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Using the J-Web Traceroute Tool

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

To use the traceroute tool:

1. Select Troubleshoot>Traceroute.
2. Next to Advanced options, click the expand icon.
3. Enter information into the Traceroute page (see Table 1).

   Table 1: Traceroute Field Summary

   Field	Function	Your Action
   Remote Host	Identifies the destination host of the traceroute. The Remote Host field is the only required field.	Type the hostname or IP address of the destination host.
   Advanced Options
   Don't Resolve Addresses	Determines whether hostnames of the hops along the path are displayed, in addition to IP addresses.	Suppress the display of the hop hostnames by selecting the check box. Display the hop hostnames by clearing the check box.
   Gateway	Specifies the IP address of the gateway to route through.	Type the gateway IP address.
   Source Address	Specifies the source address of the outgoing traceroute packets.	Type the source IP address.
   Bypass Routing	Determines whether traceroute packets are routed by means of the routing table. If the routing table is not used, traceroute packets are sent only to hosts on the interface specified in the Interface box. If the host is not on that interface, traceroute responses are not sent.	Bypass the routing table and send the traceroute packets to hosts on the specified interface only by selecting the check box. Route the traceroute packets by means of the routing table bu clearing the check box.
   Interface	Specifies the interface on which the traceroute packets are sent.	Select the interface on which traceroute packets are sent from the list. If you select any, the traceroute requests are sent on all interfaces.
   Time-to-Live	Specifies the maximum time-to-live (TTL) hop count for the traceroute request packet.	Select the TTL from the list.
   Type-of-Service	Specifies the type-of-service (TOS) value to include in the IP header of the traceroute request packet.	Select the decimal value of the TOS field from the list.
   Resolve AS Numbers	Determines whether the autonomous system (AS) number of each intermediate hop between the device and the destination host is displayed.	Display the AS numbers by selecting the check box. Suppress the display of the AS numbers by clearing the check box.

4. Click Start.

   The results of the traceroute operation are displayed in the main pane. If no options are specified, each line of the traceroute display is in the following format:

   hop-number host (ip-address) [as-number]time1 time2 time3

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

5. You can stop the traceroute operation before it is complete by clicking OK while the results of the traceroute operation appear.