IPv6 AAAA vs. CNAME for same domain name

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I reach my home site
through a DynDNS name, and also have tunneled IPv6
there.

In the DNS zone, I
have:

myhomesite CNAME
            example.dyndns.org.

How
do I simultaneously point "myhomesite" to an AAAA record? If I trivially make
it

myhomesite CNAME
            example.dyndns.org.
myhomesite AAAA
            2001:db8::1:2:3:4

the
zone is invalid (CNAME and other data).

Can you
suggest a way for having the CNAME record and the AAAA record visible behind the same
domain name?

What I'm not looking for is an
".ipv6."-infixed record, which already is in place.

Answer

I copy from DNS for href="http://zytrax.com/books/dns/" rel="noreferrer">Rocket
Scientists:

CNAME RRs cannot have any other RRs
with the same name, for example,
a TXT
- well that was true until DNSSEC came along and in this case RRSIG,
NSEC and
certain KEY RRs can now occupy the
same
name.

Therefore
what you want to do cannot be done using a CNAME. Use the CNAME to access your homesite
via IPv4 and have a myhomesite-v6 AAAA record point to the IPv6
address

If you do not want such a solution, you
have to implement a mechanism that updates your DNS zone each time your IP address
changes with:

myhomesite IN A
            IPv4.add.ress
 IN AAAA
            IPv6.add.ress

But that
depends on the API (if any) that your DNS provider exports to you. For example if I had
root access on the DNS server, I would periodically host -t a example.dyndns.org and use the output to update the zonefile with the IPv4
address for myhomesite.

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