Hello I got the subnet 2001:4dd0:fd76::/48 assigned to me. I have setup reverse DNS for the ip6.arpa. zone and registered my dns servers in the web-gui (a.ns.no-way.org, a.ns.audiolink.cc). When I check now the reverse lookups, it only seems to work on ns2.sixxs.net, all other servers return only the SOA informations instead of ns referrals: NS1: root@freeway:/etc/apache2# dig ns @ns1.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; <<>> DiG 9.6-ESV-R1 <<>> ns @ns1.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 10489 ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. IN NS ;; AUTHORITY SECTION: d.f.0.d.d.4.1.0.0.2.ip6.arpa. 604800 IN SOA localhost. hostmaster.sixxs.net. 2011042402 10800 3600 2419200 604800 ;; Query time: 38 msec ;; SERVER: 2001:770:18:8::4#53(2001:770:18:8::4) ;; WHEN: Fri Apr 29 15:23:04 2011 ;; MSG SIZE rcvd: 143 NS3: root@freeway:/etc/apache2# dig ns @ns3.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; <<>> DiG 9.6-ESV-R1 <<>> ns @ns3.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 44451 ;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. IN NS ;; AUTHORITY SECTION: d.f.0.d.d.4.1.0.0.2.ip6.arpa. 604800 IN SOA localhost. hostmaster.sixxs.net. 2011042402 10800 3600 2419200 604800 ;; Query time: 114 msec ;; SERVER: 2620:0:6b0:a:250:56ff:fe99:78f7#53(2620:0:6b0:a:250:56ff:fe99:78f7) ;; WHEN: Fri Apr 29 15:23:20 2011 ;; MSG SIZE rcvd: 143 Correct response from NS2: root@freeway:/etc/apache2# dig ns @ns2.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; <<>> DiG 9.6-ESV-R1 <<>> ns @ns2.sixxs.net 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43417 ;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. IN NS ;; AUTHORITY SECTION: 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. 604800 IN NS a.ns.no-way.org. 6.7.d.f.0.d.d.4.1.0.0.2.ip6.arpa. 604800 IN NS a.ns.audiolink.cc. ;; Query time: 20 msec ;; SERVER: 2001:7e8:1:102::a#53(2001:7e8:1:102::a) ;; WHEN: Fri Apr 29 15:23:38 2011 ;; MSG SIZE rcvd: 142 Is this behaviour intended, do I need to reconfigure something in my Zone-File to make it work? Thank you for your help and kind regards Flavio Curti