full-disclosure - Re: in-line coax monitoring device

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Message-ID: <94568D36597F074DBAF976CA2C6CCDCA10F9BB@EDM-GOA-EXCC-1A.goa.ds.gov.ab.ca>
Date: Mon Sep 26 20:19:32 2005
From: Mark.Senior at gov.ab.ca (Mark Senior)
Subject: Re: in-line coax monitoring device

> -----Original Message-----
> From: Dave Korn
> 
> ----Original Message----
> >From: Alex Krycek
> 
> >
> > ?????? ?????...looking for an in-line coax monitoring 
> device that will 
> > give me the ability to monitor/capture and decode all traffic that 
> > pass by - any suggestions on how to create one, purchase one, sites 
> > that sell them or tell you how to build one....? ???????
> > - -The Rat
> 
> 
>   The device you are looking for does exist.  It's called a 
> "cable modem".
> You can get them from ISPs.
> 

Except that you need a cable modem that's set up to put go into promiscuous mode, and not transmit anything.  I believe this may be doable with SNMP, but you would have to know the community strings used by the ISP.

The modems the ISPs ship only pass inward traffic destined for their own addresses.  I'm not sure if they announce their presence, if the computer behind them is silent - that might take some tweaking also.  What Alex described looked more like a passive tap, that won't emit any signals.  

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