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From Rich Bowen <>
Subject Re: [users@httpd]
Date Tue, 10 Nov 2009 16:55:05 GMT

On Nov 10, 2009, at 08:19 , Stephen Love wrote:

> I have set up a routine in my server that logs all incoming IP  
> addresses and parses for duplicates in the same list. HOWEVER...a  
> person posting almost NEVER has the same address. I believe I am not  
> using the actual IP Address at all. What I WANT is the actual SERIAL  
> NUMBER (If you could call it that!) of the HARDWARE (Network  
> Adapter) actually sending the message, or its REPLY TO address...  
> the address it is COMMUNICATING FROM in order to actually send the  
> message. I am SURE if it is to establish a 2-way link to send and  
> confirm  the message, the receiving end HAS that info, buried deep  
> within what it receives. HOW can I get that, so that the route steps  
> inbetween do not matter?

No, you can't. It's impossible. That information (the MAC address)  
doesn't make it past the first hop, and there's numerous pieces of  
hardware (routers, firewalls, proxy servers, etc) between client and  
server. The receiving end does NOT have that info, buried or  
otherwise. It's simply not there.

Rich Bowen

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