===== Maintainer =====
ClearFoundation

===== Description =====
The [[http://www.ntop.org|web-based ntop software]] provides detailed network usage and monitoring reports for your ClearOS system.  Ntop does require some horsepower to monitor your network, so be cautious when installing it on lightweight systems.

===== Installation =====
To install ntop on your ClearOS system, run:

  yum --enablerepo=base-extras install ntop

Next, you need to set a password for the ntop web-based administration interface:

  ntop -A

To start ntop, run:

  service ntop start

To start ntop on every boot, run:

  chkconfig ntop on

===== Use =====
You can access ntop via your favorite web browser.  The web-based administration interface runs on port 3000, so the web address will look something like http://192.168.1.1:3000

By default, the ntop reports are accessible by anyone on your local network.  If you would like to limit access to only the administrator,

  * Go to //**Admin > Configure > Protect URLs**// in the menu.
  * Enter your login information: **admin** is your username and the password is what was set during installation.
  * Click on //**Add URL**// near the bottom of the web page
  * Leave the URL field blank (which means //all//) and click on the //**Add URL**// button.

Useful options

  * Admin -> Configure -> Startup Options: Sticky hosts. Beware additional resource usage.
  * Admin -> Configure -> Startup Options: Local Subnet Address (i.e 192.168.1.0/24)
  * Admin -> Switch NIC. ntop will only display information from the selected NIC, unless merge mode is active.

See http://spblinux.de/2.0/doc/ntop.html for more information

===== Screenshot =====
{{:apps:ntop1.png|Ntop report showing details by IP address}}