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