> From: Greg Daley [mailto:[EMAIL PROTECTED]] > > I've been thinking about how we can use MLD to > determine if anyone else is defending an address using DAD. > > The MLD RFC indicates that a node's link-scope multicast > addresses except all-nodes link-scope must be joined > using MLD. > > Since the router receives MLD reports from all devices it > knows whether a multicast group is active on the subnet > (or should that be link(s)?) for which it is the Querier.
There is no requirement today that a router keep any state on link-scoped groups. Hence, in general the router does not know the information you're assuming. Furthermore, there is a proposal under discussion to not do DAD, except on manually assigned addresses. If this proposal is accepted, there's little benefit to trying to optimize DAD any further (certainly not worth asking routers to start keeping extra state). -Dave -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
