Ntop

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Revision as of 22:32, 12 April 2012 by Prometheus (Talk | contribs) (Added the SSL "section" below ntop's web interface on the last edit (forgot the summary) and now I added a default config proposal for users to orientate on), plus a description how to add easily a user without a shell to run ntop properly.)

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Introduction

Ntop is a network traffic probe based on libcap, that offers RMON-like network traffic statistics accessible via a web browser. See ntop.org for an overview.

Installation & Configuration

  • Ntop is available in the Extra repository:
# pacman -S ntop
  • During the first run of ntop, you must set the admin password:
# ntop
  • Next, you need to edit your /etc/conf.d/ntop to adapt on your needs. Below is an example configuration, with the focus on the host to get as much as information from the hosts connections:
/etc/conf.d/ntop
# Parameters to be passed to ntop.
NTOP_ARGS="-K -W 2323 -i eth0,wlan0 -M -s -4 -6 -s -u ntop -c -r 30 -w3c -t 3 -a /var/log/ntop/http.log -O /var/log/ntop/ -q --skip-version-check 0"

# Location of the log file.
NTOP_LOG="/var/log/ntop/ntop.log"
  • Next, start the ntop service:
# /etc/rc.d/ntop start
  • Also, if preferred, add ntop to DAEMONS list in /etc/rc.conf to start process automatically at boot.
  • The configuration file is located at /etc/conf.d/ntop

Tips & Tricks

ntop's web interface

To access ntop's web interface, enter http://127.0.0.1:3000/ into your web browser. To make changes to the server, you will need to enter your username (default = admin) and password.

If ntop is not just used locally on your machine, but network wide by multiple users, you'd be better off by allowing SSL connections (https) only.

# [...] = other parameters given
# ntop -w 4223 [...]

You can also provide ntop with your own SSL certificate. Simply put it in ntop's config directory and name it ntop-cert.pem

# cd /etc/ntop/
# openssl req -x509 -nodes -days 365 
  \-subj '/C=US/L=Portland/CN=swim' 
  \-newkey rsa:1024 -keyout ntop-cert.pem -out ntop-cert.pem

ntop's group & user

In order that the -u parameter is able to work properly and to secure your ntop setup a bit more, you should create an own group and user for it.

# useradd -M -s /sbin/nologin ntop
# passwd -l ntop
Note: The passwd command here is optional, but recommended, as it will render the system more secure regarding your sshd.

Troubleshooting

**ERROR** RRD: Disabled - unable to create base directory (err 13, /var/lib/ntop/rrd)

Directory may not exist. Create it and make sure it belongs to user nobody

Please enable make sure that the ntop html/ directory is properly installed

If you receive this warning while trying to access the web interface, edit /etc/conf.d/ntop to include your IP and restart the daemon. For example:

NTOP_ARGS="-i eth0 -w 127.0.0.1:3000"

This is the IP you will use to access the web interface.