bind 9.16.7 Odd query error

[Borja Marcos]

Hello,

I have an odd problem running bind at home. Shortly after flushing the cache I get a SRVFAIL
asking for 8.8.8.8.in-addr.arpa. PTR

; <<>> DiG 9.14.8 <<>> 8.8.8.8.in-addr.arpa. PTR
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 2731
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 487f9d958627753d010000005f7335b3f026bc7b8f6d5a24 (good)
;; QUESTION SECTION:
;8.8.8.8.in-addr.arpa.		IN	PTR


After compiling bind with trace enabled and setting up a debug channel I can only see these errors:

<179>1 2020-09-29T15:25:07.992319+02:00 elnuc named 96467 - - query client=0x80659c968 thread=0x800f4de00 (8.8.8.8.in-addr.arpa/PTR): query_gotanswer: unexpected error: failure

client @0x80659c968 192.168.1.205#62912 (8.8.8.8.in-addr.arpa): query failed (failure) for 8.8.8.8.in-addr.arpa/IN/PTR at query.c:6922



No clue about the cause of this.

The server is using both IPv4 and IPv6 and it works if I disable IPv6. As far as I know I have no IPv6 connectivity problems.

Any ideas about that “unexpected error: failure”? After several seconds the query works.



Thanks!






Borja.