[6bone] DAD scope ??

[Pim van Pelt]

On Sat, Jan 04, 2003 at 04:41:54PM +0800, Keshava Ayanur wrote:
| I would like to know 
| 
| Duplicate Address detection (DAD) scope is only for 
| 	link - for link local address
| Or it appilies even for 
| 
| 	site - for site local address
| 	global - for global unicast address.
Keshava,

DAD is used by nodes on a local wire that can see each other (ie, they
are link-local) to check if the address that they would like to use, is
perhaps already in use by another device.

It is pointless to try DAD in global address space at least, because
the prefix that your router uses is guaranteed to be unique anyway.
For site-local prefixes, I am almost certain that they are not checked 
with DAD.

The answer to your question is thus: DAD is only for the linklocal scope.
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Pim van Pelt                 Email: pim@ipng.nl
http://www.ipng.nl/             IPv6 Deployment
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