On Fri, Feb 14, 2003 at 05:14:41PM +0200, Jari Arkko wrote:
>
> I'm trying to understand what the following text means and
> implies in Section 3.3 of RFC 3041:
>
> "Note: because multiple temporary addresses are generated from the
> same associated randomized interface identifier, there is little
> benefit in running DAD on every temporary address. This document
> recommends that DAD be run on the first address generated from a
> given randomized identifier, but that DAD be skipped on all
> subsequent addresses generated from the same randomized interface
> identifier."
G'day Jari,
well, I'm not the author but I can hazard a guess that
this is referrring to the bit of RFC2462 5.4 which says "[...]
an implementation MAY choose to skip Duplicate Address Detection
for additional addresses derived from the same interface
identifier".
> Does this refer to multiple addresses when the link has multiple
> prefixes? Or when multiple temporary addresses are generated in
> sequence?
The former, including the Link-Local Prefix. In practise, a
node implementing 3041 would choose an II, create a Link-Local
Address (LLA) from that II, DAD for the LLA, and then just assume
that any other addresses formed from that II are fine. Always
doing the LLA first gets around the ordering problem you
mention, too.
> Also, it wasn't clear to me whether link-local addresses are
> generated for every new IID or not. If they are, RFC 2462
> rules in Section 5.4 apply and the collision problem may
> be solved that way. (Or does it -- where does it say that
> "first" in 3041 refers to the link-local address?)
I can't find this mentioned explicitly in 3041, no. Which
it probably should be. I've been kicking some of these ideas
around myself, see draft-moore-ipv6-optimistic-dad-02.
cheers,
-----Nick
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