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Description: You can use the traceroute diagnostic tool 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 for 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.
To use the traceroute tool:
- Select Troubleshoot>Traceroute in the J-Web
user interface if you are using SRX5400, SRX5600, or SRX5800 platform.
Select Administration>Traceroute in the J-Web user interface.
- Click the expand icon next to Advanced options.
- Enter information in the Traceroute page as described
in Table 279.
The Remote Host field is the only required field.
- 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 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 279: Ping Traceroute Troubleshooting Options
Identifies the destination host of the traceroute.
Type the hostname or IP address of the destination host.
Don't Resolve Addresses
Determines whether or not hostnames of the hops along the path are displayed, in addition to IP addresses.
Specifies the IP address of the gateway to route through.
Type the gateway IP address.
Specifies the source address of the outgoing traceroute packets.
Type the source IP address.
Determines whether or not 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.
Specifies the interface on which the traceroute packets are sent.
From the list, select the interface on which traceroute packets are sent. If you select any, the traceroute requests are sent on all interfaces.
Specifies the maximum time-to-live (TTL) hop count for the traceroute request packet.
From the list, select the TTL.
Specifies the type-of-service (ToS) value to include in the IP header of the traceroute request packet.
From the list, select the decimal value of the ToS field.
Resolve AS Numbers
Determines whether or not the autonomous system (AS) number of each intermediate hop between the device and the destination host is displayed.
|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.