How to get dynamic dns entry for ipv6-only host?

Question

The host is behind NAT and uses Teredo to get globally routable.

How to make it easily-reachable? For IPv4 case we just use no-ip or dyndns, however for ipv6 I don't see AAAA replies from dyndns's nameserver even though I specified "IPv6 Address (optional)":

$ dig vi.dyndns.org @ns1.dyndns.org | grep -v '^;'
vi.dyndns.org.          60      IN      A       1.2.3.4
...
ns1.dyndns.org.         60      IN      A       204.13.248.75
ns1.dyndns.org.         60      IN      AAAA    2600:2001::75
...

(I was expecting to get):
vi.dyndns.org.          60      IN      A       1.2.3.4
vi.dyndns.org.          60      IN      AAAA    2001:0:53aa:64c:c5b:4f1e:a9c6:61b1
...

How to make my host known in IPv6 world? Are there services like dyndns or no-ip, but for ipv6?

Solution

Both dyndns and, for example, freedns work, but your testing method is invalid. You should specify that you want AAAA entry in the DNS request:

$ dig -t AAAA vi.dyndns.org | egrep -v '^$|^;'
vi.dyndns.org.      172680  IN  AAAA    2001:0:53aa:64c:c5b:4f1e:a9c6:61b1

$ dig -t AAAA vi0oss.twilightparadox.com  | egrep -v '^$|^;'
vi0oss.twilightparadox.com. 172572 IN   AAAA    2001:0:53aa:64c:c5b:4f1e:a9c6:61b1

In order to dynamically update dyndns entries you can use inadyn program:

inadyn-mt --ip_server_name www.whatismyv6.com -u vi0oss -p ********** -a vi.dyndns.org ip6

It gets address using public "show me my IP" sites, so you should add ipv6 entry of that site to your /etc/hosts it it fails out of the box.

Comments

[Anders]

You shouldn't use Teredo for services. You really should use that as last resort, for clients. But yes, if the service supports IPv6, it usually have a parameter for setting IPv4 or IPv6 address. And if you want to have different auto-selected, they usually uses two different URL:s. And yes, there are other tunneling services. I uses HE services in tunnelbroker.net, there are others. :-)

[user3660103]

Don't forget to select this answer as correct when you can, if it solves your problem.

[Vi.]

Really? For me it works (although it took some time to find the right software). I'll update the answer to describe it.