if a device is only going to recognize one RA prefix, it should probably be the shortest prefix that it sees.
Or, since all prefixes are 64-bits long, it should recognize the first prefix it sees.
so far there is at most one case where it is a good choice - providing a way for local connections to survive renumbering. and there are almost certainly better ways to solve that problem - defining explicit values for minimum time between renumberings and maximum time that a connection should be expected to stay up would be a good start, and they wouldn't be specific to local connections.
I have never understood the emphasis on helping local long-lived connections survive renumbering. There are a plethora of other events that can cause a long-lived connection to drop, so applications already have to be written to re-establish their long-lived connections if they go away. Margaret -------------------------------------------------------------------- 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] --------------------------------------------------------------------
