摘要： Internet上的包延迟特性对于Internet的行为研究来说是最为复杂也是最为重要的一环。该文对Internet中的包延迟测量方法进行了深入研究，提出了自己开发的延迟测量工具Posip。Posip采用Poisson采样方法进行延迟测量，避免了普通周期性测量带来的负面效应。另外Posip还采用超时等待方式避免了 Ping工具中的“应答包丢失”现象。同时，对测量数据的处理，提出了测量数据有效性判定规则，并提出了一种延迟测量中线路误差的测量方法。使用上述方法在我国教育网和科研网上43条链路上进行了实际测量和验证，并取得了良好的效果。

关键词: 包延迟, 测量工具, 误差估算, 数据有效性

Abstract: Internet packet delay is the most complex and important element of network behavior. This paper first introduces a new delay measurement tool－Posip.Posip uses Poisson sampling method, which is much better than period sampling in network measurements, and uses "extra wait" to avoid ack-packet-loss phenomenon in ping measurements. In data analysis, the paper proposes a data verdict rules to judge data's validity. The paper also presents a method to estimate "wire error" in delay measurements. At last, experimental results on 43 paths in CERNET and CSTNET demonstrate the effectiveness of the tool and methods.

中图分类号: 

• TP393.06