[131638] in North American Network Operators' Group
Re: Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 -
daemon@ATHENA.MIT.EDU (Owen DeLong)
Sun Oct 31 12:34:22 2010
From: Owen DeLong <owen@delong.com>
In-Reply-To: <171584.1288534952@localhost>
Date: Sun, 31 Oct 2010 09:31:47 -0700
To: Valdis.Kletnieks@vt.edu
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Oct 31, 2010, at 7:22 AM, Valdis.Kletnieks@vt.edu wrote:
> On Thu, 21 Oct 2010 19:21:41 PDT, George Bonser said:
>=20
>> 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.
>=20
> "If Woody had gone straight to a ULA prefix, this would never have =
happened..."
>=20
Or better yet, if Woody had gone straight to PI, he wouldn't have this =
problem,
either.
> 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?
>=20
Which gains what vs. PI?
> 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.
>=20
If you have PI space, changing providers can be even easier and you can =
leave
multiple providers running in parallel.
Owen
