Finding Round Trip Time in NS2

1. Create two ping agents and attach them to the nodes between   which the Round Trip Time is to be calculated.

              set p0 [new Agent/Ping]

             $ns attach-agent $n0 $p0

             set p1 [new Agent/Ping]

             $ns attach-agent $n2 $p1

             #Connect the two agents

             $ns connect $p0 $p1

2. When ping packet is received the recv{} procedure is called 

           Agent/Ping instproc recv {from rtt} {

           $self instvar node_

           puts "node [$node_ id] received ping answer from \

           $from with round-trip-time $rtt ms."

         }

     

     The member variable 'node_' of the base class 'Agent' is used to get the node id for the node to which the agent is attached and the variable rtt gives the Round Trip Time.