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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 | grep -v '^;'          60      IN      A
...         60      IN      A         60      IN      AAAA    2600:2001::75

(I was expecting to get):          60      IN      A          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?

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up vote 3 down vote accepted

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 | egrep -v '^$|^;'      172680  IN  AAAA    2001:0:53aa:64c:c5b:4f1e:a9c6:61b1

$ dig -t AAAA  | egrep -v '^$|^;' 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 -u vi0oss -p ********** -a 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.

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Don't forget to select this answer as correct when you can, if it solves your problem. – AndrejaKo Jun 9 '11 at 20:38

Unfortunately, DynDns doesn't allow dynamic update of IPv6 addresses. This makes DynDns unusable for me. I am behind a NAT (and I am refused port forwarding), so the only way to get my server online is teredo, but teredo keeps on changing my IPv6 address all the time.

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Really? For me it works (although it took some time to find the right software). I'll update the answer to describe it. – Vi. Jun 21 '11 at 16:57

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