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Re: (ASCEND) Slow e-mail send when using NAT on P75

That static mapping on port 113 worked perfectly for me and a buddy of
mine.

--  John

---Lee Nelson <lwn@postalzone.com> wrote:
>
> On Mon, 10 Aug 1998, Rob Myers wrote:
> 
> > Both good suggestions, but as far as I know, Windows/Mac boxes
don't have
> > an auth/ident server monitoring port 113, so it would time out
anyway,
> > even if you were doing straight IP routing... 
> 
> However, if you are doing straight ip, then when sendmail tries to
reach
> port 113 on the Win/Mac machines, it will immediately get a connection
> refuesed on that port.  When you are doing NAT, then sendmail's
request to
> port 113 never reaches the machine to be refused.  Instead, the
packets
> just go into an ip black hole, so sendmail waits for the time out,
which
> takes longer than connection refused.
> 
> > 
> > The reason I say this is that we had many customers complaining
about slow
> > response times to send e-mail and when we turned this feature off in
> > Sendmail everything was back to its normal, speedy self.
> > 
> > If it were a reverse-lookup problem you would get some sort of
error from
> > the SMTP server about that, rather than a timeout.
> > 
> > -Rob-
> > 
> > > The mail server you're delivering the mail to is trying to
connect 
> > > to your auth/ident port at 113 (to no avail). After a while it
will 
> > > time out and accept the mail anyway.
> > > A simple solution is to create a static (NAT) mapping on your 
> > > pipeline that points to port 113 on the machine inside your LAN
that 
> > > is trying to send the mail.
> > 
> > [...]
> > 
> > > Make sure that the single IP you are using has a name
associatied with its
> > > reverse-lookup.
> > 
> > 
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> 
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