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

Valdis.Kletnieks at Valdis.Kletnieks at
Tue Jan 25 16:07:16 CST 2011

On Tue, 25 Jan 2011 16:17:59 EST, Ricky Beam said:
> On Mon, 24 Jan 2011 19:46:19 -0500, Owen DeLong <owen at> 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

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