North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: v6 subnet size for DSL & leased line customers
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 [email protected] "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
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