I need a good network monitoring tool

I need to get some good network monitoring tools. I am trying to find out why my office network is so congested/slow, and I need something that will allow me to look at all the machines in the network and see who is being a piggy.

Solution 1:

Nagios

This is one of the most popular web based Linux monitoring systems nowadays, actually it’s industry standard for IT infrastructure monitoring. Licensed under GPL Nagios is available for everybody free of charge and allows to monitor availability and response time of network services, usage of system resources like CPU load, RAM allocation etc.,

Project’s homepage: http://www.nagios.org/

Cacti

Cacti is another web based monitoring system written in PHP and licensed under GPL. Unlike Nagios describe above Cacti was designed mainly fo the graphs

Project’s homepage: http://www.cacti.net/

Zabbix

Project’s homepage: http://www.zabbix.com/

MRTG

Project’s homepage: http://oss.oetiker.ch/mrtg/

Nfsen

Nfsen is open source Netflow collector and analyzer available under open source license. It differs from monitoring tools described here — Nfsen collects only network usage data and shows the interactive graphs based on that data.

Project’s homepage: http://nfsen.sourceforge.net/

Those are Web based network and system monitoring. If you want desktop applications i would recommend you to use etherape. You can install by:

sudo apt-get install etherape

Solution 2:

On a few ocassions I used EtherApe to locate a rogue file-sharing app hogging office network bandiwdth. It is availabe in the Software Center.

Whether it's going to help you depends on your network topology - in some (many?) cases your machine's NIC only sees packets going between your machine and the router.

Solution 3:

you can also use nethogs. you can install it by

sudo apt-get install nethogs

you can launch it by

sudo nethogs <connection_name>

for example

sudo nethogs ppp0

for example:

Solution 4:

SmokePing

SmokePing keeps track of your network latency:

• latency visualisation.
• Interactive graph explorer.
• Wide range of latency measurment plugins.
• Master/Slave System for distributed measurement.
• Highly configurable alerting system.
• Live Latency Charts with the most 'interesting' graphs.

Project’s homepage: https://oss.oetiker.ch/smokeping/index.en.html

Demo Site with live graphs

To install enter the command:

sudo apt-get install smokeping

See this page for some additional Perl module requirements.