Pekka Savola wrote:
>>In any case, communications with e.g. old IPv6 nodes that do not yet >>support MIPv6 are always possible without any other problems than >>non-optimal routing. > > Are you sure these are the only problems? It seems to me, that these old > IPv6 nodes's, ie. no support for even HAO, cannot even talk to mobile > nodes until receiving an ICMP message (one roundtrip). > > Perhaps I missed something? In order to use the HAO, you'll have to establish a BCE. In order to establish a BCE, you'll have to complete the return routability procedure. Any nodes is of course free to refuse participating the return routability procedure or accepting a binding, say due to lack of memory. If the MN can't establish a binding, it won't use Route Optimization, won't use HAO, and from the point of view of the CN, the MN looks like a stationary node. Obviously mobile nodes would initiate/continue traffic in the unoptimized way i.e. through the home agent until they have established BCE at the CN. So I don't think there are any lost roundtrips with the regular traffic, though of course they may be few useless signaling messages if the MN tries to establish a binding but the CN refuses. But I believe this should be attempted in parallel with the regular IP traffic. Jari -------------------------------------------------------------------- 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] --------------------------------------------------------------------
