Re: Req: info on IP range popup ad software supposedly called "Extreme Marketing"

From: Barry Margolin (barmar@genuity.net)
Date: 12/31/02 

From: Barry Margolin <barmar@genuity.net>
Date: Tue, 31 Dec 2002 02:14:59 GMT

In article <zX6Q9.97526$Y86.28542@news2.central.cox.net>,
LXIX <post_replys_please@this.address.is.invalid> wrote:
>Yea. My bad, I parsed the question wrong. However, in terms of cable modems
>it still shouldn't work. Unless the modem knows your MAC and has assigned an IP
>it won't route packets out. Not sure about DSL though.

AFAIK, cable modems are Layer 2 devices. They don't care about the IP
addresses of the devices behind them, they just look at the MAC addresses.
So you probably can spoof IP addresses of other customers attached to the
same cable node.

>FWIW, the Linksys BEFSX41 will let me change the "outside" MAC address.

They provide that option because many cable modem ISPs require their
customers to register the PC's MAC address. When you insert the router in
the path, a popular option is to have it use the same MAC address as the PC
it's replacing, so that you don't have to call the ISP and register a new
address (which could be especially bothersome if you're troubleshooting and
have to keep taking the router out of the picture). 

-- 
Barry Margolin, barmar@genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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