newb alert: how to make v4 and v6 "A" records resolve to same website

[Karl Auer]

On Wed, 2010-07-14 at 22:04 -0400, Joseph S D Yao wrote:
> > but how we transform the A record in AAAA
> There is no such translation.  Rather, there used to be, but it has been
> deprecated (that is, it's not supposed to be used any more).

The IPv4-compatible IPv6 address is indeed deprecated, but there is a
non-deprecated method; the IPv4-mapped IPv6 address (section 2.5.5.2 in
RFC 4291):

   ::ffff:a.b.c.d

where a.b.c.d are the four octets, represented in decimal, of an IPv4
address.

However, this just allows an ordinary IPv4 address to be "packaged" in
an IPv6 address. An application that understands this format will just
extract the IPv4 address and use it *as an IPv4 address*.

It's not a "transformation" in the sense that the OP seems to want.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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