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[ns] how to access node at link?



hi, everyone.
I've got serious problem.
here is my topology.
 
[n1]----------
[n2]----------[n4]-----(*)------[n5]
[n3]----------
 
sender is n1, n2, n3
rcver is n5
(*) is queue at duplex-link.
 
I have to generate some packet at (*).
so I like to know how to access n4 at (*).
please help me!!!
thanks in advance.
Jini.