一种基于NetFlow特定流记录的平均往返时延估计方法  

A METHOD OF ESTIMATING AVERAGE ROUND-TRIP LATENCY BASED ON SPECIFIC FLOW RECORDS IN NETFLOW

作　　者：张晓宇[1] 龚俭[2] 吴桦[1] 

机构地区：[1]东南大学计算机科学与工程学院,江苏南京210096 [2]江苏省计算机网络技术重点实验室,江苏南京210096

出　　处：《计算机应用与软件》2010年第5期64-66,92,共4页Computer Applications and Software

基　　金：国家科学支撑计划项目(2008BAH37B04)

摘　　要：时延对于网络管理有着重要的意义,测量时延主要采用主动测量和被动测量这两种方法。主动测量需要主动发送报文,而被动测量需要在测量点通过捕获在网络信道中传输的报文信息来实现。采用单点被动测量的方法,首次根据NetFlow中特定的TCP交互数据流记录,并结合统计中区间估计理论,估计出主机之间在某一时间段内的平均往返时延。通过实验表明,该方法可以基于现有的路由器提供的NetFlow数据来测量网络延迟,且具有较小的误差。Latency is significant to the network management.Generally,latency can be measured actively or passively.Active measurement needs to send packets actively,and the passive approach requests capturing packets transmitting in network link at one or more measurement points.In this paper,single-point passive measurement is employed to have estimated average round-trip latency between the hosts within a certain time segment based on some specific TCP interactive data flow records in NetFlow data the first time and combining interval estimation theory of the statistical process.Test results show that this method can use NetFlow data obtained from current COTS router to measure networks latency with acceptable error.

关 键 词：被动测量 NETFLOW 往返时延 

分 类 号：TP393.07[自动化与计算机技术—计算机应用技术]