On Friday, September 27, 2013 02:53:06 PM Jim Pingle wrote:

> It is only a requirement for SLAAC, yes, but it's also
> recommended quite strongly in various RFCs and other
> docs from the IETF.

Well, the RFC's haven't always bent themselves toward best 
practice, just recommendation.

And given that we're still all trying to understanding IPv6 
in practice, I expect more recommendations to follow in 
coming years.

> The IETF wants /64's everywhere (which IMHO is quite
> wasteful, but ...)

The argument is that IPv4-thinking in an IPv6 world is 
counter-intuitive. But the other argument says we always 
thought 32 bits would be more than enough, just like 640KB 
of RAM should have been :-).

No one really knows how long IPv6 will last, especially if 
you walk away from today's thinking.

> It may work perfectly well for some things, but not
> others. I'm not sure I trust everything else to properly
> adhere to what _should_ work... :-)

8x years running /112's on LAN's and no issue.

There are discussions about ASIC or NPU optimization in 
route lookups, code that is expecting a certain prefix 
length, e.t.c.

I don't buy it, but that's just me :-).

Mark.

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