Due to the nature of the TCP protocol, it is possible a number of flows are synchronising with each other. This means that flows influence each other in such a way that possibly one flow benefits from the synchronisation by claiming a large share of capacity, while other flow is not able to receive a reasonable portion of the capacity. This problem is most likely to occur in (simple) network simulations and possibly in actual networks with large data transfers. The synchronisation effect is caused by the relation between the round trip time (RTT) of packets of certain flows and the moment when a new slot comes available at a saturated DropTail queue (from which multiple flows make use of).
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