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Using Traceroute

Use the Traceroute page to trace a route between the device and a remote host. You can use the traceroute task to display a list of routers between the device and a specified destination host. The output is useful for diagnosing a point of failure in the path from the device to the destination host, and addressing network traffic latency and throughput problems.

The device generates the list of routers by sending a series of ICMP traceroute packets in which the time-to-live (TTL) value in the messages sent to each successive router is incremented by 1. (The TTL value of the first traceroute packet is set to 1.) In this manner, each router along the path to the destination host replies with a Time Exceeded packet from which the source IP address can be obtained.

The device sends a total of three traceroute packets to each router along the path and displays the round-trip time for each traceroute operation. If the device times out before receiving a Time Exceeded message, an asterisk (*) is displayed for that round-trip time.

Alternatively, you can enter the traceroute command at the J-Web CLI terminal. For more information, see Using the CLI Terminal. For more information about the traceroute command, see the Junos OS System Basics and Services Command Reference.

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