TELECOM Digest OnLine - Sorted: Re: Cell Phone Jammer For Sale MONIX MGB-1S

Re: Cell Phone Jammer For Sale MONIX MGB-1S

Robert Bonomi (bonomi@host122.r-bonomi.com)
Tue, 29 Mar 2005 14:02:30 -0000

In article <telecom24.134.7@telecom-digest.org>, TELECOM Digest
Editor noted:

> [TELECOM Digest Editor's Note: Other than the fact that she apparently
> was not able to hook herself up to the network, I wonder how the
> school would know what was or wasn't there. In other words, if she now
> were to open the computer and install the original card in there
> instead, how would the school ever find out, or do they search dorm
> rooms looking for contraband hardware, etc? PAT]

Ignorance in action. Specific ranges of Ethernet addresses are
assigned to given manufacturers. Which manufacturer "owns" which
range is _public_data_.

Any device residing on the same LAN segment that can "see" Ethernet
packets from a given machine can tell which brand of NIC is in that
box.

All Ethernet cards on a LAN are required to have a _unique_ Ethernet
address. So, manufacturers "build in" the uniqueness.

On some systems, with some cards, you can over-ride the built-in
Ethernet address, and tell it to use an Ethernet address you specify.
This is not an option under MS-Windows.

A _lot_ of schools require you to 'register' your computer (actually
the NIC) with the institution before you can use it on the school
network. And even then it will work *only* from your dorm room. The
network infrastructure is built around 'secure' switches, and only
accepts packets from a "known" Ethernet address on any given port.

This does wonders for being able to track down the perpetrator when,
for example, one student tries hacking other student machines.

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