I have "often" (I'm not sure how often) a SERVFAIL at the first reply, then a normal answer immediately after. For instance:
~ % dig -x 216.66.84.42 ; <<>> DiG 9.5.1-P2 <<>> -x 216.66.84.42 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 18528 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;42.84.66.216.in-addr.arpa. IN PTR ;; Query time: 411 msec ;; SERVER: ::1#53(::1) ;; WHEN: Fri Jul 3 14:56:28 2009 ;; MSG SIZE rcvd: 54 ~ % dig -x 216.66.84.42 ; <<>> DiG 9.5.1-P2 <<>> -x 216.66.84.42 ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34991 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;42.84.66.216.in-addr.arpa. IN PTR ;; ANSWER SECTION: 42.84.66.216.in-addr.arpa. 86392 IN PTR tserv10.par1.ipv6.he.net. ;; Query time: 0 msec ;; SERVER: ::1#53(::1) ;; WHEN: Fri Jul 3 14:56:36 2009 ;; MSG SIZE rcvd: 92 Unbound 1.3.0 on Debian/Linux, no forwarder, using dlv.isc.org. The log is attached. The first request is at 14:56:28, the second at 14:56:36.
unbound.log.gz
Description: Binary data
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