The Redhat Linux server always try to resolve the local IP addresson the DNS.

[Smith, Albert]

I would check your /etc/nsswitch.conf file and check to make sure that it is looking at the correct information. I have mine and most of my unix servers (especially clusters) to look at the local host file then go to DNS for resolution. If your DNS Server is not finding the address, does this dns server have those entries or does it just serve your external connection (i.e. internet access) most companies have 2 DNS server. 1 on an inside ring for local resolution and 1 in the dmz for external resolution to resolve things off network. The internal DNS Server would forward requests for anything not in it's domain to the external DNS server.
 
If you have a single DNS server that handles internal and external requests I would check to make sure it's updating properly and that your /etc/resolv.conf has the correct parameters. Normally with DNS resolution that is going to the dns servers it normally takes anywhere from 5-60 (I thought it was closer to 5 but I could be wrong) seconds to timeout and go to the next dns server entry in your /etc/resolv.conf and that would repeat until it finds the address or goes through all your DNS servers.
 
 
Albert Smith 
Sr. Unix Systems Administrator
HPCSA, RHCT
Genex Services 
440 E. Swedesford Rd. 
Wayne, PA 19087 
albert.smith at genexservices.com 
(610) 964-5154 

________________________________

From: redhat-list-bounces at redhat.com on behalf of Marco A. Ramos
Sent: Fri 6/3/2005 9:55 PM
To: General Red Hat Linux discussion list
Subject: RE: The Redhat Linux server always try to resolve the local IP addresson the DNS.



OK,  I fixed changing the DNS server.

I made this test the DNS reverse query (dig -x Local ip address) and the DNS
respond with a timeout, I try with other DNS and this new one respond with
no records but respond.

The only question is, is correct that the server always try to resolve the
IP address?

Thank you,

-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com]On Behalf Of Marco A. Ramos
Sent: Friday, 03 June, 2005 6:49 PM
To: redhat-list at redhat.com
Subject: The Redhat Linux server always try to resolve the local IP
addresson the DNS.


The Redhat Linux server always try to resolve the local IP address on the
DNS.



For example if I made a ping to some a local PC the server not respond for a
like 60 seconds, after that display the ping messages, if I put that IP
address on the /etc/hosts file the ping respond immediately, the big problem
with this situation is that the pop3 locals clients can't connect to the
mail server because takes much time making the resolve query and the mail
software client, respond with a timeout error.



This happened with any configuration change.



Information:

-         The DNS is the ISP site

-         The file /etc/host.conf has (order hosts, bind)

-         This happened with all IP address including address from the same
network



Any help?



Thank you all, regards.

Marco


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