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[ns] Network Congestion in TCP



Hello!
I've a problem...
I've this network topology,where there are two Tcp Vegas senders with two ftp application (n0 n1) two routers(n2 n3) and  two tcpsink (n4 n5)
 
 
$ns duplex-link $n0 $n2 10Mb 2ms DropTail
$ns duplex-link-op $n0 $n2 orient right-down
 
$ns duplex-link $n1 $n2 10Mb 2ms DropTail
$ns duplex-link-op $n1 $n2 orient right-up
 
$ns duplex-link $n2 $n3 100KB 2ms $tipo_di_coda
$ns duplex-link-op $n2 $n3 orient right
 
$ns duplex-link $n3 $n4 10Mb 2ms DropTail
$ns duplex-link-op $n3 $n4 orient right-up
 
$ns duplex-link $n3 $n5 10Mb 2ms DropTail
$ns duplex-link-op $n3 $n5 orient right-down
 
..my problem is that I try to make the network congestioned with dropped packets at the router n2 but I'm not able to do it!!! 
 
Thank you for your help.