Maintained by: NLnet Labs

[Unbound-users] wanted: troubleshooting cluestick

Joe Abley
Wed Sep 17 04:12:23 CEST 2008


On 16 Sep 2008, at 22:04, Joe Abley wrote:

> but
>
> [monster:~]% dig @127.0.0.1 nanog.org mx
>
> ; <<>> DiG 9.4.2 <<>> @127.0.0.1 nanog.org mx
> ; (1 server found)
> ;; global options:  printcmd
> ;; connection timed out; no servers could be reached
> [monster:~]%
>
> fails, consistently.

And now it's working again:

[monster:~]% dig @127.0.0.1 nanog.org mx

; <<>> DiG 9.4.2 <<>> @127.0.0.1 nanog.org mx
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59427
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 2

;; QUESTION SECTION:
;nanog.org.			IN	MX

;; ANSWER SECTION:
nanog.org.		1550	IN	MX	0 s0.nanog.org.

;; AUTHORITY SECTION:
nanog.org.		13747	IN	NS	dns1.merit.net.
nanog.org.		13747	IN	NS	dns2.merit.net.
nanog.org.		13747	IN	NS	dns3.merit.net.

;; ADDITIONAL SECTION:
s0.nanog.org.		14150	IN	A	198.108.95.20
s0.nanog.org.		14150	IN	AAAA	2001:48a8:6880:95::20

;; Query time: 49 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Sep 17 02:10:43 2008
;; MSG SIZE  rcvd: 156

[monster:~]%

Arrgh. So, perhaps I should rephrase the question. Since I appear to  
have intermittent periods during which MX queries are timing out for  
no apparent reason, what instrumentation can I usefully put in place  
to try and figure out what is going on? I could easily trigger data  
collection from a process watching the exim log for lookup failures,  
for example, but I don't really know what to collect.


Joe