[ale] Cable Modem Strangeness On The Road

Matt Smith msmith at risklabs.com
Fri Jun 11 12:04:56 EDT 2004


It's not at all uncommon for cable providers to lock down access to the
modem from a single MAC address.  That's why a lot of broadband routers
have a "MAC Clone" feature where you can either gather a MAC from the
current administrative connection, or type in whatever you like.

That doesn't totally explain the Knoppix situation, but it might.


--Matt


-----Original Message-----
From: hbbs at comcast.net [mailto:hbbs at comcast.net] 
Sent: Friday, June 11, 2004 12:01 PM
To: ale at ale.org
Subject: [ale] Cable Modem Strangeness On The Road


I'm at the in-laws' in Columbus, GA where Knology supplies the
broadband.  My nephew's WinXP box is wired straight to a 2com "sharkfin"
cable modem, and its Ethernet card is set up to use DHCP for obtaining
IP address and DNS address.  The weird thing is that if I boot to a
Knoppix CD, I get no connection, and my Linux laptop, which works just
fine with DHCP supplied locally in the house, also gets no connection.
Even if I set the IP address, gateway, mask, broadcast, etc. manually, I
get nothing - I can't even ping the cable modem using the gateway
address.  The only thing I can get is a link light on the sharkfin (but
I can't make it blink).  What's up with this?
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