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About Traceroute Page
You are here: Administration > Tools > Traceroute.
The traceroute diagnostic tool uses a series of packets crafted to elicit an ICMP "time exceeded" messages from intermediate points in the network between your device and the specified host.
The time-to-live for a packet is decremented each time the packet is routed, so traceroute generally receives at least one "time exceeded" response from each way point. Traceroute starts with a packet with a time-to-live value of one, and increments the time to live for subsequent packets, thereby constructing a rudimentary map of the path between hosts.
Use this page to display a list of routers between the device and a specified destination host.
To use the traceroute tool:
- Click the expand icon next to Advanced options.
- Enter information in the Traceroute page as described
in Table 1.
The Remote Host field is the only required field.
- Click Start.
The results of the traceroute operation are displayed in Table 2. 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 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.
- Click OK to stop the traceroute operation before it is complete.
Table 1: Ping Traceroute Troubleshooting Options
Type the hostname or IP address of the destination host of the traceroute.
Don't Resolve Addresses
From the list, select the interface on which traceroute packets are sent. If you select any, the traceroute requests are sent on all interfaces.
From the list, select the time-to-live (TTL) hop count for the traceroute request packet.
From the list, select the decimal value of the type-of-service (ToS) value to include in the IP header of the traceroute request packet.
Resolve AS Numbers
From the list, select the routing instance name for the ping attempt.
Type the gateway IP address to route through.
Type the source IP address of the outgoing traceroute packets.
Table 2: Ping Traceroute Results and Output Summary
|Ping Traceroute Results and Output Summary|
Number of the hop (router) along the path.
Hostname, if available, or IP address of the router.
To suppress the display of the hostname, select the Don't Resolve Addresses check box.
IP address of the router.
AS number of the router.
Round-trip time between the sending of the first traceroute packet and the receiving of the corresponding Time Exceeded packet from that particular router.
Round-trip time between the sending of the second traceroute packet and the receiving of the corresponding Time Exceeded packet from that particular router.
Round-trip time between the sending of the third traceroute packet and the receiving of the corresponding Time Exceeded packet from that particular router.
Output = Complete path to the destination host not displayed
If the device does not display the complete path to the destination host, one of the following explanations might apply:
For more information about ICMP, see RFC 792, Internet Control Message Protocol.