Re: draft-ietf-ipv6-ula-central-02.txt

On Jun 21, 2007, at 15:26, Templin, Fred L wrote:
>
> Maybe I am missing the point, but there seems to be an implication  
> that ULA-C necessarily implies IPv6 NAT; am I misinterpreting? If  
> not, then I don't quite understand why this implication is being  
> drawn. Can someone please explain?

I'm not going so far as to say the implication is there.  I'm just  
have a very difficult time taking seriously the concern about merge  
risks associated with renumbering due to the birthday paradox in a  
2^40 number space without something more substantial to go on than a  
bald-faced assertion that any small but non-zero probability of  
collision is unacceptable.  The alternative explanation that makes  
the most sense to me is that some influential organizations, which  
are too small to warrant their own PI space, are resisting migration  
to IPv6 unless they can use NAT with private addresses, and they  
won't [or can't] explain why the arguments in RFC 4864 and draft-ietf- 
v6ops-scanning-implications-03.txt are failing to persuade them.

--
james woodyatt <jhw@apple.com>
member of technical staff, communications engineering

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