In the following example of the tracert command and its output, the packet travels through two routers (157.54.48.1 and 11.1.0.67) to get to host 11.1.0.1. Using the -d option with the tracert command instructs TRACERT not to perform a DNS lookup on each IP address, so that TRACERT reports the IP address of the near-side interface of the routers. TRACERT prints out an ordered list of the intermediate routers that return ICMP "Time Exceeded" messages. Note however that some routers silently drop packets that have expired TTLs, and these packets are invisible to TRACERT. The ICMP "Time Exceeded" messages that intermediate routers send back show the route. TRACERT sends the first echo packet with a TTL of 1 and increments the TTL by 1 on each subsequent transmission, until the destination responds or until the maximum TTL is reached. When the TTL on a packet reaches zero (0), the router sends an ICMP "Time Exceeded" message back to the source computer. Because each router along the path is required to decrement the packet's TTL by at least 1 before forwarding the packet, the TTL is effectively a hop counter. In these packets, TRACERT uses varying IP Time-To-Live (TTL) values. The TRACERT diagnostic utility determines the route to a destination by sending Internet Control Message Protocol (ICMP) echo packets to the destination. More Information How to Use the TRACERT Utility This article discusses the following topics: This article describes TRACERT (Trace Route), a command-line utility that you can use to trace the path that an Internet Protocol (IP) packet takes to its destination. For a Microsoft Windows 2000 version of this article, see 162326.
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