If you want to test a machine's access connectivity to a specified network, you can use the ping -c command.
Windows operating systems, Linux operating systems, and Mac OS operating systems should all have this command built-in.
ping -c 4 hub-mirror.c.163.com is a command-line instruction used to test the network connection between your computer and the domain hub-mirror.c.163.com. This command uses the ping tool, which is one of the commonly used tools by network administrators to check network connectivity.
Command Explanation#
ping: This is the name of the command used to send ICMP (Internet Control Message Protocol) echo request messages to the specified host.-c 4: This is an option for thepingcommand, indicating that four echo requests will be sent. The-coption is followed by the number of echo requests you wish to send. In this example,4means four requests will be sent.hub-mirror.c.163.com: This is the domain you want to test the connection to.
Output After Command Execution#
When you execute this command, your computer will send four ICMP echo requests to hub-mirror.c.163.com. After each request is sent, if the other server responds, it will send an echo reply. The ping command will display the send and receive times for each request, as well as some statistics such as the minimum, average, and maximum round-trip time (RTT).
Example Output#
If the network connection is normal, the output may look like this:
PING hub-mirror.c.163.com (119.75.218.100) 56(84) bytes of data.
64 bytes from 119.75.218.100 (119.75.218.100): icmp_seq=1 ttl=50 time=23.4 ms
64 bytes from 119.75.218.100 (119.75.218.100): icmp_seq=2 ttl=50 time=22.1 ms
64 bytes from 119.75.218.100 (119.75.218.100): icmp_seq=3 ttl=50 time=24.3 ms
64 bytes from 119.75.218.100 (119.75.218.100): icmp_seq=4 ttl=50 time=23.7 ms
--- hub-mirror.c.163.com ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3004ms
rtt min/avg/max/mdev = 22.100/23.400/24.300/0.800 ms
Output Explanation#
- PING: Displays the domain you are pinging and its resolved IP address.
- 64 bytes: The size of each data packet sent.
- icmp_seq: ICMP sequence number, identifying each sent request.
- ttl: Time to Live, the lifespan of the packet, indicating the maximum number of hops the packet can take in the network.
- time: Round-trip time, measured in milliseconds, indicating the time from sending the request to receiving the reply.
- ping statistics: Statistical information including the number of packets sent and received, packet loss rate, and the minimum, average, maximum, and standard deviation of round-trip times.
Purpose#
Using the ping command can help you diagnose network issues, such as:
- Checking if the network connection is normal.
- Checking if the target server is responding.
- Evaluating network latency and packet loss.
I hope this helps you understand the purpose and output of the ping -c 4 hub-mirror.c.163.com command. If you have any questions, feel free to ask!