Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses)

Sun Oct 31 14:22:32 UTC 2010

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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