Install ntop on Red Hat Enterprise Linux / CentOS Linux

Download latest ntop

Visit ntop project to grab latest version. You can use wget to grab the same enter:
# cd /opt
# wget http://freshmeat.net/redir/ntop/7279/url_tgz/ntop-3.3.6.tar.gz

Untar tar ball enter:
# tar -zxvf ntop-3.3.6.tar.gz

Configure and Compile ntop under RHEL

You must have RRDTool installed. You also need to install libpcap enter:
# yum install libpcap-devel libpcap
Type the following commands to compile and install ntop:
# cd ntop
# ./autogen.sh

Just type make to compile ntop:
# make
Just type make install to install ntop:
# make install
# make install-data-as

Create ntop user

Type the following command to run ntop as ntop user enter:
# useradd -M -s /sbin/nologin -r ntop

Setup directory permissions

Next you need to setup directory permissions enter:
# chown ntop:root /usr/local/var/ntop/
# chown ntop:ntop /usr/local/share/ntop/

Setup ntop user admin password

Type the following command to set ntop admin password enter:
# ntop -A
Sample output:

Mon Jul 28 03:38:34 2008  NOTE: Interface merge enabled by default
Mon Jul 28 03:38:34 2008 Initializing gdbm databases

ntop startup - waiting for user response!

Please enter the password for the admin user:
Please enter the password again:
Mon Jul 28 03:38:42 2008 Admin user password has been set

Start ntop

Type the following command to start ntop:
# /usr/local/bin/ntop -d -L -u ntop -P /usr/local/var/ntop --skip-version-check --use-syslog=daemon
Sample output:

Mon Jul 28 03:42:19 2008  NOTE: Interface merge enabled by default
Mon Jul 28 03:42:19 2008 Initializing gdbm databases

If you have multiple interface (eth0 eth1 and so on) start ntop as follows:
# /usr/local/bin/ntop -i "eth0 eth1" -d -L -u ntop -P /usr/local/var/ntop --skip-version-check --use-syslog=daemon
Where

  • -i "eth0 eth1" : Specifies the network interface or interfaces to be used by ntop for network monitoring. Here you are monitoring eth0 and eth1.
  • -d : Run ntop as a daemon.
  • -L : Send all log messages to the system log (/var/log/messages) instead of screen.
  • -u ntop : Start ntop as ntop user
  • -P /usr/local/var/ntop : Specify where ntop stores database files. You may need to backup database as part of your disaster recovery program.
  • --skip-version-check : By default ntop accesses a remote file to periodically check if the most current version is running. This option disables that check.
  • --use-syslog=daemon : Use syslog daemon.

How do I view ntop stats?

By default ntop listen on 3000 port. You can view ntop stats by visiting following url:
http://localhost:3000/
OR
http://server-ip:3000/

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