Hi Alper, > > Sure. Actually, my comment is not against what you are saying here. > I guess an approach like a proxy-DAD can be a candidate solution > to this problem. Another candidate is server-based DAD that I'm > currently working on. It involves a server keeping track of > currently used IP addresses on a subnet, and assisting mobiles > that know how to consult this server.
Certainly Optimistic DAD is not particularly useful until you actually get to the link, but I think it provides a good fallback behaviour for mobile devices on networks which aren't willing to keep state. Stateful mechanisms are certainly more of a candidate for predictive and non-local address acquisition (may be matched with Predictive (Fast) Handovers, Hierarchical MIPv6). These are infrastructure based solutions though. MIPv6 principally operates on a low-infrastructure access network model. Optimistic DAD requires implementation only in the current node, and works with a predictable worst case performance on stock RFC 2461/2462 networks without additional support. I'm not sure which systems will gain a following, but I think that DAD's current 'timeout == success' philosophy will not stay around long. Greg Daley -------------------------------------------------------------------- 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] --------------------------------------------------------------------
