topic Re: DNS resolution issue in Operating System - HP-UX

DNS resolution issue

Timothy P. Jackson — Fri, 13 Jan 2012 18:19:21 GMT

Hello Everyone,

I am setting up sendmail and I am having a problem with DNS resolving.

If I do a nslookup for like www.yahoo.com, it comes back with the error "Name Server 128.1.1.6 Not Found"

From the nslookup prompt if I issue the command "server 128.1.1.6" and then try to look up www.yahoo.com, it works just fine. am i missing something in my resolv.conf file?

Any help would be greatly appreciated!

Tim

Re: DNS resolution issue

Patrick Wallek — Fri, 13 Jan 2012 19:44:53 GMT

Can you please post your /etc/resolv.conf and /etc/nsswitch.conf files?

Re: DNS resolution issue

Timothy P. Jackson — Fri, 13 Jan 2012 21:32:06 GMT

# vi /etc/resolv.conf

"/etc/resolv.conf" 2 lines, 49 characters

domain thnajackson.com

nameserver 192.168.101.10

# vi /etc/nsswitch.conf

"/etc/nsswitch.conf" [Read only] 1 line, 105 characters

hosts: files [NOTFOUND=continue UNAVAIL=continue] dns [NOTFOUND=return UNAVAIL=c

ontinue TRYAGAIN=return]

Re: DNS resolution issue

Timothy P. Jackson — Fri, 13 Jan 2012 21:36:50 GMT

oops sent the information from the wrong server...

# vi /etc/resolv.conf

"/etc/resolv.conf" 2 lines, 49 characters

domain rc.ghbcoleman.com

nameserver 128.1.1.6

# vi /etc/nsswitch.conf

"/etc/nsswitch.conf" [Read only] 1 line, 105 characters

hosts: files [NOTFOUND=continue UNAVAIL=continue] dns [NOTFOUND=return UNAVAIL=c

ontinue TRYAGAIN=return]

Re: DNS resolution issue

Robert_Jewell — Fri, 13 Jan 2012 21:51:03 GMT

your resolv.conf file looks ok.

can you resolve your nameserver or other internal servers? Maybe a routing issue (check netstat -r)?

-Bob

Re: DNS resolution issue

Steven Schweda — Sun, 15 Jan 2012 22:47:24 GMT

Re: DNS resolution issue

Dennis Handly — Mon, 16 Jan 2012 01:21:44 GMT

>oops sent the information from the wrong server...

(You can delete your bogus post by using the post Options menu.)

Is the "wrong" server on the same network?

>If I do a nslookup for like www.yahoo.com, it comes back with the error "Name Server 128.1.1.6 Not Found"

It appears to not like that line in your /etc/resolv.conf.

>who might be able to divine what was in your "resolv.conf" file?

It was provided (twice :-). Note the "nameserver 128.1.1.6" entry and again from the error message.

Re: DNS resolution issue

Nighwish — Mon, 16 Jan 2012 12:18:34 GMT

Hi ..

Simple thinks to check:

more /etc/resolving :

nameserver yy.yy.yy.yy
nameserver xx.xx.xx.xx

You should have two domain server for redundancy. Check the connectivity:

pin yy.yy.yy.yy

Check if you can resolv the names in your network.

If everything is ok.

This I guess it may by a firewall rule that stop the DNS request to out-side your network.

Regards.