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Troubleshoot Traceroute
About Traceroute Page
You are here: Device 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 waypoint. 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
Field | Action |
---|---|
Remote Host | Type the hostname or IP address of the destination host of the traceroute. |
Advanced Options | |
Don't Resolve Addresses |
|
Interface | From the list, select the interface on which traceroute packets are sent. If you select any, the traceroute requests are sent on all interfaces. |
Time-to-Live | From the list, select the time-to-live (TTL) hop count for the traceroute request packet. |
Type-of-Service | 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 |
|
Routing Instance | From the list, select the routing instance name for the ping attempt. |
Gateway | Type the gateway IP address to route through. |
Source Address | Type the source IP address of the outgoing traceroute packets. |
Bypass Routing |
|
Table 2: Ping Traceroute Results and Output Summary
Field | Function |
---|---|
Ping Traceroute Results and Output Summary | |
hop-number | Number of the hop (router) along the path. |
host | 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 | IP address of the router. |
as-number | AS number of the router. |
time1 | Round-trip time between the sending of the first traceroute packet and the receiving of the corresponding Time Exceeded packet from that particular router. |
time2 | Round-trip time between the sending of the second traceroute packet and the receiving of the corresponding Time Exceeded packet from that particular router. |
time3 | 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. |