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DNS running but not responding

 
Highlighted
Frequent Advisor

DNS running but not responding

Hi,


I have main issue that although the named process is running and listening on port UDP 53. I am not able to query it even locally. When I run nslookup command on the machine itself, it times out and I get the below message.

dns3:/etc #nslookup
*** Can't find server name for address 10.1.156.55: Server failed
*** Default servers are not available
Using /etc/hosts on: dns3


any idea ??

Appreciate your support.

Jean
18 REPLIES 18
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Honored Contributor

Re: DNS running but not responding

> *** Can't find server name for address 10.1.156.55: Server failed

Is 10.1.156.55 the address of the system you
expected to be using as the DNS server? Is
that the address of "the machine itself"?

Does "/etc/hosts" provide a name for address
10.1.156.55? Is it in the DNS data base?
Highlighted
Frequent Advisor

Re: DNS running but not responding

yes, The machine has two IP addresses and Named is listening on both of them.

yes it's defined in the /etc/hosts file.

let me know if you require any other informations.
Highlighted
Frequent Advisor

Re: DNS running but not responding

Could be that it's only checking the hosts files without using the DNS?
Highlighted
Honored Contributor

Re: DNS running but not responding

Is your named process listening on 127.0.0.1?

Look into /var/adm/syslog/syslog.log - if named has a problem, it usually writes messages about it to the system log.

MK
MK
Highlighted
Frequent Advisor

Re: DNS running but not responding

yes named is running on all IPs not only the loopback address.
Highlighted
Frequent Advisor

Re: DNS running but not responding

And to answer the 2nd question question, there is nothing wrong in the syslog messages. it shows that named is loading named.conf and listening on the IP addresses without any errors.
Highlighted
Valued Contributor

Re: DNS running but not responding

Jean,

What does your nsswitch.conf file look like?

Rick
Highlighted
Frequent Advisor

Re: DNS running but not responding

Hi Rick,


The file didn't exist it at the beginning at all. I tried to create it but I am not sure if I have included the correct entry. I tried to put the following entry

hosts: files dns nis

Do you think is this the problem?

Could you please advise?

thanks a lot!
Highlighted
Valued Contributor

Re: DNS running but not responding

Normally you would just copy the one that you want from the samples nsswitch.dns in the /etc directory. Look at the "nsswitch.dns" file in /etc and compare to how yours is setup for the hosts line.

Hope this helps.

Rick