[124112] in North American Network Operators' Group
Re: IP4 Space
daemon@ATHENA.MIT.EDU (Owen DeLong)
Wed Mar 24 03:39:38 2010
From: Owen DeLong <owen@delong.com>
In-Reply-To: <75cb24521003232246q32ea5ccen1e81ef7e91a97946@mail.gmail.com>
Date: Wed, 24 Mar 2010 00:35:38 -0700
To: Christopher Morrow <morrowc.lists@gmail.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
>=20
> apples and oranges.
>=20
When did novell turn orange? I thought they were red. ;-)
>> I'd expect that v4 will still exist in legacy form behind firewalls,
>> but I think its deprecation on the public internet will happen a lot
>> faster than anyone expects.
>=20
> maybe you're right, but... I doubt it.
>=20
>>> I agree that v6 deployments seem to be getting
>>> better/faster/stronger... I think that's good news, but we'll still =
be
>>> paying the v4 piper for a while.
>>=20
>> Only until v4 becomes more expensive (using whatever metric matters =
to
>> you) than v6.
>=20
> I have v4, it's not going to be anymore expensive than it is today for
> me... for new folks sure, but I've got mine.
>=20
If you start deploying IPv6, then, the cost of maintaining duplicate =
security
policies (v4 and v6), duplicate host mappings, duplicate DNS, duplicate
configurations on all your routers, etc. does eventually add up, as does =
the
need for even more TCAM.
These costs may be trivial in small environments, but, for major =
enterprises
and large backbones, these costs will become significant.
An additional not-yet recognized cost of IPv4 will come to light as the =
various
transfer policies start super-fragmenting the address space and our =
TCAMs
begin exploding with new IPv4 routes. Likely there will be scenarios =
where
ISPs need a /16 but they can only find 240 non-aggregable /24s. They'll
snap them up and bam... 240 new IPv4 routes.
The ARIN transfer policies has some safeguards against this, but, most =
of
the RIRs passed transfer policies without these safeguards.
Owen
