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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)

Tim Chown <Tim.Chown@jisc.ac.uk> Thu, 17 August 2017 10:12 UTC

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From: Tim Chown <Tim.Chown@jisc.ac.uk>
To: Lorenzo Colitti <lorenzo@google.com>
CC: Mark Smith <markzzzsmith@gmail.com>, Simon Hobson <linux@thehobsons.co.uk>, v6ops list <v6ops@ietf.org>
Thread-Topic: [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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Date: Thu, 17 Aug 2017 10:12:16 +0000
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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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> 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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