TCP is often blamed that it cannot use efficiently network paths with high Bandwidth-Delay Product (BDP). The BDP is of fundamental importance because it determines the required socket buffer size for maximum throughput. In this paper, we re-examine the BDP concept, considering the effects of network buffering and cross traffic on the `bandwidth' and `delay' characteristics of a path. We show that, with careful socket buffer sizing, a bulk TCP transfer can saturate a network path independent of ...