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sendmail/postfix dns issue...

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sendmail/postfix dns issue... Mail Server Help forum discussing tips, tricks, techniques and Spam containment solutions. Topics include mail servers such as Sendmail and Qmail, webmail interfaces such as Squirrelmail and Horde and spam solutions such as SpamAssassin and Bayesian

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  #1  
Old December 8th, 2003, 11:16 AM
johnmurray johnmurray is offline
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sendmail/postfix dns issue...
Hi,

I'm having trouble figuring out why my smtpd keeps on hitting one of my dns servers. I removed the dns entry from the hosts file and the resolve.cfg file. When I tail the message file, I constantly see failed request to the destination dns. Is there another place the dns entry might be inserted?

--john
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  #2  
Old December 8th, 2003, 03:25 PM
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Quote:
I'm having trouble figuring out why my smtpd keeps on hitting one of my dns servers.

By "hitting" do you mean "attempting to do recursive DNS lookups against"?
Quote:
I removed the dns entry from the hosts file and the resolve.cfg file.

What DNS entry? Do you mean the nameserver entry in /etc/resolv.conf?
Quote:
When I tail the message file

Which message file? Please provide unedited samples from this file that illustrate the problem you're having.
Quote:
Is there another place the dns entry might be inserted?

Your DNS resolvers are defined in /etc/resolv.conf. Various applications on your system will use the nameserver entries in this file to perform DNS lookups. (Exception: dig and other DNS diagnostic tools can be instructed to send their queries directly to certain DNS servers.)
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  #3  
Old December 8th, 2003, 04:35 PM
johnmurray johnmurray is offline
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When I do netstat -uap, I can see the following entry:
udp 0 0 mailserver.c:40794 192.168.0.50:domain ESTABLISHED 26945/smtpd

The 192.168.0.50 is one of 3 name servers I have. How do I stop smtpd from looking at the above DNS?

--john
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  #4  
Old December 8th, 2003, 04:38 PM
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Assuming you've removed it from /etc/resolv.conf, you could try restarting smtpd
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  #5  
Old December 8th, 2003, 04:48 PM
johnmurray johnmurray is offline
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yeah... I already removed it from the resolv.conf. I even rebooted the server. I'm really stuck on this becuase netstat shows me that it's still looking and my /va/log/message is show all sorts of errors because that box no longer exist. Any other ideas why it's still looking at that IP?

--john
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  #6  
Old December 8th, 2003, 05:46 PM
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You'll have to post some of the actual log file messages if you want help.

What SMTP server are you running?
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  #7  
Old December 8th, 2003, 09:13 PM
johnmurray johnmurray is offline
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Here is the error in the /var/log/message. It's erroring out because the PIX is denying it. I need to figure out why smtpd and smtp is looking up the one deleted DNS entry. Feel free to ask for any other info because I'm really stuck at this point.

Dec 8 18:50:02 192.168.0.1 %PIX-3-106011: Deny inbound (No xlate) udp src inside:172.25.0.13/46205 dst inside:192.168.0.50/53

--john
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  #8  
Old December 9th, 2003, 04:29 AM
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What SMTP server are you running?

"smtpd" is a generic name for an SMTP daemon. All MTA's (qmail, postfix, sendmail) have an smtpd.
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Old December 9th, 2003, 12:05 PM
johnmurray johnmurray is offline
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sorry, I forgot to include that info.

I'm running PostFix.

--john
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  #10  
Old December 15th, 2003, 01:20 PM
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--> alexgreg... Any other ideas why it's still hitting the DNS server?

--john
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  #11  
Old May 25th, 2004, 06:26 PM
solomolo solomolo is offline
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This bit me in the *** for a couple days. Postfix has it's own resolv.conf. Try /var/spool/postfix/etc/resolv.conf.
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