The following code illustrates the basic steps to configure an Exponential traffic source over a UDP agent, for traffic flowing from node s1 to node k1:
set src [new Agent/UDP] set sink [new Agent/UDP] $ns_ attach-agent $node_(s1) $src $ns_ attach-agent $node_(k1) $sink $ns_ connect $src $sink set e [new Application/Traffic/Exponential] $e attach-agent $src $e set packetSize_ 210 $e set burst_time_ 500ms $e set idle_time_ 500ms $e set rate_ 100k $ns_ at 0.0 "$e start"