Error model help!

[jamester <jamester@dacl3.snu.ac.kr>]

I am trying to use multistate error model in ns version 2.1b4.  However I am
having a bit of trouble.  Packets are not dropped.  I hope you could help me on
this matter.

set tmp [new ErrorModel/Uniform .04 pkt]
set tmp1 [new ErrorModel/Uniform .4 pkt]

set m_states [list $tmp $tmp1]
set m_transmx { {0.95 0.05 } {0.7 0.3} }

set m_trunit pkt
set m_nstates 2

set m_nstart [lindex $m_states 0]
set em [new ErrorModel/MultiState $m_states $m_transmx $m_trunit $m_nstates $m_nstart]

 $ns lossmodel $em $node(1) $node(2)

There is a duplex link between node 1 and 2.
I think everything is set and packets should drop.  But no packet seems to be
dropping.  Any help on this matter would be greatly appreciated.
Thanks

-James Kwon