tcpdump is a common command line packet analyzer.It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached.tcpdump works on most UNIX like operating systems. USAGE: #tcpdump                               –Display standard tcpdump output #tcpdump -v ,-vv, -vvv           [...]

Let see how to install and configure mrtg with this article. Required packages mrtg-2.10.15-1.i386.rpm net-snmp net-snmp-utils Prerequisite: snmp should be configured and running Change the permissions of the directory #chmod 777 /var/www/mrtg Generate a configuration file #cfgmaker –output=/etc/mrtg/mrtg.cfg -ifref=ip –global “workdir: /var/www/mrtg” –global ‘options[_]: growright,bits’ user@192.168.0.10 Edit the configuration file and make the necessary changes. [...]

Nagios is a popular open source computer system and network monitoring software application. It watches hosts and services, alerting users when things go wrong and again when they get better. Installation includes the following steps Create user account for nagios #useradd nagiosnagios #passwd nagios Create  group named ‘nagioscmd’and add users naios and apache to this [...]