At 5:02 PM +0100 2/1/02, Tomas Lund wrote: >On Fri, 1 Feb 2002, Robert Elz wrote: > > > | 3. Is it ok to use longer than a /64 for links ? > > > > That is, the suggestion isn't to pressure people to use /126 or something > > (as your #2 would do), nor to tell people that it isn't OK to use a /64 > >/127 seems alot better? Why waste 50%?
There is yet another factor that limits the interface ID field to be no less than 8 bits wide (i.e., no longer than a /120): RFC 2526 specifies that the highest 127 interface ID values on each subnet are reserved for well-known anycast addresses (as is the interface ID value zero). You need at least 8 bits to hold those 127+1 anycast addresses, in addition to the minimum of 2 IDs needed for the two ends of a point-to-point link. Steve -------------------------------------------------------------------- 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] --------------------------------------------------------------------
