On Fri, 9 Oct 1998, Craig Anderson wrote:
The current practice of portability of NZGATE
addresses is fair and fits with
international practice. Any attempt by Telecom or a consortium of ISPs to
limit portability is not a good thing, even if current practice now is for
IP addresses to be most often issued in a non-portable fashion.
Craig, all of the recent (post 1996) RFCs and IETF drafts that I have seen
make it clear that address portability is inconsistent with having a
routable Internet. The regional registries all have policies to
reduce route table fragmentation by migrating organisations to provider
I think Joe pretty much assumed that ISPs were aware of the potential
problems with portability. If any of the major upstream providers of the
New Zealand providers begin to filter small advertisements (say, smaller
than /20) then a lot of NZ organisations with "portable" addresses
could potentially be cut off from the rest of the world.
You can be sure that many of these small routes are not carried globally
and only have connectivity because the origin of the supernet routes gets
the traffic close enough to a provider that doesn't filter.
These small routes are filtered because they would otherwise clog the
memory and CPU of routers carrying a "full table". This affects overall
1) provider based addressing was not widely practiced in 1994.
2) companies obtained class C's from Waikato in that and subsequent
years with the understanding that they were portable.
3) there were no distinctions between which addresses were
in provider blocks and which weren't in those early years.
4) now that we have provider based addressing, it does not make sense
to assume that all the old IP addresses belong to a particular
5) now that we have provider based addressing, it
does not make sense
to impose any new limitations on IP addresses obtained earlier.
Such addresses may easily require the same portability as is now
required of provider blocks.
6) Neither Telecom's (alleged) ideas nor the
fit accepted international practice for historically assigned IP
Could you point me at some info on this "accepted international practice"?
Jamie Clark <jclark(a)clear.co.nz> Ph +64 9 9125636, Fax +64 9 9125008
CLEAR Net http://www.clear.net.nz/
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