DNS Client Configuration

[Rupinder Sandhu]

Hi all,

Well my first here....

My enquiry is related to changing the

configuration of existing DNS clients to point to a set of two new primary and secondary DNS servers and decommision the old DNS servers.

I have about 50 DNS clients to deal with, 25 of them are development and rest production boxes.

all running a mix of HPUX 11.31 11.23 and 11.11

questions:

1. for each host how do i find what dns server it is pointing to before changes,

2. what files do i need to change to accommodate new dns servers.

3. is there any trap in this process

4. how do i test the new changes.


please suggest me the best practice you will follow to complete above task..

I will highly apreciate your help..

all help welcome.....

Thanks

[VK2COT]

Hello,

1. for each host how do i find what dns server it is pointing to before changes,

ANSWER:

If we assume you do not run any cache-only
DNS servers on your clients, than all
you need to check and change is file

/etc/resolv.conf

2. what files do i need to change to accommodate new dns servers.

ANSWER:

/etc/resolv.conf

3. is there any trap in this process

ANSWER:

No, as long as your new DNS servers
are reachable (in other words, port
53 is not blocked by firewalls).
There is no downtime when making changes.

4. how do i test the new changes.

ANSWER:

Use queries based on commands:

nsquery
dig
nslookup

Typically, test it on a test/development
servers and then proceed with the
production ones.

Cheers,

VK2COT

[Rupinder Sandhu]

Thank you very much Dusan,,,

I really appreciate your help.

[Rupinder Sandhu]

thanks to dusan