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In-Reply-To: <20050810173221.GF18662@vacation.karoshi.com.> Cc: NANOG list <nanog@merit.edu> From: Iljitsch van Beijnum <iljitsch@muada.com> Date: Wed, 10 Aug 2005 21:26:08 +0200 To: bmanning@vacation.karoshi.com Errors-To: owner-nanog@merit.edu On 10-aug-2005, at 19:32, bmanning@vacation.karoshi.com wrote: > so renumbering out of a /56 into a /48 is harder than renumbering > out of a /124 into a /112 how? Having a /60 or a /48 is better than a /56 or a /48 because: 1. Most people who are going to encounter the problem realize that a / 60 isn't enough and go for the /48 immediately 2. Going from a /60 to a /48 would happen earlier than from a /56 to a /48 so there is less to renumber. > renumbering - regardless of version > is hard... Not hard, inconvenient. > primarly becuase application developers insist that > the IP address is the nodes persistant identifier, Disagree. There are two issues: the DNS and access restrictions and similar based on IP addresses. The DNS can be fixed with some searching and replacing and/or dynamic DNS updates, but using literal IP addresses, especially in filters and such, isn't easy to solve because there are no reasonable alternatives in many cases. > renumbering hosts is a breese in either > version of predominate IP protocol, DHCP is your friend. That friend will kill all your sessions when you get a new address. DHCP implementations in IPv6 aren't ready for prime time either. > Or if you > want less robust functionality and semantic overload, you can use > the RA/ND stuff in IPv6. How is that less robust and does it imply a semantic overload? > - regardless, renumbering from one address > range to another is painful - CIDR -might- be helpful, but > artifical > constraints e.g /64 only serve to confuse. I agree. All boundaries between different parts of the address must be flexible. That includes the boundary at the end of the address. But I guess we have to save something for IPv7.
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