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"