On Thu, 14 Aug 2003, Tim Chown wrote: > On Wed, Aug 13, 2003 at 02:57:05PM -0400, Keith Moore wrote: > > > > IPv6 gives users better ways to solve some problems (renumbering, > > attachment of a home network) whereas in IPv4 NATs were the > > best tools available. > > So where are the cost savings in renumbering an IPv6 network as opposed to > renumbering an IPv4 network? This would be an interesting question to expand > on I think...
renumbering an IPv4 network: - The 1st critical parameter is *size*. *if* you are not using dhcp, even in an /27 segment (30 hosts if 100% used) it can be real hard to renumber. it consumes *time*, although being a simple/basic task. If you have a /24 or /23, well.. it is a real pain. - The 2nd critical parameter is how many "hard-wired" addresses (regarding services) you have inside it. dns servers are usually the biggest pain. if you use dhcp, resolvers are not a problem (if they are inside the network being renumbered), you just have to change a parameter in the dhcp server, if not it is a pain. but the trickiest/hardest part usually lies with authoritative nameservers -- If your "upper levels" (forwards and reverses) aren't fast enough to respond, you will think twice before going into a renumber. :-) renumbering an IPv6 network: - The 2nd critical parameter i've mentioned is also valid for IPv6. :-((( One more comment: Renumbering from 6BONE addresses to RIR addresses... it might be a good solution/idea to still route the /128s associated with addresses that are in somewhat way hard-wired to some services, as part of the phase-out process. e.g: keep the routing to 3FFE:XYZW:1:2::1/128 in your IGP to 2001:XYZW:1:2::1/128, but stop configuring 3FFE:XYZW:1:2::/64 on its gateway/router. This will prevent other machines to get a prefix in 3FFE, but still guarantees the connectivity to one single server in the "6bone context". Regards, ./Carlos "Upgrade the Internet! -- Now!" -------------- [http://www.ip6.fccn.pt] http://www.fccn.pt <[EMAIL PROTECTED]>, CMF8-RIPE, CF596-ARIN, Wide Area Network Workgroup FCCN - Fundacao para a Computacao Cientifica Nacional fax:+351 218472167 "Internet is just routes (125953/461), naming (millions) and... people!" -------------------------------------------------------------------- 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] --------------------------------------------------------------------
