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[ns] Marc's tutorial example on ping agent



hello
I have just installed ns2 (ns-allinone-2.1b6) in redhat linux 6.0. I followed Marc's tutorial example on ping agent
but encountered following error message:-
invalid command name "Agent/Ping"
    while executing
"Agent/Ping instproc recv {from rtt} {
        $self instvar node_
        puts "node [$node_ id] received ping answer from \
              $from with round-trip-tim..."
    (file "ping.tcl" line 27)
I understand someone has posted this question in the ns user mailing list unfortunately there was no follow-up.
Please advise. Thanks in advance.
Cheers,
-- 
Abdul Aziz Bin Mustafa                          | Ph: +61 2 9385-4358
School of Computer Science & Engineering        | Fx: +61 2 9385-5995   
University of New  South Wales , Sydney         | Email: [email protected]
NSW 2052 Australia                              | Http://www.cse.unsw.edu.au/~amustafa