D-Link DES-3010FA, Cli Manual

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D-Link DES-3010FA/GA/PA CLI Reference Guide
Page 163
traceroute
The traceroute User or Privileged EXEC mode command discovers routes that packets actually take when travel-
ing to their destination.
Syntax
traceroute { ip-address | hostname }[ size packet_size ] [ ttl max-ttl ] [ count packet_count ] [ timeout time_out ]
[ source ip-address ] [ tos tos ]
Parameters
•
ip-address — IP address of the destination host.
•
hostname — Host name of the destination host. (Range: 1-158 characters)
•
packet_size — Number of bytes in a packet. (Range: 40-1472)
•
max-ttl — The largest TTL value that can be used. The traceroute command terminates when the destina-
tion is reached or when this value is reached. (Range:1-255)
•
packet_count — The number of probes to be sent at each TTL level. (Range:1-10)
•
time_out — The number of seconds to wait for a response to a probe packet.
(Range:1-60)
•
ip-address — One of the device’s interface addresses to use as a source address for the probes. The device
normally selects what it feels is the best source address to use.
•
tos — The Type-Of-Service byte in the IP Header of the packet. (Range: 0-255)
Default Configuration
The default number of bytes in a packet is 40.
The default maximum TTL value is 30.
The default number of probes to be sent at each TTL level is 3.
The default timeout interval in seconds is 3.
Command Mode
User or Privileged EXEC mode
User Guidelines
The traceroute command takes advantage of the error messages generated by the routers when a datagram
exceeds its time-to-live (TTL) value.
The traceroute command starts by sending probe datagrams with a TTL value of one. This causes the first router
to discard the probe datagram and send back an error message. The traceroute command sends several probes
at each TTL level and displays the round-trip time for each.
The traceroute command sends out one probe at a time. Each outgoing packet may result in one or two error
messages. A "time exceeded" error message indicates that an intermediate router has seen and discarded the
probe. A "destination unreachable" error message indicates that the destination node has received the probe and
discarded it because it could not deliver the packet. If the timer goes off before a response comes in, the
traceroute command prints an asterisk (*).
The traceroute command terminates when the destination responds, when the maximum TTL is exceeded or
when the user interrupts the trace by pressing Esc .