It supports topology layout, packet level animation, and various data inspection tools. It has a graphical interface, which can provide information such as number of packets drops at each link. The network animator "NAM'' began in as a simple tool for animating packet trace data. Nam began at LBL. It has evolved substantially over the past few years. Currently, it is being developed as an open source project hosted at Sourceforge. This trace data is typically derived as output from a network simulator like ns or from real network measurements, e.
We can use NAM in network simulation by creating nam trace file and after that executing the nam trace file on TCL script. The second line tells the simulator to trace each packet on every link in the topology and for that we give file handler nf for the simulator ns. Then,execution of nam file is done by using following command.
It extends the basic Nam Editor with the following features: Integration with existing topology generators Localization and visualization of set of nodes on large network topologies according to different selection criteria; Instantiation of agents of any types on all the nodes of a given node set; Definition of new node types; Support for simulations of web cache systems.
The Extended Nam Editor work under Linux operating system; it is available for download in links given on the bottom of page. In order to simulate networks with realistic topologies, it is a common practice to use ad-hoc topology generators, whose output is usually not compatible with the ns2 syntax.
Hence, several tools have been developed to translate topology descriptions generated by topology generators in ns-scripts that can be used in the definition of a simulation scenario. Unfortunately, scripts produced in this way are not compatible with the Nam Editor, hence networks created by common topology generators cannot be modified interactively.
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