Well with thopse tcpserver flags so far as I can see there should be no DNS
lookups going on at all, so I don't think you can blame the DNS server...
Someone will correct me if I'm wrong.

I have had this problem when not using -H and/or not using -R on a very
busy server where there is NAT between the mail server and the DNS server;
if you have UDP packets being natted for DNS lookups and there are lots of
them it can eat up all the nat table entries, and then you can't get
connected until entries get aged out.

Is it slow to actually connect, or slow to respond once you are connected?

At 17:24 09/07/03 +0000, SÚrgio Manuel Rosa wrote:
>Antonio,
>
>My qmail-smtp/run goes like this:
>
>#!/bin/sh
>QMAILDUID=`id -u qmaild`
>NOFILESGID=`id -g qmaild`
>exec /usr/local/bin/tcpserver -c 50 -D -H -R -v -P -l 0 -x 
>/home/vpopmail/vmail/etc/tcp.smtp.cdb \
>     -u $QMAILDUID -g $NOFILESGID 10.0.0.200 smtp 
>/var/qmail/bin/qmail-smtpd 2>&1
>
>Paul,
>no error of any kind of info in logs.
>
>List,
>I allready changed the connection on the switch, I had a VLAN where 
>connected the eth of the mail server to the internal network hub, to the 
>eth connected directly to the hub. Did'nt solve, so it's not a hardware 
>problem.
>
>Paul Theodoropoulos wrote:
>
>>
>> do your qmail logs provide any diagnostic info?
>>
>> At 09:26 AM 7/9/2003, SÚrgio Manuel Rosa wrote:
>>
>>> Hi,
>>> tcpserver (last release)
>>> NAT only at the FW, routing to the inside net. Kinda like this
>>>
>>> WWW---FW with PublicIP--NAT--SMTP---routing---Internal Network
>>>
>>> Regards,
>>> SRosa
>>>
>>> Paul Fletcher wrote:
>>>
>>>> Are you using inetd or tcpserver?  And is there any NAT between the 
>>>> smtp
>>>> server and its dns resolver?
>>>>
>>>> At 17:44 09/07/03 -0300, Nasib Salim wrote:
>>>>
>>>>
>>>>> Hi Sergio
>>>>> I dont have a DMZ and  I have only public DNS.
>>>>> I have problems in both internal net and outside world.
>>>>>
>>>>> Nasib On Wed 09 Jul 03 12:33, SÚrgio Manuel Rosa wrote:
>>>>>
>>>>>
>>>>>>  Hi Nasib,
>>>>>>
>>>>>> a personal question because I'm having kinda same problem.
>>>>>> Do you have a DMZ?
>>>>>> Do you have internal dns and public dns?
>>>>>>
>>>>>> I have a problem like yours but only from my internal net. Clients 
>>>>>> from
>>>>>> the "outer world" dont have any problem, inside hosts have timeouts.
>>>>>>
>>>>>> Regards,
>>>>>> SRosa
>>>>>>
>>>>>> Nasib Salim wrote:
>>>>>>
>>>>>>
>>>>>>> Dear all,
>>>>>>>
>>>>>>>  I'm running Qmail with vpopmail and qmail-scanner. For the past 
>>>>>>> 2 years
>>>>>>> there were no problem but recently the problem starts.
>>>>>>>
>>>>>>> SMTP Server is too slow to respond. it takes more than a minute 
>>>>>>> for it
>>>>>>> to response.  My DNS is working fine and there is no problem even
>>>>>>> resolving the mail server. I know the DNS is the source is this 
>>>>>>> problem
>>>>>>> but seems its not.
>>>>>>>
>>>>>>> Please help!
>>>>>>>
>>>>>>> Nasib A Salim
>>>>>>> Mediapost (T) Ltd
>>>>>>>
>>>>>
________________________________________________________________________ 
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>>>> ________________________________________________________________________ 
>>>>
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>>>
>>>
>>>
>>>
>>
>> Paul Theodoropoulos
>> http://www.anastrophe.com
>> http://folding.stanford.edu
>> The Nicest Misanthrope on the Net
>>
>>
>>
>>
>
>
>
>
>
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>This email has been scanned for all viruses by the MessageLabs Email
>Security System. For more information on a proactive email security
>service working around the clock, around the globe, visit
>http://www.messagelabs.com
>________________________________________________________________________
>
>________________________________________________________________________
>This email has been scanned for all viruses by the MessageLabs Email
>Security System. For more information on a proactive email security
>service working around the clock, around the globe, visit
>http://www.messagelabs.com
>________________________________________________________________________
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>

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