[ppml] Solicing comments: IPv4 to IPv6 Migration IncentiveAddress Space
Howard, W. Lee
Lee.Howard at stanleyassociates.com
Wed Jun 27 09:58:06 EDT 2007
> -----Original Message-----
> From: ppml-bounces at arin.net [mailto:ppml-bounces at arin.net] On
> Behalf Of William Herrin
> Sent: Tuesday, June 26, 2007 11:51 PM
> To: Scott Leibrand
> Cc: ppml at arin.net
> Subject: Re: [ppml] Solicing comments: IPv4 to IPv6 Migration
> IncentiveAddress Space
> > * While reservation of a /32 is trivial space-wise,
> reservation of
> > that many distinct IPv6 netblocks, with the
> expectation that they
> > can all be routed, will accelerate routing table growth.
> Since IPv6
> addresses are 4 times the size of IPv4 addresses, that would
> increase the memory demand on routers by a factor of 4. A
> factor of 5 if you consider that they also have to maintain
> the IPv4 table.
"2 to the 64th power" is significantly more than
"4 times (2 to the 32nd power)."
There are roughly 4 billion addresses in IPv4.
There are roughly 18 quintillion subnets in IPv6.
18,000,000,000,000,000,000 > 4*4,000,000,000
Regarding upper limits on the routing table:
* Assuming one and only one contiguous assignment per entity,
and assuming each entity announces only their aggregate, then
if multihoming were not a requirement for a direct assignment,
the 65,000 ASNs is not an upper limit; in fact, the upper
limit is bound by available prefixes.
* These are questionable assumptions.
* CPU is at least as constraining as memory.
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