I trying to get to Sage, and am stuck on the last test, with a rather cryptic message "Delegation chain not complete for IPv6-only"
The domain I'm using is ipv6.in.rs
Going through the resolution process manually, I make it to this point:
$ dig +norecurse -t aaaa ipv6.in.rs @f.nic.rs.
; <<>> DiG 9.8.1-P1 <<>> +norecurse -t aaaa ipv6.in.rs @f.nic.rs.
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1007
;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 4, ADDITIONAL: 3
;; QUESTION SECTION:
;ipv6.in.rs. IN AAAA
;; AUTHORITY SECTION:
in.rs. 3600 IN NS ns1.rnids.rs.
in.rs. 3600 IN NS odisej.telekom.rs.
in.rs. 3600 IN NS ns2.rnids.rs.
in.rs. 3600 IN NS ns1.nic.rs.
;; ADDITIONAL SECTION:
ns1.nic.rs. 3600 IN A 147.91.8.6
ns1.rnids.rs. 3600 IN A 91.199.17.59
ns2.rnids.rs. 3600 IN A 91.199.17.60
;; Query time: 42 msec
;; SERVER: 2001:500:14:6032:ad::1#53(2001:500:14:6032:ad::1)
;; WHEN: Tue Jan 28 16:57:49 2014
;; MSG SIZE rcvd: 169
The DNS servers responsible for rs. do have IPv6 support, and once I query it (non-recursively) for ipv6.in.rs, it will point me towards the authoritative DNS servers responsible for the in.rs domain. Knowing just the names of the servers I need to communicate with at the next step is insufficient, since I'd need to know their address in order to ask them what their address is. That is why the reply I got contains not just the names, but also the IP addresses. This is known as glue records.
For the next step of resolution, an IPv6-only DNS resolver will use one of the AAAA records in the additional section of the reply. Unfortunately, there are no AAAA records. One of the names is outside the in.rs domain, so an IPV6-only DNS resolver would not give up just yet, but if it proceeds with trying the alternative, it will run into the same problem again. So what you need to do in order to proceed is to either get IPv6 support on one of those four name servers hosting the in.rs zone or replicate the zone to another DNS server, which does have IPv6 support. If upgrading one of those four DNS servers to have IPv6 support is not an option, you could instead try using the DNS service offered by HE.