- Tcl/Tk Tutorial
- The Network Simulator ns-2: Frequently Asked Questions
- IV. The first Tcl script
- Install NS2 (Network Simulator) on Ubuntu 18.04
- Basics of NS2 and Otcl/tcl script
Tcl/Tk TutorialSkip to content. Instantly share code, notes, and snippets. Code Revisions 2. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. This comment has been minimized. Sign in to view. Copy link Quote reply. Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Create a simulator object. Define different colors for data flows for NAM. Open the NAM trace file. Define a 'finish' procedure. Close the NAM trace file. Execute NAM on the trace file. Create four nodes. Create links between the nodes. Set Queue Size of link n2-n3 to Give node position for NAM. Monitor the queue for link n2-n3.
The Network Simulator ns-2: Frequently Asked Questions
Hi, I have created a ring topology having 5 nodes and I want to send my own message from one node to all other node. Please tell me how can I do it? I have stuck at this point. Alter communication all the slaves only master passes the content to other master nodes. Other network consists of mest network with four nodes. Once entire master complete the cycle means token rotation or data rotation completed in ring. Similarly do for two iteration. In this section, we are going to develop a Tcl script for ns which simulates a simple topology. You are going to learn how to set up nodes and links, how to send data from one node to another, how to monitor a queue and how to start nam from your simulation script to visualize your simulation. Now we are going to write a 'template' that you can use for all of the first Tcl scripts. You can write your Tcl scripts in any text editor like joe or emacs. I suggest that you call this first example 'example1. First of all, you need to create a simulator object. This is done with the command. Now we open a file for writing that is going to be used for the nam trace data. The first line opens the file 'out. In the second line we tell the simulator object that we created above to write all simulation data that is going to be relevant for nam into this file. The next step is to add a 'finish' procedure that closes the trace file and starts nam. You don't really have to understand all of the above code yet. It will get clearer to you once you see what the code does. The next line tells the simulator object to execute the 'finish' procedure after 5.
IV. The first Tcl script
Simulation is the process of learning by doing. Whenever there is something new in the world, we try to analyse it first by examining it and in the process get to learn a lot of things. This entire course is called as Simulation. Correlating to this process, in order to understand all the complexities one need to model the entire role-play in form of computer simulation, the need is to build artificial objects and assign them roles dynamically. Computer simulation is the designing of a theoretical physical system on a digital computer with emphasis on model designing, execution and analysis. After creation of the mathematical model the most important step is to create a computer program for updating the state and event variables through time by time slicing or event scheduling. If this simulation is carried out successively in parallel computers, it is called Parallel or Distributed simulation. It provides simulation for routing and multicast protocols for both wired and wireless networks. Install NS-2 using this command :. Nam is also needed to install. Nam Network Animator is an animation tool to graphically represent the network and packet traces. Use this command :. Explanation : In the first line, the variable a is assigned the value 8. Below is the implementation of creating links between the source and destination using both ftp and tcp :. Output :. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below. Writing code in comment? Please use ide. Create a simulator object. Define different colors. Define a 'finish' procedure. Close the NAM trace file. Execute NAM on the trace file. Create links between the nodes. Set Queue Size of link n2-n3 to Give node position for NAM. Monitor the queue for link n2-n3. Call the finish procedure after. Print CBR packet size and interval. Chinmoy Kalita. Check out this Author's contributed articles. Load Comments.
Install NS2 (Network Simulator) on Ubuntu 18.04
Post a Comment. Pages Home. This section shows a simple NS simulation script and explains what each line does. Example 3 is an OTcl script that creates the simple network configuration and runs the simulation scenario. To run this simulation, copy the below code and save as" ns-simple. This network consists of 4 nodes n0, n1, n2, n3 as shown in above figure. The duplex links between n0 and n2, and n1 and n2 have 2 Mbps of bandwidth and 10 ms of delay. The duplex link between n2 and n3 has 1. Each node uses a DropTail queue, of which the maximum size is A "tcp" agent is attached to n0, and a connection is established to a tcp "sink" agent attached to n3. As default, the maximum size of a packet that a "tcp" agent can generate is 1KByte. A tcp "sink" agent generates and sends ACK packets to the sender tcp agent and frees the received packets. A "udp" agent that is attached to n1 is connected to a "null" agent attached to n3. A "null" agent just frees the packets received. A "ftp" and a "cbr" traffic generator are attached to "tcp" and "udp" agents respectively, and the "cbr" is configured to generate 1 KByte packets at the rate of 1 Mbps. The "cbr" is set to start at 0. The following is the explanation of the script above. In general, an NS script starts with making a Simulator object instance. Most of member functions are for simulation setup referred to as plumbing functions in the Overview section and scheduling, however some of them are for the NAM display. This member function of "Simulator" object is for the NAM display, and has no effect on the actual simulation. In this function, post-simulation processes are specified. A node in NS is compound object made of address and port classifiers described in a later section. Users can create a node by separately creating an address and a port classifier objects and connecting them together. However, this member function of Simulator object makes the job easier. In NS, the output queue of a node is implemented as a part of a link, therefore users should specify the queue-type when creating links. In the above simulation script, DropTail queue is used. The NS implementation of a link is shown in a later section. Like a node, a link is a compound object, and users can create its sub-objects and connect them and the nodes.