topic DNS Name Resolver in Operating System - HP-UX

DNS Name Resolver

Michelle Barton — Thu, 18 Mar 2004 11:59:25 GMT

I have an 11i DNS HPUX server which hosts our primary DNS entries for all of our Unix servers. My network folks have recently rolled out a windows DNS server which I need to setup on our Unix server too. Basically, I want DNS to look first at the unix server and if it can't resolve it there, go look in the Windows server. Can someone point me in the right direction? I know I could go search the manual, but I thought someone might know quickly.

Thanks,
Michelle

Re: DNS Name Resolver

Steven E. Protter — Thu, 18 Mar 2004 12:05:23 GMT

You can set up the windows DNS as the secondary dns server in /etc/resolv.conf

SEP

Re: DNS Name Resolver

Sundar_7 — Thu, 18 Mar 2004 12:06:01 GMT

Hi,

You would like ur DNS clients to try ur Unix DNS server first and then try the windows server if it cannot get the query resolved from the Unix server ?

As far as I can reach, I dont think this is possible. You can have your DNS clients contact the Windows DNS server in case YOUR UNIX DNS server is not available completely.

The best you can do is to setup your UNIX DNS server to forward the queries to ur Windows DNS server anything it doesnt know how to handle.

Sundar.

Re: DNS Name Resolver

Geoff Wild — Thu, 18 Mar 2004 14:56:14 GMT

Is your Windows DNS going to be just a secondary? Are you running Dynamic Updates? If you are talking just the resolver, then in /etc/resolv.conf on unix hosts, add (next line) the ip of the Windows DNS AFTER your Unix DNS server's IP.

Rgds...Geoff

Re: DNS Name Resolver

James A. Donovan — Thu, 18 Mar 2004 15:30:08 GMT

Editing your resolv.conf won't help you. If the first line of your resolve.conf points to your HP-UX DNS server and you get a response of any kind (even host not found), then the second server will never be looked at.

You need to get your DNS servers to talk to each other.

This link has the documentation for Bind 9.2 on HP.

http://docs.hp.com/hpux/onlinedocs/5990-6785/5990-6785.html

Re: DNS Name Resolver

Thomas Bianco — Fri, 19 Mar 2004 08:55:24 GMT

"forwarder" is the option that you need. We have the opposite setup (windows hierarchy with a Unix forwarder). This is an easy one: add "forwarders " to your named.conf on the DNS server.

I talked about this option at the bottom of this: http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=418909

Re: DNS Name Resolver

Sanjay_6 — Fri, 19 Mar 2004 09:56:50 GMT

Hi,

on your unix server, edit /etc/resolv.conf and put the second dns server ip address over there,

domain some_name.some_domain.com
nameserver ip_add_of_primary_dns_server
nameserver ip_add_of_secondary_dns_server

In this situation, if the system is unable to resolve the ip address of a system using the primary dns server (hp) it will use the secondary dns server (win) to resolve the ip address and vice versa.

Hope this helps.

Regds