Nslookup not showng TTL

Adam Tkac atkac at redhat.com
Thu Oct 15 08:47:39 UTC 2009


On Thu, Oct 15, 2009 at 09:06:56AM +0100, John Horne wrote:
> Hello,

Hi,

> Using BIND 9.5.1 it seems that the nslookup command is not showing the
> TTL value of found records. It makes no difference if I set 'debug' or
> 'd2'. Example:
> 
> ==============================================================
> nslookup
> > set debug
> > www.plymouth.ac.uk
> Server:         127.0.0.1
> Address:        127.0.0.1#53
> 
> ------------
>     QUESTIONS:
>         www.plymouth.ac.uk, type = A, class = IN
>     ANSWERS:
>     ->  www.plymouth.ac.uk
>         canonical name = extranet.plymouth.ac.uk.
>     ->  extranet.plymouth.ac.uk
>         internet address = 141.163.163.185
>     AUTHORITY RECORDS:
>     ->  plymouth.ac.uk
>         nameserver = dns0.plymouth.ac.uk.
>     ->  plymouth.ac.uk
>         nameserver = dns1.plymouth.ac.uk.
>     ADDITIONAL RECORDS:
>     ->  dns0.plymouth.ac.uk
>         internet address = 141.163.1.250
>     ->  dns1.plymouth.ac.uk
>         internet address = 141.163.177.1
> ------------
> www.plymouth.ac.uk      canonical name = extranet.plymouth.ac.uk.
> Name:   extranet.plymouth.ac.uk
> Address: 141.163.163.185
> >
> ==============================================================
> 
> 
> How can I see the TTL value using nslookup?

I'm not sure how force nslookup to show TTL but the `dig` utility is
far more better tool for getting such information:

----
$ dig www.plymouth.ac.uk

; <<>> DiG 9.7.0a3-RedHat-9.7.0-0.5.a3.fc13 <<>> www.plymouth.ac.uk
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17054
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 2

;; QUESTION SECTION:
;www.plymouth.ac.uk.            IN      A

;; ANSWER SECTION:
www.plymouth.ac.uk.     3143    IN      CNAME
extranet.plymouth.ac.uk.
extranet.plymouth.ac.uk. 85943  IN      A       141.163.163.185

;; AUTHORITY SECTION:
plymouth.ac.uk.         85943   IN      NS      dns1.cs.strath.ac.uk.
plymouth.ac.uk.         85943   IN      NS      dns0.plymouth.ac.uk.
plymouth.ac.uk.         85943   IN      NS      dns1.plymouth.ac.uk.
plymouth.ac.uk.         85943   IN      NS      dns2.cs.strath.ac.uk.

;; ADDITIONAL SECTION:
dns1.cs.strath.ac.uk.   42744   IN      A       130.159.196.126
dns2.cs.strath.ac.uk.   42743   IN      A       130.159.196.125
----

Regards, Adam

-- 
Adam Tkac, Red Hat, Inc.



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