Hello there! I am trying to troubleshoot a case of DNS failure issue with one of Indian Govt's domain (nic.in). I can see that 1 out of 4 authoritative DNS server is IPv6 only. We have quite a few users running IPv4 only setup and hence 1/4 of these DNS servers are non-reachable from the recursor hosted by our clients. How is DNS query expected to respond in such case? Will it give SRVFAIL and terminate immediately (causing DNS resolution failure) OR it will just see one of the auth DNS as non-reachable and next will proceed with either of other three thus slowing down but with no failure? Thanks. -- Anurag Bhatia anuragbhatia.com Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter<https://twitter.com/anurag_bhatia> Skype: anuragbhatia.com PGP Key Fingerprint: 3115 677D 2E94 B696 651B 870C C06D D524 245E 58E2