[ns] Rookie question

[ihab sayed]

Hello

In my trace files I get these 2 lines:

D 136.605559838 _6_ IFQ  ARP 2 DSR 76 [0 0 6 800] ------- [6:255 0:255 254 
14] 6 [0 1] [1 1 6 0->6] [0 0 0 0->0]
D 180.025101824 _4_ IFQ  ARP 910 cbr 556 [13a 4 4 800] ------- [0:0 6:0 29 
14] [20] 3 0

They mean that packets have been dropped! But can you tell me what is the 
reason for them being dropped, and what is IFQ? does that mean that packets 
r dropped due to the Interface Queue???!!

I would appreciate if someone explained these lines for me. THANKS

Ihab Sayed