 | | | Name lookup question | Name lookup question 2005-05-12 - By Collins, Kevin [MindWorks]
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Thanks for that link - very specific to my question :)
Kevin
-- --Original Message-- --
From: taroon-list-bounces@(protected)
[mailto:taroon-list-bounces@(protected)] On Behalf Of Jeremy Davis
Sent: Thursday, May 12, 2005 8:44 AM
To: Discussion of Red Hat Enterprise Linux 3 (Taroon)
Subject: Re: Name lookup question
Collins, Kevin [MindWorks] wrote:
> Hi,
>
> If I attempt a ping to one of those aliases, all works well - the name
> is resolved to IP and the ping succeeds. However, if I attempt to use
> the nslookup or host command to lookup the alias manually, it fails
with
> a SERVFAIL error.
>
> Shouldn't these commands be using the name service switch just like
the
> rest of the OS, or am I spoiled because HP-UX works the "right" way?
>
nslookup is sometimes modified by the reseller to do non-DNS things.
BIND and its tools, including nslookup, are often bundled with the
operating system by the vendor. Several vendors supply versions of BIND
and its tools that the vendor has made modifications to. These vendors
supply their own modified versions of nslookup that "for convenience"
bypass the DNS and use extraneous sources of information such as
/etc/hosts and NIS.
Such modifications make nslookup unsuitable as a tool for DNS problem
diagnosis, since one cannot determine whether a problem that (such a
modified version of) nslookup reports is a DNS problem or a problem with
performing lookups using one of the other sources of information.
http://homepages.tesco.net/~J.deBoynePollard/FGA/nslookup-results-differ
ent-to-ping.html
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