[vchkpw] Re: SMTP is too slow

[Sérgio Manuel Rosa]

When internal clients try to send mail sometimes they get timeout, I 
bellieve that in this case it's when client connect to server, other times 
if a mail got attachs it starts to send... at least it's what Outlook says, 
and it takes an eternity (a mail with 1Mg taking 3 hours to leave outbox 
:-/) to deliver the mail to the server. After the messages reaches the 
server it's dispatched in a question of seconds... 

I'm completly over this issue but can't find a reason for this to hapen. 

SRosa 

Paul Fletcher writes: 

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, Sérgio 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, Sérgio 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, Sérgio 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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Paul Theodoropoulos
http://www.anastrophe.com
http://folding.stanford.edu
The Nicest Misanthrope on the Net 








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