Hi Tony,
> True, but the term 'hand-off' implies a make-before-break process, else
> the MN is just establishing itself on a new link. Given it has the
> opportunity to be aware of multiple links, it can decide when to switch.
> I am arguing that it complete DAD 'before' it makes that decision, not
> after.
I don't think we can consider all "handoffs" as 'make-before-break'.
There exists some link-layer technologies that allow this,
but not all have such capability.
Completing DAD before handover requires either movement anticipation
or make-before-break, both of which are not widely applicable.
Therefore solving DAD latency for general case is a valid
approach, imo.
alper
>
> Tony
>
> > -----Original Message-----
> > From: Pekka Savola [mailto:[EMAIL PROTECTED]]
> > Sent: Tuesday, October 15, 2002 1:32 PM
> > To: Tony Hain
> > Cc: 'Nick 'Sharkey' Moore'; [EMAIL PROTECTED]
> > Subject: RE: Optimistic DAD draft ...
> >
> >
> > On Tue, 15 Oct 2002, Tony Hain wrote:
> > > [...] it would seem the prudent thing for a MN to do is
> > establish DAD
> > > for all candidate prefixes well before it is ready to start using
> > > them. [...]
> >
> > Isn't there a problem with how this could be done, as
> > currently specified?
> >
> > One can't perform DAD before being on the link.
> >
> > > > -----Original Message-----
> > > > From: [EMAIL PROTECTED]
> > > > [mailto:[EMAIL PROTECTED]] On Behalf Of Nick
> > > > 'Sharkey' Moore
> > > > Sent: Monday, October 14, 2002 7:58 PM
> > > > To: [EMAIL PROTECTED]
> > > > Subject: Optimistic DAD draft ...
> > > >
> > > >
> > > > G'day IPng-ers,
> > > >
> > > > One of the big issues in getting low-latency
> > > > handovers working for IPv6 mobility is the long delay involved in
> > > > completing DAD.
> > > >
> > > > One option is to allow the Mobile Node to communicate
> > > > while the address is still Tentative (optimistically assuming
> > > > that DAD will succeed), but to adjust its ND / SAA behaviour
> > > > in order to minimize disruption in case of an address
> > > > conflict (and maintain correct interoperation with
> > unmodified nodes).
> > > >
> > > > We've kicked the idea around a little on mobile-ip,
> > > > and I've formalized my thoughts into an internet draft,
> > which should
> > > > get published soon. In the meantime, you can find it at
> > > > <http://www.ctie.monash.edu.au/ipv6/fastho.htm>
> > > > (tentatively titled draft-moore-ipv6-optimistic-dad-00).
> > > >
> > > > I'd be interested in your opinions on the draft, and its
> > > > potential suitability for standards track.
> > > >
> > > >
> > > > cheers,
> > > > Nick
> > > > --
> > > > Nick 'Sharkey' Moore <[EMAIL PROTECTED]>
> > > > Research Fellow, CTIE Tel: +61 3 9905 3707
> > > > Monash University, Australia Fax: +61 3 9905 5358
> > > >
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> >
> > --
> > 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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