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Using the traceroute Command

Use the CLI traceroute command to display a list of routers between the Services Router and a specified destination host. This command is useful for diagnosing a point of failure in the path from the Services Router to the destination host, and addressing network traffic latency and throughput problems.

The Services Router 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.

Alternatively, you can use the J-Web interface. (See Using the J-Web Traceroute Tool.)

Enter the traceroute command with the following syntax. Table 65 describes the traceroute command options.

user@host> traceroute host <interface source-interface> <as-number-lookup>
<bypass-routing> <gateway address>
<inet> <logical-router logical-router-name>
<no-resolve> <routing-instance routing-instance-name>
<source address> <tos number>
<ttl number> <wait seconds>

To quit the traceroute command, press Ctrl-C.

Table 65: CLI traceroute Command Options

Option	Description
host	Sends traceroute packets to the hostname or IP address you specify.
interface source-interface	Sends the traceroute packets on the interface you specify. If you do not include this option, traceroute packets are sent on all interfaces.
as-number-lookup	Displays the autonomous system (AS) number of each intermediate hop between the router and the destination host.
bypass-routing	Bypasses the routing tables and send the traceroute packets only to hosts on directly attached interfaces. If the host is not on a directly attached interface, an error message is returned.
gateway address	Uses the gateway you specify to route through.
logical-router logical-router-name	Sends traceroute packets to this logical router.
inet	Forces the traceroute packets to an IPv4 destination.
no-resolve	Suppresses the display of the hostnames of the hops along the path.
routing-instance routing-instance-name	Uses the routing instance you specify for the traceroute.
source address	Uses the source address you specify in the traceroute packet.
tos number	Sets the type-of-service (TOS) value in the IP header of the traceroute packet. Specify a value from 0 through 255.
ttl number	Sets the time-to-live (TTL) value for the traceroute packet. Specify a hop count from 0 through 255.
wait seconds	Sets the maximum time to wait for a response.

Following is sample output from a traceroute command:

user@host> traceroute host2

traceroute to 173.24.232.66 (172.24.230.41), 30 hops max, 40 byte packets
 1  173.18.42.253 (173.18.42.253)  0.482 ms  0.346 ms  0.318 ms
 2  host4.site1.net (173.18.253.5)  0.401 ms  0.435 ms  0.359 ms
 3  host5.site1.net (173.18.253.5)  0.401 ms  0.360 ms  0.357 ms
 4  173.24.232.65 (173.24.232.65)  0.420 ms  0.456 ms  0.378 ms
 5  173.24.232.66 (173.24.232.66)  0.830 ms  0.779 ms  0.834 ms

The fields in the display are the same as those displayed by the J-Web traceroute diagnostic tool. Table 63 summarizes these output fields.

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