1. Online Tracert Traceroute Tool Description
Tracert (Trace Route) is a route-tracing utility that is used to determine the IP datagram access paths taken by target. IP Tracert command survival time (TTL) field and ICMP error messages to determine the route from one host to another host on the network.
2. Tracert works
By sending a different IP survival time (TTL) to target "Internet Control Message Protocol (ICMP)" value of echo packets, Tracert diagnostic procedures to determine the route taken to a destination. It requires each router on the path prior to forwarding the data packet on at least the TTL is decremented by one packet. TTL on the packet is reduced to 0, the router should be the "ICMP Time Exceeded" message back to the source system. Tracert first transmission TTL response packet 1, and each subsequent transmission process TTL incremented by 1, until the target response or the TTL reaches a maximum, to determine the route. By examining the intermediate routers send back the "ICMP Time Exceeded" message to determine the routing. Some routers do not ask directly discarded by TTL expired packets, which do not see in the Tracert utility.
3. Tracert command Detailed and usage
Tracert command supports a variety of options, as shown below.
tracert [-d] [-h maximum_hops] [-j host-list] [-w timeout] target_name
-d – 指定不将 IP 地址解析到主机名称。
-h maximum_hops – 指定跃点数以跟踪到称为 target_name 的主机的路由。
-j host-list – 指定 Tracert 实用程序数据包所采用路径中的路由器接口列表。
-w timeout – 等待 timeout 为每次回复所指定的毫秒数。
target_name – 目标主机的名称或 IP 地址。
the tracert [/ Caption] In the drawings we can see that the leftmost A., 1,2,3,4 - 9, which I marked on broadband use, after 10 routing nodes, can be reached Baidu services; middle B. this three units is ms, is the speed of our connection to each routing node and multi-speed return times the average of the feedback link; because Tencent in China, after China Unicom backbone network is very good, so very small, there is some reference value, but not the only, nor as the main reference; such as a host, 200 and 300, which 100ms, in fact, does not signify anything; the latter C. IP, that is, each routing node corresponding IP, each input what ip, ip http://tool.chinaz.com you through a detailed inquiry to get to know ; D. *, in the first seven routing node, the return message is time-out, which means that the current broadband routing nodes and we are using, is not China Unicom As for the reason, there are many, such as: specially made on the road filtering limits; example The real problem is routing, etc., to analyze specific issues; 4. If at the time of the test, a large number are * and return a timeout, it shows that this IP, routing node has a problem at all. Reference to: http: //tool.chinaz.com/
Reproduced in: https: //my.oschina.net/766/blog/211276