Re: Using IPv6 with prefixes shorter than a /64 on a LAN

[Owen DeLong <owen () delong com>]

On Jan 25, 2011, at 2:07 PM, Valdis.Kletnieks () vt edu wrote:

> On Tue, 25 Jan 2011 16:17:59 EST, Ricky Beam said:
> > On Mon, 24 Jan 2011 19:46:19 -0500, Owen DeLong <owen () delong com> wrote:
> > > Dude... In IPv6, there are 18,446,744,073,709,551,616 /64s.
> >
> > Those who don't learn from history are doomed to repeat it.
> >
> > "Dude, there are 256 /8 in IPv4."
> >
> > "640k ought to be enough for anyone."
> >
> > People can mismange anything into oblivion.  IPv6 will end up the same  
> > mess IPv4 has become. (granted, it should take more than 30 years this  
> > time.)
>
> To burn through all the /48s in 100 years, we'll have to use them up
> at the rate of 89,255 *per second*.
>
> That implies either *really* good aggregation, or your routers having enough
> CPU to handle the BGP churn caused by 90K new prefixes arriving on the Internet
> per second.  Oh, and hot-pluggable memory, you'll need another terabyte of RAM
> every few hours.  At that point, running out of prefixes is the *least* of your
> worries.
This presumes that we don't run out of /48s by installing them in routers a /20 at a time.

Owen