[CentOS] differences in DNS between boxes

Les Mikesell lesmikesell at gmail.com
Wed Aug 5 02:25:50 UTC 2009

Mike -- EMAIL IGNORED wrote:
> On Tue, 04 Aug 2009 18:28:13 -0500, Les Mikesell wrote:
>> Mike -- EMAIL IGNORED wrote:
>>>> If I really want to know what is different between two boxes, I'll do
>>>> something like NFS mount one into the other or rsync their /etc trees
>>>> somewhere on a common host and let diff -r walk through them.
>>> As indicated above, I already know the difference between the two
>>> boxes.
>> I find that a little hard to believe, since they behave differently and
>> you seem not to understand why.
> I have corrected the difference, and they now behave the same.

I thought you said you blocked something with iptables.

>>>> Are you sure this isn't as simple as having (and using, check your
>>>> resolv.conf) a caching name server running on one box so most lookups
>>>> are resolved locally while the other is making the query to something
>>>> slow?
>>> resolve.config is the same on the two boxes.
>> Assuming you mean resolv.conf, is the the first choice one of the boxes
>> in question?
> Yes, resolv.conf ,  I am not sure that I understand the question.
> The resolv.conf for the two boxes are identical.  Each contain two
> router addresses.  I have two nested routers, and each have the
> same two real DNS addresses.

It is common to run a caching nameserver to reduce the traffic for lookups.  I 
thought perhaps you had them configured on both machines but used the same one 
as the first choice.

   Les Mikesell
    lesmikesell at gmail.com

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