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

Fernando Gont <fgont@si6networks.com> Tue, 26 February 2019 16:11 UTC

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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
To: Lorenzo Colitti <lorenzo@google.com>, Mark Smith <markzzzsmith@gmail.com>
Cc: "6man@ietf.org" <6man@ietf.org>, v6ops list <v6ops@ietf.org>, Fernando Gont <fernando@gont.com.ar>
References: <6D78F4B2-A30D-4562-AC21-E4D3DE019D90@consulintel.es> <a73818d31db7422b99a524bc431b00ed@boeing.com> <CAO42Z2z9-48Gbb_Exf+oWUqDO=axSLpZBtqeDcxkAoFq5OziGw@mail.gmail.com> <CALx6S3624hnGauG1HaSWPMvQw0t2Q5R3gb8W4R8w3kuK7dcrWQ@mail.gmail.com> <1F07F2BB-2F37-4D12-9731-7892DF4E3D88@consulintel.es> <0a582916-af14-bd82-a4cd-002a36f8830b@huitema.net> <67515a73-26a5-3ed0-da88-1a4ce64550d3@foobar.org> <360afa02-cf23-375c-4876-780d3c2aa5ac@gont.com.ar> <CAHL_VyD34V=TRcsCp0DOO9HJNHyy5xkiMQ_cZoBa7zTE4fe5OA@mail.gmail.com> <ead01e0a-9211-7944-88d6-ae8d037c03a8@si6networks.com> <FB8B77EE-CC16-4418-BB5E-D44EE66D6B72@jisc.ac.uk> <29dcc6ed-03f6-3ead-6866-eecbefdf1483@si6networks.com> <F4F90B88-3EED-4AF2-82FE-5F1023A05605@employees.org> <c3562b5b-0eec-636b-3bb1-1b0381109542@si6networks.com> <CAO42Z2y+poR1cHp=wxPDs6umu80uyN94r=bh+NOw2HdFQYZMNg@mail.gmail.com> <CAKD1Yr1fe4MX0ySuwTipSGtVaDxA9vVeR1i3ES2yw3ir=2NMdw@mail.gmail.com>
From: Fernando Gont <fgont@si6networks.com>
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Message-ID: <478244e5-608f-dc3a-a3d9-b7a12f470db1@si6networks.com>
Date: Tue, 26 Feb 2019 13:07:45 -0300
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Hello, Lorenzo,

On 26/2/19 11:27, Lorenzo Colitti wrote:
> FWIW, from a host implementer perspective, DecrementLifetimes is a bad
> idea since it makes it harder to drop duplicate RAs in firmware and thus
> has substantial battery impact.

Well... it would be incorrect for these Lifetime values to span past the
DHCPv6-PD lease time --- so either you set the lifetimes to a small
value (that is never larger than the DHCPv6 lease time, and hence can be
constant), or you have to dynamically adjust the Lifetimes.

If you're filtering RAs in firmware, it would seem to me that the first
option would be better.


-- 
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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