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

[Lorenzo Colitti <[e-mail]>]

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 <[e-mail]> wrote:

> > On 17 Aug 2017, at 04:01, Lorenzo Colitti <[e-mail]> wrote:
> >
> > On Thu, Aug 17, 2017 at 11:51 AM, Mark Smith <[e-mail]>
> 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
>
>