topic Re: Reverse name resolution in Operating System - HP-UX

Reverse name resolution

Sandile — Tue, 17 Sep 2002 10:02:07 GMT

Hi all
On my system when I do nslookup on hostnanme I do get the Ip 's attached to that host name .But when I do nslookup on Ip address I get name error.
Please help
Sandile

Re: Reverse name resolution

harry d brown jr — Tue, 17 Sep 2002 10:07:05 GMT

It would help if we knew what the DNS server is. Is it defined to do such?

live free or die
harry

Re: Reverse name resolution

Dirk Wiedemann — Tue, 17 Sep 2002 10:07:49 GMT

Hello Sandile,

in the DNS server there must be two entries for every system. One entry is for name resolution (name --> ip), and one is for reverse name resolution (ip --> name). Seems that your dns tables are not up to date.

regards
Dirk

Re: Reverse name resolution

John Bolene — Tue, 17 Sep 2002 11:40:14 GMT

So do you do the DNS?

If so, you are missing the

db.reverse lookup files.

these will look like db.1.168.192 for a domain of 192.168.1

otherwise get in touch with your DNS admin

Re: Reverse name resolution

Ashwani Kashyap — Tue, 17 Sep 2002 14:43:54 GMT

laso try bouncing the named daemon on your DNS Server .

Re: Reverse name resolution

Rita C Workman — Tue, 17 Sep 2002 14:52:02 GMT

You might also check your /etc/hosts file.
See if there is an error there.

Just a thought,
Rita

Re: Reverse name resolution

Anil C. Sedha — Tue, 17 Sep 2002 15:05:39 GMT

Hi Sandile,

I agree with someone who posted an answer earlier, that you need to have a reverse hostname resolution (host to ipaddress and ipaddress to host).

I think that should resolve your issues. This will happen only if you are getting the correct ipaddress when you do a nslookup for system name.

If you don't pls let us know.

Regards,
Anil

Re: Reverse name resolution

ASO CENTRAL — Tue, 17 Sep 2002 16:50:30 GMT

Reverse lookup is often forgotten by DNS administrators, especially if the DNS server is based on a PC or designed primarily for PC usage. However, it is crucial to require your DNS server to provide reverse lookup. It is a serious security risk (IP address spoofing) to not have this feature and commands like remsh, rlogin, rcp will fail.

Re: Reverse name resolution

Sandile — Wed, 18 Sep 2002 04:52:57 GMT

Hi all

Guys thanks very much for your support ,now it is working fine.Both dns files were there but now there was a problem with the named.boot file. I cleared the misprint there and now its working fine.