Networking things Was: RE: [Techtalk] DHCPD Question

Kath kath at
Fri Oct 12 05:07:40 EST 2001

That reminds me of something I've been pondering out... Linuxchix should do
a howto/help series... but really basic stuff.

I mean, next time I'm building out a server, which might be Sunday, who
knows, I would definitely think about writing everything I do for
installation and securifying (kernel rebuild, removing services), step by

It would probably be for a file server of some sort or a VPN device on
Debian, I'm not sure :)

Also a definitions of things, like how myself and Raven did.  Maybe even do
pretty pictures (In Visio or something else of that nature), that always
helps.  I could do it for IP addresses, network devices (already done),

Or if I could find hosting (I see places doing it with PHP/MySQL for like
$15 now. I'd so do that), I'd do it myself on with the domain I am trying to
register with NSI (Their https server isn't responding),
( is so last year!  Plus I don't talk to that individual who
nicked me that, so the joke is a moot point now)

- James

-----Original Message-----
From: techtalk-admin at
[mailto:techtalk-admin at]On Behalf Of Almut Behrens
Sent: Friday, October 12, 2001 2:38 AM
To: techtalk at
Subject: Re: Networking things Was: RE: [Techtalk] DHCPD Question

Wow -- deeply impressed by those nice descriptions from Kath and
Raven! If I were in the position (and appropriate location of the
world), I'd immediately hire you, Kath, to make your dreamjob come
true... :)

On Thu, Oct 11, 2001 at 07:51:47PM -0400, Kath wrote:
> <snip>
> On every network card there is a MAC address, which uniquely identifies
> computer.  The switch will do a broadcast and poll the devices on each
> for a list of MAC addresses of connected devices.

...not much left to add, and the networking cracks here certainly
already know:  it's this broadcasting technique of switches where
ARP spoofing can get its handle on (though some switches allow to
take precautions against it). For a short intro see

For those who want to play around with this (in their home LAN only,
of course!), there's the 'dsniff' collection of tools, which also
allows for interesting uses like network monitoring:

(also remotely related to the recent MRTG thread)


- Almut

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