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Date:      Sun, 5 Nov 2000 18:29:51 +0100 (CET)
From:      "Patrick M. Hausen" <hausen@punkt.de>
To:        brucegb@realtime.net (Bruce Burden)
Cc:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Problem with firewall, any ideas?
Message-ID:  <200011051729.SAA59310@hugo10.ka.punkt.de>
In-Reply-To: <20001104232720.B45237@tigerfish2.my.domain> from Bruce Burden at "Nov 4, 2000 11:27:20 pm"

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Hello!

> 	Anybody want to hazard why I can't rlogin/telnet to any sites?
>    About the only clue I have is that I get ACK packets from machines/
>    sites I can connect to, none from machines/sites that time out.

Slightly OT on -stable, I'd guess, but here it goes ...

This looks like the typical "broken reverse mapping" problem to me.
The sites, you can't connect to time out in DNS trying to figure out
the hostname asociated with your IP address.

Try connecting to one of the sites that don't work once more and
just wait. Really _wait_, i.e. quite a few minutes. If you get
a connection eventually, it's reverse lookups.

The machines you can connect to either don't care or - like one of our
customers once - are within the same administrative domain and do
get correct reverse lookups while the reverse delegation for that
particular network was broken for the rest of the internet.

Anyway, without further information this is just an - though educated -
guess.

HTH,
Patrick
-- 
--- WEB ISS GmbH - Scheffelstr. 17a - 76135 Karlsruhe - 0721/9109-0 ---
------ Patrick M. Hausen - Technical Director - hausen@punkt.de -------
"Contrary to popular belief, penguins are not the salvation of modern
 technology.  Neither do they throw parties for the urban proletariat."


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