Minimum IPv6 size

[brandon at rd.bbc.co.uk (Brandon Butterworth)]

> > It might be worth relaxing filtering within 2001::/16.  The RIPE NCC
> > appears to be making /48 PI assignments from within 2001:678::/29  
> > (e.g. the
> > RIPE Meeting next week will be using 2001:67c:64::/48)
> 
> Why the whole /16 rather than just that /29 and a few other blocks set  
> aside for /48s?

Indeed, and why jumble these up, there's enough space to keep different
allocation types separate and have no confusion with just a few trivial
filters, universally deployed, which I suggest is the only way to stop
degeneration.

If one ISP deviates it creates pressure on others to accept the same.
Then we're heading for another v4 mess as people will continuously push
the boundary.

> There are a lot of /48s in a /16, so protecting  
> against someone accidentally deaggregating their allocated /32 into / 
> 48s seems legitimate.

And some will deaggregate to protect against others advertising more
specifics

brandon