Tool: OpenNMS When it comes to Monitoring your net¬work and groups of devices on it, then one really good Open Source software that comes to mind is OpenNMS. It is a Linux based network resource monitor¬ing software that let's you track the per¬formance of a group of network devices and services on your network such as MySQL,Apache, FIP, SSH, etc.

It is capable of SNMP service polling, data collection, notification and event management. Deploying OpenNMS is not an easy job and can take a good amount of time. You can download a copy of the software from www.opennms.org.Itcan be installed on any system that supports Java and has Tomcat Application server pre-installed. While installing the solu¬tion you might get a lot of dependency errors. To avoid those, you can also opt for a ready made OpenNMS virtual ap¬pliance. It's available for VM ware can be deployed within minutes.



Once you've installed it or run the virtual appliance, you can access it from any machine on the network using a web browser. You simply have to type http://<ip-of-your¬machine>: 80801 opennms/. By default, the username and password are both 'admin'. As you login, you can see the dashboard of OpenNMS which shows you all servers connected to your net¬work and the services running on each. Before you type the URL,state the IP