Nagios is the new name for NetSaint, a network/service monitoring tool. It was designed for Linux, but can be compiled and run perfectly well under any UNIX variant as far as I am aware. The monitoring daemon runs intermittent checks on hosts and services you specify.Nagios can send report through …

 Cacti uses RRDTool to generate graphs for network statistics like bandwidthd. 
 
Requirements:

Mysql
Php
Rrdtool
net-snmp
net-snmp-devel.i386
net-snmp-libs.i386
net-snmp-perl.i386
net-snmp-utils.i386
php-snmp
Apache with PHP Support
 
MySQL configuration for cacti:
 
mysql -u root -p
mysql> create database cacti;
mysql> grant all on cacti.* to cactiuser@’localhost’ identified by ‘cactipassword’;
mysql> flush privileges;
 
RRDTool Installation
 
Requirements:

tcl
tcl-devel
 
[root]# cd /usr/local/src/
[root]# wget http://oss.oetiker.ch/rrdtool/pub/rrdtool.tar.gz
[root]# tar -zxf rrdtool.tar.gz
[root]# cd rrdtool*
[root]# ./configure
[root]# make
[root]# make install
[root]# make site-perl-install
 
   …