On Fri, 18 Oct 2002, Alper E. YEGIN wrote:
[...]
> > Optimistic DAD is a useful optimization because DAD is far more
> > likely to succeed than fail, by a factor of at least 10,000,000,000
> > to one[SOTO]. This makes it worth a little disruption in the failure
> > case to provide faster handovers in the successful case, as long as
> > the disruption is recoverable.
> >
> > ==> this is totally, and completely wrong. [SOTO] only provide analysis
> > in *some* cases, in particular autoconfigured vs privacy addresses. For
> > manually assigned addresses, I believe the ratio is closer to 1:10 or
> > 1:100 (unmeasurable, of course).
>
> I must be missing something.. How come this probability is so high?
It's due to the fact how manually assigning works. There are two factors:
1) IID assignment ("which address to use")
2) configuration ("avoiding typos")
It is natural that people doing manual configuration will try to prefer
IID's like ::1, ::2, ::53, ::x etc. and there are much more likely to be
conflicts there; also one should never underestimate the power of fat
fingers :-)
--
Pekka Savola "Tell me of difficulties surmounted,
Netcore Oy not those you stumble over and fall"
Systems. Networks. Security. -- Robert Jordan: A Crown of Swords
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