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From Gund Wehsling <>
Subject RE: [users@httpd] Fwd: Home Web Server
Date Fri, 15 May 2009 02:52:19 GMT
Just a consideration....

As far as I know, ADSL uses PPPoA This is how the ISP
can have you authenticate before giving you an IP address and consequently, you can be denied
access before a 'connection' can be made.

Of course, the 'connection' is IP, which then runs over the ATM, as the name implies, Point
to Point Protocol OVER ATM.

This may not be the case in all installation all over the world, but is the case here in NZ.
MAC addresses, being unique by RFC definition are the underlying magic in IP networks, but
ATM magic happens at Layer 1 (connection), so no MAC address required and consequently, your
ISP can identify you and have you authenticate before shelling out an IP address. I am not
100% certain, having not worked with ATM before, but I assume the only way to uniquely identify
any ATM packet is by the switch port, which explains why a techie has to connect your new
ADSL before it will work (as opposed to dial up that works from anywhere) and each provider
requires access to the street cabinet. You can test this by taking your ADSL modem from one
ISP to a friends house who belongs to another ISP. It does not work, hence the connection
layer is the controlling authority.

The articles on Wikipedia are well written and easy to understand with good links.

I hope this helps.


From: Evan Platt []
Sent: Friday, 15 May 2009 14:34
Subject: Re: [users@httpd] Fwd: Home Web Server

At 07:05 PM 5/14/2009, you wrote:

>Shirley, you jest... how else could an equipment identify itself
>when turned on... I pressed COX CABLE after PURCASING DYNAMIC
>BUSINESS CABLE connection, only to find that they identified your
>EQUIPMENT before assigning a DYNAMIC IP from the pool... but already
>HAD a PERMANENT EQUIPMENT IP. They gave me that one, and for the
>past year I have enjoyed STATIC IP of
>Try it!

It's called a MAC address.

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