14 April 2014

cbrgen and setdest in NS2 (Network Simulator 2)

This post will help you to understand the automatic TCL code generation for creating connections between the nodes, to create hops, generates tcp or cbr agents, etc.

There are two things are used: setdest and cbrgen.tcl

setdest is used to

  • Create hops between the nodes using the GOD (General Operations Director) object.
  • Create mobility for nodes in terms of metres/second
  • Move from one place to another place using setdest (Set destination) with speed
  • To execute, use ./setdest
Example of Setdest is

$] cd /home/pradeepkumar/ns-allinone-2.35/ns-2.35/indep-utils/cmu-scen-gen/setdest

$] ./setdest -v 2 -n 10 -s 1 -m 10 -M 50 -t 30 -P 1 -p 1 -x 500 -y 500 > usersetdest.tcl

The above output is redirected to usersetdest.tcl 

cbrgen.tcl 
  • create connections between the nodes , one can specify the maximum number of connections to be made for all the nodes in the network
  • to create the type of agents between the nodes (cbr or tcp)
  • rate at which the packets are transmitted.
  • to execute this, ns cbrgen.tcl

Example of cbrgen.tcl is
$] /home/pradeepkumar/ns-allinone-2.35/ns-2.35/indep-utils/cmu-scen-gen
$] ns cbrgen.tcl -type cbr -nn 10 -seed 1 -mc 5 -rate 5.0 > cbr-10-test.tcl
See the image below to use these two scripts

If you want the step by step instruction, refer this video


T S Pradeep Kumar