topic Re: dns in Operating System - HP-UX

dns

Chang_6 — Thu, 23 Dec 2004 11:30:54 GMT

Hello,

Could sommebody tell how to configure dns configuration so that it will resolve external addresses like @yahoo.com?

Re: dns

Fred Ruffet — Thu, 23 Dec 2004 11:37:32 GMT

All you have to do is to add lines in /etc/resolv.conf.
For each DNS server your ISP gave you, add a line like this :
nameserver IP
(replace IP by the IP of your DNS server)

Regards,

Fred

Re: dns

Michael Schulte zur Sur — Thu, 23 Dec 2004 11:38:05 GMT

Hi,

you can do it by sam. You can configure a resolver.

greetings,

Michael

Re: dns

Fred Ruffet — Thu, 23 Dec 2004 11:46:09 GMT

Don't forget to configure /etc/nsswitch.conf (can also be done by sam) in order to look in the correct place first. For example, /etc/hosts first, then DNS.

Regards,

Fred

Re: dns

Sanjay_6 — Thu, 23 Dec 2004 11:58:12 GMT

Hi Chang,

You need to configure the resolver using the file /etc/resolv.conf

Check this link from the hp docs to see how to configure the resolver,

http://docs.hp.com/en/B2355-90685/ch03s08.html

Hope this helps.

Regds

Re: dns

Jose Mosquera — Thu, 23 Dec 2004 12:04:02 GMT

Hi,

If you need this for a specific HP-UX sendmail service pls follow this tip:
1.- Identify a resolvable name for your smtp server, i.e: smtpserver
Also assume 8.10.22.100 like IP address for smtpserver.
2.- You must have been set DS macro in your /etc/mail/sendmail.cf:
DSsmtpserver
Pls note that no blanks was leaved.
3.- In your local /etc/hosts file add the following entry:
8.10.22.100 yahoo.com

You can repeat this third step to any domain requested.

Rgds.

Re: dns

Stf — Thu, 23 Dec 2004 13:04:03 GMT

The easyest way to configure dns is:

# set_parms addl_netwrk

after you can adjust by modifying if you want /etc/nsswitch.conf and /etc/resolv.conf...

Stf ;-)

Re: dns

Chang_6 — Sat, 25 Dec 2004 20:06:27 GMT

Hi,

Thank you for the replies. I am still confused. Right now the /etc/resolv.conf has

domain xxxx
nameserver ipaddress1
nameserver ipaddress2

How to add yahoo.com here? Please explain.

Re: dns

Chang_6 — Mon, 27 Dec 2004 10:58:06 GMT

Hi,

Any idea?

Re: dns

Fred Ruffet — Mon, 27 Dec 2004 11:15:40 GMT

You do not add yahoo.com in /etc/resolv.com. The two servers referenced by "nameserver" lines in your file are DNS servers. When you want to find a host (like yahoo.com), you ask them to give the corresponding IP. If they don't know, they ask to another DNS they refer as a master. This master gives reply to yours, so they are able to answer.

Now, if the 2 DNS you have aren't able to answer, following problem may occur :
. Your system isn't configured to use this resolv.conf file. This you can troubleshoot by posting here your /etc/nsswitch.conf file. We will tell you wether it's good or not.
. Your nameservers are not able to resolve yahoo.com. There master DNS can also not resolve. Verify those DNS by configuring them on your worstation and trying to resolve yahoo.com (nslookup command)
. Your server can't reach those DNS servers. Can you ping those nameservers ? Can you issue a DNS query to them ?

Regards,

Fred

Re: dns

Sanjay_6 — Mon, 27 Dec 2004 11:39:16 GMT

Hi chang,

This link might help you understand how the DNS resolution happens.

http://docs.hp.com/en/B2355-90685/ch03s01.html

The whole chapter is useful. Also pay special notice to the section "How BIND Resolves Host Names".

Hope this helps.

Regds

Re: dns

Chang_6 — Thu, 30 Dec 2004 10:09:02 GMT

Fred,

/etc/nsswitch.conf doesn't exist

The following exist

/etc/nsswitch.compat /etc/nsswitch.files /etc/nsswitch.hp_defaults /etc/nsswitch.nis /etc/nsswitch.nisplus

Is this what you meant by a dns query?

nslookup www.yahoo.com
Name Server: autoproxy.xxx.com
Address: xxx.yyy.xx.d

Trying DNS
Trying NIS
looking up FILES
*** No address information is available for "www.yahoo.com"

Re: dns

Chang_6 — Thu, 30 Dec 2004 10:09:51 GMT

And I was able to ping to nameservers

Re: dns

Chang_6 — Thu, 30 Dec 2004 11:29:27 GMT

Hi, also /etc/named.conf doesn't exist.
I think I have to specify soemthing there.
Can anybody tell whats happening here

Re: dns

Sanjay_6 — Thu, 30 Dec 2004 11:32:08 GMT

Hi,

Create a file /etc/nsswitch.conf and try this entry in that file,

hosts : dns files

save this file and exit and then do a nslookup for www.yahoo.com

Hope this helps.

Regds

Re: dns

Stf — Thu, 30 Dec 2004 11:36:27 GMT

did you use a local dns or a public dns?

if you use only local dns try to add an public dns entry in your /etc/resolv.conf file

Stf ;-)

Re: dns

Chang_6 — Thu, 30 Dec 2004 11:42:07 GMT

Hi Sanjay

This is the result:

nslookup www.yahoo.com
Using /etc/hosts on:

looking up FILES
*** No address information is available for "www.yahoo.com"

Re: dns

Sanjay_6 — Thu, 30 Dec 2004 11:51:23 GMT

Hi,

Try this

vi /etc/nsswitch.conf

hosts: files [NOTFOUND=continue] dns

Save this file, exist and now do a nslookup for www.yahoo.com

I'm hoping your /etc/resolv.conf is configured like this

search your_local_domain.com
nameserver 1st_dns_server_ip_address
nameserver 2nd_dns_server_ip_address

you can also use the domain variable in the resolv.conf in place of search.

Hope this helps.

Regds

Re: dns

Stf — Thu, 30 Dec 2004 11:53:08 GMT

ok edit your /etc/nsswitch.conf file and put these line :

hosts: dns [NOTFOUND=continue] files

in your result of nslookup command it seems like that for your request it don't search in the dns...

Stf ;-)

Re: dns

Chang_6 — Thu, 30 Dec 2004 12:00:20 GMT

Hi,

I got this

nslookup www.yahoo.com
Using /etc/hosts on:

looking up FILES
Trying DNS
*** autoproxy.xxx.com can't find www.yahoo.com: Non-existent domain