By default, ntop only has a single predefined administrative user account, with the username of admin and the password of admin. However, ntop also has its own separate user accounts and access controls, which are independent of the GroundWork Monitor controls. As such, users who have been granted the appropriate role-based permission to access the ntop object can do so by logging into GroundWork Monitor, and then choosing the "Protocol Analyzer" entry from the main drop-down menu. The ntop web pages are provided by a standalone application, although the ntop web front-end is also integrated into GroundWork Monitor through the use of the JBoss Portal. The GroundWork NMS ntop package has its own unique configuration process. This document discusses the basic configuration and operation of ntop. However, ntop is also useful for monitoring peculiar traffic at specific devices, such as determining if a particular node is infected with a network worm, running a prohibited file-sharing program, or engaging in some other kind of undesirable activity. Ntop is primarily useful as a tool for assisting network administrators with network monitoring and management tasks such as viewing the distribution of application traffic across a network, or determining which nodes are responsible for the most traffic. From there, administrators can use the ntop web interface to display charts and tables that show the activity across the overall network, and can also drill-down to examine information associated with a particular network node. More specifically, ntop uses a variety of technologies to capture traffic from one or more network segments, analyzes the traffic for key attributes and markers, and then stores a summarized form of the data in a set of dynamic databases.
Whereas most of the components in GroundWork Monitor are designed for the purpose of monitoring the devices on a network (such as measuring the available resources on a host and then generating alarms when conditions require it), ntop is designed to help administrators monitor the traffic on a network (such as measuring the amount of HTTP versus SMTP traffic, or viewing which nodes are generating the most traffic). In simple terms, ntop is an integrated toolkit for monitoring the activity on a network.
The ntop package is an open source toolkit for monitoring network traffic and is integrated into the GroundWork Network Management System (NMS. 4.0 Integrating Ntop Data with GroundWork Monitor.
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