Hi all friends I send a packet from node 0 to node 5 and cache in the middle nodes and send ack after time from node 5 to 0 but ack packet drops in middel node. in trace file shows this sentence:
D 0.369646834 _4_ RTR CBK 2 tcp 8 [13a 3 4 800] ------- [0:0 0:0 -2 3] [0 0] 1 0
