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[ns] packet drop - CBK?



Hello,

I'm analyzing a trace file, and find that some packets
are dropped due to 'CBK'. Can someone please tell me
why these packets are dropped? I'm using ns-2.18a,
running UDP/CBR between 2 wireless node.

Thank you.
Susan 


D 1.251250000 _0_ RTR  CBK 135 cbr 230 [0 0 0 800] ------- [0:0 1:0 32
1] [66] 0 0
D 1.251250000 _0_ RTR  CBK 137 cbr 230 [0 0 0 800] ------- [0:0 1:0 32
1] [67] 0 0
s 1.251250000 _2_ AGT  --- 138 cbr 210 [0 0 0 0] ------- [2:0 3:0 32 0]
[67] 0 0 
r 1.251250000 _2_ RTR  --- 138 cbr 210 [0 0 0 0] ------- [2:0 3:0 32 0]
[67] 0 0