Network Diagnostic and Discovery with TraceroutePrepared and presented byPhD candidateYihua HeRoadmapIdentifying the AS PATHWhich AS a packet goes throughReview of how traceroute worksPossible ways

R1 f00的IP f00的IP f01的IP R3 f00的IP f01的IP R4 f00的IP f01的IP R5 f00的IP f01的IP 断掉上联端口会通过icmp重定向寻找到达目标的路径再R1上跟踪到也就是R4的f01的端口地址R1traceroute 1 112 msec

TracerouteTraceroute最简单的基本用法是：traceroute hostnameTraceroute 程序的设计是利用ICMP及IP header的TTL(Time To Live)栏位(field)首先traceroute送出一个TTL是1 的IP datagram(其实每次送出的为3个40字节的包包括源地址目的地址和包发出的时间标签)到目的地当路径上的第一个路由器 (r