Re: Firewalling?

From: Jose Maria Lopez Hernandez (
Date: 08/24/04

Date: Tue, 24 Aug 2004 05:00:29 +0200

Richard Cavell wrote:
> Hi,
> I'm using a Debian installation. I prefer to use the command line. I'm
> trying to log into one machine using ssh on another. The problem is
> that the appropriate port is closed. How do I 'open' it?

If you have administrative access to the machine where the port is
closed then you just have to change the rule that it's not letting
you log into the machine. If you don't have it then it's impossible
to open the port without using hacking techniques, and I'm not talking
about script kiddies techniques...

> What would be a good piece of software to update graphically in KDE in
> realtime when ports are being accessed?

You can take a look at ntop, it has a nice web interface.
Or you can use a konsole with lsof -i -r 1, it's what I use
when I want to have a look at the connections in an easy way.

Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
bgSEC Seguridad y Consultoria de Sistemas Informaticos
The only people for me are the mad ones -- the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn, burn
like fabulous yellow Roman candles.
                 -- Jack Kerouac, "On the Road"