On Fri, Dec 21, 2007 at 01:33:15PM -0500, Deepak Jain wrote:
For example... Within one's own network (or subnet if you will) we can absorb all the concepts of V4 today and have lots of space available. For example... for the DMZ of a business... Why not give them 6 bits (/122?) are we anticipating topology differences UPSTREAM from the customers that can take advantage of subnet differences between /64 and /56 ?
I am confused on this point as well. IPv6 documents seem to assume that because auto-discovery on a LAN uses a /64, you always have to use a /64 global-scope subnet. I don't see any technical issues that require this though. ICMPv6 is capable of passing info on prefixes of any length - prefix length is a plain old 8bit field. In fact, until I read the ARIN documents to receive an assignment at work, I assumed this would be how people would operate. So what's the concern? Give all end users a /64 and let them subnet that as they see fit. If DHCPv6 would take care of it automatically with shorter prefixes, that's fine - I doubt it cares if it's doling out info for a /56, /64, or /96. Not like anything on the public internet is going to care a lick either. -- Ross Vandegrift ross@kallisti.us "The good Christian should beware of mathematicians, and all those who make empty prophecies. The danger already exists that the mathematicians have made a covenant with the devil to darken the spirit and to confine man in the bonds of Hell." --St. Augustine, De Genesi ad Litteram, Book II, xviii, 37