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List: dshield
Subject: Re: [Dshield] little experiment
From: "Abuse" <abuse () what4now ! com>
Date: 2005-03-02 5:40:28
Message-ID: 20050302054029.01C437070B () smtp1 ! pacifier ! net
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** Reply to message from "Johannes B. Ullrich" <jullrich@euclidian.com> on Tue,
01 Mar 2005 17:42:54 -0500
> > How do you get the "behind firewall address"??
>
> its a little bit of javacode I found. Essentially, it tells your browser
> to reload the page, but adds the IP address of your system to the end
> (you will see 'IP=1.2.3.4' at the end of the URL).
Strange. I have JAVA enabled but my internal IP was not given, I am using
Mozilla v1.7.
> There are a couple of tricks to just display it locally with javascript.
> But so far, I have only seen java code that was able to actually send it
> to the server.
>
> As others have commented, many e-mail clients (e.g. mine) add it to the
> header, or mail servers add them if they are inside the natted network.
>
> If someone knows how to tell thunderbird not to send the IP as part of
> the 'helo', let me know ;-)
I don't know how Thunderbird works but here is what I did for my email client.
Polarbar gets the IP of the machine it is running on and does a DNS lookup, if
it does not resolve it uses the IP for the HELO. If it does resolve it uses
the resolved domain name for the HELO. I added my machines IP to the HOSTS
file and put the domain name I wanted to use externally there. Since this is a
laptop using DHCP at home I always get the same IP and when I travel, who knows
what IP comes up, I really don't care if the IP is used but if I did I could
change the HOSTS file.
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