erm.....where to start!

first, read this:

http://www.flowcalcs.com/computer101/Packet_Sniffers.htm 

Then go to Cisco and look up "SPAN".

Chris 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
Lorenzo Fife
Sent: Wednesday, March 09, 2005 12:52 PM
To: [EMAIL PROTECTED]
Subject: [Ntop] NTOP misc. questions

Hi, i just installed NTOP on a debian machine (i'm learning Debian) and
it seems GREAT.  seems amazingly powerful, and i love it so far.

however i'm curious about a few things.  first, i've got the linux box
running NTOP plugged into a catalyst 4507r switch, and the other
hundreds of ports the switch has are all going to other hosts on the
network.  how is NTOP able to acquire information such as traffic and
bandwidth of other hosts, if it's just a host itself?  i mean, only the
switch has that information, doesn't it?  since only the switch has all
traffic going through it to the outside world.

so does my NTOP linux machine analyze EVERY packet moving on the
network?  
how do i know if it's accurate, you know?

Thanks


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