Subject: Re: [16ng] is access router an oracle

From: Pars Mutaf <[email-masked]>
Date: Tue, 01 Aug 2006 16:39:19 +0200

On Mon, 2006-07-31 at 16:08 +0200, Pars Mutaf wrote:
> On Mon, 2006-07-31 at 18:37 +0900, JinHyeock Choi wrote:
> > 
> > The address uniqueness is doubly assured by 1) compurter's generating
> > random IID and 2) AR's knowing all the address to detect a duplicate
> > without multicast. However, it may be ok for us to just rely on 1) by
> > setting DupAddrDetecTransmits =0.
> 
> 
> If 16ng can mandate or recommend the use of random IIDs, 
> and a good random number generator, then the
> DAD issue is close IMHO. We can reach address collision probabilities 
> as low as e.g. 10^-10. We don't need a better solution 
> (personally I don't think we have a better solution). We should be 
> more worried about the probability of being hit by lightning. 
> 
> That is, everything is all right.
> 
> In addition:
> 
> Who says that DAD detects all collisions?? What if there were 
> a collision (I would be very surprised) but the DAD packet were 
> lost? 
> 
> You know... the wireless packet error rate is not always that that 
> low. 

Regarding the possibility of not doing DAD (because there is no such
thing as an oracle): the SEND working group discussed the same issue 
in the past:

http://standards.ericsson.net/lists/ietf-send/msg00502.html

Looks like the issue is not close. 

May be 16ng may reconsider this possibility. In Wimax there is 
a stronger need imho.

pars

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