Snort mailing list archives

Re: Capture Email Content / Website Activity


From: stuff () trackingsolutions ca
Date: Sun, 27 Nov 2005 15:26:00 -0700

Is there then a way to create a snort box the sits between the router and the 
modem?

On November 27, 2005 02:40 pm, barryab63-ia () yahoo com wrote:
If your using a Linksys router and have your snort box plugged into on of
its switch port, then I doudt your seeing all the http activity or email. 
You'r only seeing activity going to/from the snort box and any broadcast
traffic.  I don't think you can set the Linksys router/switch up for a
monitor port.

  Sound like you'll need to get a switch that has the ability to have a
monitor/mirror port, not all switches have this ability.  You'll need a
switch with management functions and then double check the specs to make
sure it has the monitor/mirror port function.

  Barry


stuff () trackingsolutions ca wrote:
  There are several challenges here.

I am developing a solution for a client to allow them to determine if their
network is clean for inappropriate activity. They are running a Linksys
router with built in switch. I suspect that this will limit the abilities
to capture all the data. When I run "snort -dv" I am able to see all http
activity but not outgoing emails from other machines. I can see the email
was sent but that was it.

Do I need to get a new switch to accomplish this job?

Thanks

On November 27, 2005 03:39 am, barryab63-ia () yahoo com wrote:
In order to see everything on the network, you need to have one of the
following:

1. A true hub. But, you'll only see traffic that passes through the
hub. 2. A switch that will let you configure a monitor port, have the
port your snort box is connected to configured to monitor all the other
ports. How you do this depends on the switch. 3. Use a network tap. Place
the tap were it will pickup the traffic you want to see, possibly between
your firewall and inside router/switch, that way you would see everything
in and out of your network. 4. Run snort in in-line mode, place the snort
box in a location similar to the network tap.

You would really need to give more information on your network to get a
more detailed answer.

As to detecting web activity, snort does have some rules for detect web
traffic. But, it sound from you question that it might be better to try
to get this info from you Firewall logs. Snort isn't really a very good
web usage monitoring tool.

Barry



stuff () trackingsolutions ca wrote:
I am new to snort and am starting to test things out. I am able to
capture email content from the machine running snort, but I would also
like to capture email being sent on the entire network. Is there a way to
do this?

Also is there a way to capture visited websites for the entire network to
a file stating date, time, url, ipaddress?

Thank you very much.


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