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Re: [v6ops] "The Internet is for End Users" (Re: I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt)

Timothy Winters <twinters@iol.unh.edu> Thu, 17 August 2017 10:48 UTC

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From: Timothy Winters <twinters@iol.unh.edu>
Date: Thu, 17 Aug 2017 10:47:56 +0000
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To: Lorenzo Colitti <lorenzo@google.com>, Tim Chown <Tim.Chown@jisc.ac.uk>
Cc: Simon Hobson <linux@thehobsons.co.uk>, v6ops list <v6ops@ietf.org>
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Subject: Re: [v6ops] "The Internet is for End Users" (Re: I-D Action: draft-ietf-v6ops-unique-ipv6-prefix-per-host-07.txt)
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Most operating systems give up if they fail DAD.

Tim

On Thu, Aug 17, 2017 at 6:22 AM Lorenzo Colitti <lorenzo@google.com> wrote:

> For non-EUI-64 addresses Linux usually retries.
>
> However, the problem is not so much when DAD works as when it *doesn't
> work* (e.g., because devices drop multicast when asleep). In that case you
> end up with duplicate addresses.
>
> On Thu, Aug 17, 2017 at 7:12 PM, Tim Chown <Tim.Chown@jisc.ac.uk> wrote:
>
>> > On 17 Aug 2017, at 04:01, Lorenzo Colitti <lorenzo@google.com> wrote:
>> >
>> > On Thu, Aug 17, 2017 at 11:51 AM, Mark Smith <markzzzsmith@gmail.com>
>> wrote:
>> > "If IPv6 IIDs were reduced to something like 32 bits, would any of the
>> > above be impacted:
>> >
>> > - Available and Reliable: No. May have a positive influence, as
>> > availability and reliability possibly could be increased, as ND cache
>> > resource exhaustion attacks effectiveness would be reduced.
>> >
>> > Actually the answer here is also "yes, negatively". It means that
>> networks with large numbers of users would become unreliable because of IID
>> collisions. There are networks that run 10k or 20k nodes on a single
>> subnet. Large corporate networks are an example, or large conferences such
>> as MWC.
>>
>> Is there info anywhere on what the common OSes do when they encounter a
>> DAD failure - do they give up or try a new tentative address?
>>
>> Tim
>>
>>
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