Greetings,
This is a known problem when running nat/pat and qmail. It involves the identd
packets that the server sends out on port 113. I noticed these originally when
my IProute box firewall complained about intrusion attempts on that port. After
4 of them, my mail went through. The easiest way to solve this is use a NAT
proxy or passthrough to pass port113 on to any internal machine. The mail server
will get a connection refused message from the box instead of a timeout. The
other solution is to disable identd lookups on the mail server.
--
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// Jere Cassidy - System Administration - D&E SuperNet
email: [EMAIL PROTECTED] phone: (717)738-7054
web: http://www.desupernet.net/jere
pager/pcs: [EMAIL PROTECTED] - (717)203-0042
~~~ "While sowing the seeds of Utopia,
you invoked a convenient amnesia" -BR ~~~
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Thomas Balle wrote:
> Hi,
>
> For some time I have experienced a problem which may be a qmail problem but
> Im not sure.
>
> I have a number of dial in customers who uses ISDN routers with pat/nat
> translation some of them have great difficulties sending and checking mail,
> it often takes in excess of 20 sec. to establish a connection to my qmail
> server regardless of the client program (I also tried to telnet directly to
> port 25 and 110 it takes the same time)
>
> Other customers with the same/very similar hardware config connects without
> a problem.
> I have not experienced the problem with customers who has direct access to
> the internet ie via a modem dialup.
>
> For all I can see the pat/nat works fine and they connect rapidly to all
> other servers on my network including af test server I have running sendmail.
>
> What could make the connect time so extremely slow ?
>
> Thanks,
>
> Thomas
