[ppml] 240/4

william(at)elan.net william at elan.net
Tue Apr 24 18:10:46 EDT 2007

Entire 240/4 for private use? Is this maybe a bit overreaching?

On Wed, 25 Apr 2007, Paul Wilson wrote:

> Tony,
> The suggestion was to use the space for private use, not for global
> unicast.  The critical difference in private networks is that the operators
> can be expected to know what gear they have and exactly what needs to be
> upgraded, and also that the impacts of any problems are localised.  Many
> such network deployments could occur independently and in parallel without
> impact on the rest of the network.
> A lot of legacy equipment may well be hard to upgrade, but a lot of new
> services these days are being developed or planned using new technologies
> that should be much more amenable to upgrade (set top boxes, VOIP gear,
> appliances etc).
> My other comment in today's session was that I was told last year of a
> planned national telco network deployment which would require 8 /8 blocks
> within the space of 2 or 3 years.  The operator in that case would have
> been happy with private space, if there was enough of it.
> The cost of redesignating the class E address space seems very low, and
> without any downside, for the potential benefits which could occur (even if
> used by only a handful of networks which would otherwise ask for IPv4
> public addresses).
> Paul
> --On Tuesday, 24 April 2007 12:03 PM -0700 Tony Hain <alh-ietf at tndh.net>
> wrote:
>> I just heard a part of Paul's comment about 240/4, and it sounded like
>> Scott commented about implementations being difficult to fix.
>> Even if the vendors implemented a change and shipped it within 18 months
>> (an aggressive window), there is a very, very, very large installed base
>> of systems that can't/won't be upgraded to allow use of a block that was
>> 'undefined' at the time they were tested & shipped. By the time those work
>> their way out of the network, we will be long past the point where the
>> 240/4 block might have been useful.
>> Tony
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