Hello again Thomas, Thomas Narten wrote:
> The problem is that this doesn't seem to work in all cases. If the > visited site is using SL addresses, the above rule means that the MN > can't use them (for conversing with local nodes, at least not while > using its Home Address). In other words, things that work one way for > a regular node at the visited cite, won't work for the MN. That > doesn't seem like a desireable property. I guess the Mobile IPv6 specification is not supposed to cover cases where the mobile node is not using Mobile IPv6. Then, if a mobile node wants to use visited site-local addresses for communication within the visited site, that should be O.K. If the mobile node IS using Mobile IPv6 with a global care-of address, then ...? should it use that global care-of address for other communications (e.g., very short term) for which the home address is not involved? > > So far, when we have had problems, we have made restrictions > > (as just noted) so that indeed Mobile IPv6 just works. Sometimes > > the restrictions could be lifted by specifying additional protocol, but > > at this point the amount of additional protocol is to be reduced, > > even at the cost of some restriction. > > My comments were prompted by my reading of the MIPv6 spec. IMO, the SL > wording there has problems. In a few places, it says things like "if > you are visiting a network with the same site as your home, then > ...". But, AFAIK, we have know of no way of determining what site a > node is connected to when it visits some arbitrary link. > That is true, and it was discussed. The conclusion we came up with is that a mobile node might erroneously use a visited site-local address as a care-of address, but that its home agent would never see the Binding Update, so the mobile node would not be able to establish communications with its home site using the visited site-local address. This is the same, effectively, as the case where the node is not using Mobile IP at all. Regards, Charlie P. -------------------------------------------------------------------- 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] --------------------------------------------------------------------
