On Thu, 21 Oct 2010 19:21:41 PDT, George Bonser said: > With v6, while changing prefixes is easy for some gear, other gear is > not so easy. If you number your entire network in Provider A's space, > you might have more trouble renumbering into Provider B's space because > now you have to change your DHCP ranges, probably visit printers, fax > machines, wireless gateways, etc. and renumber those, etc. And some > production boxes that you might have in the office data center are > probably best left at a static IP address, particularly if they are > fronted by a load balancer where their IP is manually configured.
"If Woody had gone straight to a ULA prefix, this would never have happened..." If a site is numbering their internal IPv4 stuff to avoid having to renumber on a provider change, then why would they number their IPv6 stuff from provider space rather than ULA space? And remember - (a) IPv6 allows machine to easily support multiple addresses and (b) if you have a provider address and a ULA, changing providers only means renumbering a *partial* renumber of the hosts that require external visibility - your internal hosts can continue talking to each other on a ULA as if nothing happened. Sure beats the mayhem if your company buys an organization and the 1918 spaces the 2 groups use overlap... Yee-hah. ;)
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