> Alper Yegin wrote: >> I don't quite understand this... All CN knows is the RCoA of the >> MN. Only LCoA can reveal the location of the MN within the network. >> And CN cannot figure out LCoA by looking at RCoA. > > What's the difference between a RCoA and a LCoA of a same MN? In my > understanding only the /64 prefix differs. The RCoA prefix is valid > on the MAP subnet and the LCoA prefix is valid in the AR subnet.
I don't think HMIP protocol requires that RCoA and LCoA have the same suffix. RCoA can be configured with a random interface id to break the correlation between the host and RCoA. > > A CN is presented with the RCoA. A CN can have "out-of-band" > knowledge about the prefixes valid under various ARs. Based on this > input, a CN can build the LCoA corresponding to the RCoA. Since CN does not know the location of the MN, it does not know the prefix of LCoA, hence it cannot figure out LCoA by looking at the RCoA. > > That's what I was trying to say, but maybe I fail somewhere. > >> This is so much like what NAT does as far as hiding LCoA is >> concerned. > > To me, there are some common points, but there are also huge > differences. I'm thinking about in NAT there is a specific set of > types of addresses (the not publicly-routable) that can be reused by > any site at will. However, with HMIPv6, the LCoAs must be globally > unique. That's right. This gives the option to use LCoA with a CN if MN wants to. So, location privacy is an optional feature for MN to use, unlike with the NATs. This is nice, because the MN might want to signal its location to some CNs for things like location-based services. alper > > Alex > GBU > > -------------------------------------------------------------------- > 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] > -------------------------------------------------------------------- > -------------------------------------------------------------------- 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] --------------------------------------------------------------------
