germany, neither there is any law or anything similar that requires dynamic prefixes.
> 
> It doesn't matter. The objective fact is that getting a new prefix after a CPE reboot, or after a DSL disconnect/reconnect, or every 24 hours, is common, and not just in Germany.

Exactly.



> Not that I've ever had any stale address problems as a result, even at a time when I was getting multiple ADSL disconnects per day due to a line fault. So with a FritzBox and Windows hosts, the "common problem" simply wasn't a problem.

FritzBox used to generate RAs that would disable the outdated prefixes
in response to packets with a source address that it didn't like. See:
http://blog.si6networks.com/2016/02/quiz-weird-ipv6-traffic-on-local-network.html

That may explain why you didn't have stale addresses :-)

Thanks!

Cheers,
-- 
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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