Getting a "portable" /19 or /20

Tue Apr 10 20:28:06 UTC 2001

On Tue, Apr 10, 2001 at 03:45:10PM -0400, Greg Maxwell wrote:
> 
> On Tue, 10 Apr 2001, Majdi S. Abbas wrote:
> 
> > On Tue, Apr 10, 2001 at 08:27:54AM -0400, Greg Maxwell wrote:
> > > The reason they don't allocate /24's is because without aggregation the
> > > Internet is not scalable. Perhaps they are being too agressive, but the
> > > reasoning is sound.
> > 
> > 	Aggregation buys time, that's it.  Aggregation does not make the
> > current routing methods any more scalable.
> 
> In IPv4 yes, because you can't have perfect aggregation, too much network
> multihoming and old prefixes and it's to painful to change address blocks.
> 
> In IPv6, if implimented right aggregation provides for virtually limitless
> scalability for unicast traffic.

So long as "implemented right" means "edge sites are no longer
permitted to multi-home at the IP layer". If those are the
constraints of your routing policy, IPv4 will scale too. Very
nicely.

Joe