6to4 is meant to do more than imply it:
> The V4ADDR MUST be
> a duly allocated global IPv4 address, which MUST be unique within the
> private network. The Intranet thereby obtains globally unique IPv6
> addresses even if it is internally using private IPv4 addresses [RFC
> 1918].
And BTW it isn't a draft; it's an RFC. I don't know if the announcement is
out, because I don't seem to be able to receive email this morning, only
send it, but the authors' 48 hour check on the RFC just finished.
Personally I think the answer should be to insist on global addresses
in IPv4-compatible addresses too. The scenarios using NAT addresses here
are too horrible to contemplate.
Brian
Dave Thaler wrote:
>
> I'd like to ask for some general consensus on the following questions:
>
> 1) Are "::10.1.1.1" and "::169.254.1.1" legal IPv6 addresses?
> (They look like global IPv6 addresses, but aren't globally unique.)
> RFC 2373 does not mention any such restriction, and so
> implies "yes".
>
> 2) Similarly, is "2002:0A01:0101:..." a legal IPv6 address?
> The current 6to4 draft implies "no".
>
> 3) Is it reasonable that the answers to the above two questions
> could be different?
>
> (I'd personally rather the answer be the same for both, that
> answer probably being "no", as this avoids a lot of ugly problems.)
>
> And before anyone responds saying that "::10.1.1.1" should be
> allowed so that you can talk between two hosts in a private IPv4
> network, keep in mind that draft-templin-ngtrans-v6v4compat-*.txt
> allows you to do the same thing with "fe80::200:5efe:10.1.1.1", which
> is clearly a link-local address (on an encapsulation link covering the
> private area) and so avoids the ugly problems "::10.1.1.1" has.
>
> -Dave
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Brian E Carpenter
Program Director, Internet Standards & Technology, IBM
On assignment for IBM at http://www.iCAIR.org
Board Chairman, Internet Society http://www.isoc.org
Non-IBM email: [EMAIL PROTECTED]
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