软件
軟件
연건
SOFT WARE
2015年
1期
47-50
,共4页
计算机网络%网络性能测量%单向网络时延%NAT%被动测量
計算機網絡%網絡性能測量%單嚮網絡時延%NAT%被動測量
계산궤망락%망락성능측량%단향망락시연%NAT%피동측량
Computer Networks%Network Performance%One Way Delay%NAT%Passive Measurement
NAT协议会修改IP协议和TCP协议的协议头,从而无法有效的检查发送的数据包和接收到的数据包的一致性,导致被动测量单向网络性能指标失效。本论文通过对被动抓取的数据包的 IP 和 TCP 协议头进行修改,再对整个数据包计算摘要的,来确定发送数据包和接收数据包的对应关系。同时修改了单向时延的计算方法,加入了类似滑动窗口的技术,能够支持大规模的抓包数据的单向时延计算。用该方法对网络单向时延设计了测量方案,对实际网络进行了长时间的测量,证明了该方法的有效性。
NAT協議會脩改IP協議和TCP協議的協議頭,從而無法有效的檢查髮送的數據包和接收到的數據包的一緻性,導緻被動測量單嚮網絡性能指標失效。本論文通過對被動抓取的數據包的 IP 和 TCP 協議頭進行脩改,再對整箇數據包計算摘要的,來確定髮送數據包和接收數據包的對應關繫。同時脩改瞭單嚮時延的計算方法,加入瞭類似滑動窗口的技術,能夠支持大規模的抓包數據的單嚮時延計算。用該方法對網絡單嚮時延設計瞭測量方案,對實際網絡進行瞭長時間的測量,證明瞭該方法的有效性。
NAT협의회수개IP협의화TCP협의적협의두,종이무법유효적검사발송적수거포화접수도적수거포적일치성,도치피동측량단향망락성능지표실효。본논문통과대피동조취적수거포적 IP 화 TCP 협의두진행수개,재대정개수거포계산적요적,래학정발송수거포화접수수거포적대응관계。동시수개료단향시연적계산방법,가입료유사활동창구적기술,능구지지대규모적조포수거적단향시연계산。용해방법대망락단향시연설계료측량방안,대실제망락진행료장시간적측량,증명료해방법적유효성。
NAT will modify the IP protocol and TCP protocol header , and thus it is difficult to effectively check the indentity of the sending packets and receiving packets in a passive way to measure one-way-delay. In this paper, IP protocol and TCP protocol headers of captrued packets which was modified by NAT is modified again, then the entire packet is hashed. The hashed value becomes the id to determine the indentity between sending packets and receiving packets . The algrighm to caculate one-way delay is also improved to support large-scale data by adding technology similar to sliding window. According to this approach, a software is designed and incompleted to measure the one-way delay of the actual network .