247
Using diagnostic tools
This chapter describes how to use the ping and traceroute utilities.
Ping
Use the ping utility to determine if a specific address is reachable.
A ping operation involves the following steps:
1.
The source device sends ICMP echo requests to the destination device.
2.
The destination device responds by sending ICMP echo replies to the source device after
receiving the ICMP echo requests.
3.
The source device displays related statistics after receiving the replies.
You can ping the IP address or the host name of a device. A prompt appears if the host name cannot
be resolved.
If the source device does not receive an ICMP echo reply within the timeout time, it displays:
•
A prompt.
•
Ping statistics.
If the source device receives ICMP echo replies within the timeout time, it displays:
•
Number of bytes for each echo reply.
•
Message sequence number.
•
Time to Live (TTL).
•
Response time.
•
Ping statistics.
Ping statistics include:
•
Number of echo requests sent.
•
Number of echo replies received.
•
Percentage of echo replies not received.
•
Minimum, average, and maximum response time.
Traceroute
Traceroute retrieves the IP addresses of Layer 3 devices in the path to a specific destination. You
can use traceroute to test network connectivity and identify failed nodes.
You can traceroute the IP address or the host name of a destination device. If the target host name
cannot be resolved, a prompt appears.
A traceroute operation involves the following steps:
1.
The source device sends a packet with a Time to Live (TTL) value of 1 to the destination device.
2.
The first hop device responds with an ICMP TTL-expired message to the source. In this way,
the source device gets the address of the first device.
3.
The source device sends a packet with a TTL value of 2 to the destination device.
4.
The second hop responds with an ICMP TTL-expired message. In this way, the source device
gets the address of the second device.
Summary of Contents for FlexNetwork NJ5000
Page 12: ...x Index 440 ...
Page 39: ...27 Figure 16 Configuration complete ...
Page 67: ...55 Figure 47 Displaying the speed settings of ports ...
Page 78: ...66 Figure 59 Loopback test result ...
Page 158: ...146 Figure 156 Creating a static MAC address entry ...
Page 183: ...171 Figure 171 Configuring MSTP globally on Switch D ...
Page 243: ...231 Figure 237 IPv6 active route table ...