Maintained by: NLnet Labs

[Unbound-users] dig fails intermittently, but unbound-host does not

Andrew Hearn
Tue Mar 29 11:30:23 CEST 2011


We have version 1.3.4 on a server and have an odd, intermittent, problem
with looking up a particular record.

We have other unbound and bind servers that don't have this problem.


[root at a log]# unbound-control flush
[root at a log]# dig @localhost

; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> @localhost
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 60335
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;			IN	A

;; Query time: 73 msec
;; WHEN: Tue Mar 29 10:20:56 2011
;; MSG SIZE  rcvd: 32

[root at a log]# unbound-host -v has address (insecure) has no IPv6 address (insecure) mail is handled by 3 (insecure) mail is handled by 2 (insecure)

Sometimes the dig @localhost works, others it does not.

It seems to only be this domain that we have problems with.

I suspect there are better ways to diagnose this, or to log more
verbose? Have you any suggestions as to what steps I should be taking

The server, if it helps, is I'd happily upgrade, but would
rather find out why this is happening first.