Ascend Archive
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Re: (ASCEND) Address Translation
this is what was on the list at the first of the month. I hope it
helps.-----------------------------
Dave McFerren davem@solve.net
System Administrator
Net Solutions, Inc.
816-220-0303 fax 816-220-0333
-----------------------------
"It never hurts to help!"
> Recent sendmail versions make a connection back to an incoming host's
> address on the auth port - 113. This is an old UNIX-based service - "is a
> user on your system trying to connect me to my port 25?"
>
> It's of not much use nowadays - large ISPs have ident turned off, because
> of the extra delay it causes - if the incoming host isn't running an auth.
> service on port 113, sendmail will try uselessly to connect for a little
> while before giving up.
>
> Firewalls have this problem, too - it's not specific to NAT.
>
Ahhhh... bloody identd... Never thought about the ramifications of 'no
answer' rather than a 'connection refused'.
The solution I just implemented was to map port 113 to an unused port on
the ethernet address of the PL130 -- this worked perfectly. The
connection is refused right away and sendmail gets on with it's life...
> From owner-ascend-users@max.bungi.com Thu Mar 26 02:29:48 1998
> X-Authentication-Warning: max.bungi.com: majordom set sender to
owner-ascend-users using -f
> X-Sender: boto@interpoint.net
> Date: Thu, 26 Mar 1998 02:26:49 -0500
> To: ascend-users@max.bungi.com
> From: Robert Drangel <boto@interpoint.net>
> Subject: (ASCEND) Address Translation
> Mime-Version: 1.0
>
> I am using NAT on a P75 with a dial up connection to an ISP. When I try to
> send mail via my ISP it takes over a minute to attach to the mail server
> and send the mail. This behavior goes away if I switch to an ISDN modem
> connection with a Motorola Bit Surfer Pro. In addition it only happens when
> sending mail not when receiving it. I even tried replacing the name of the
> SMTP server with its' IP address and still the same delay. Any ideas? I
> seem to think it's related to NAT since it goes away with the modem
> connection. Thanks in advance.
>
> Robert Drangel
> Senior Network Engineer
> CPT of South Florida
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