How to ping the network in linux system

How to ping the network in Linux system: execute the [ping host name or IP address] command. The ping command is a commonly used network command. It is usually used to test the connectivity with the target host, such as [ping 192.168.1.1].

The ping command of Linux system is a commonly used network command. It is usually used to test the connectivity with the target host. We often say "ping a certain machine , see if it is open." When the web page cannot be opened, it will say "Try pinging the gateway address 192.168.1.1 first."

It sends ICMP ECHO_REQUEST packets to network hosts (send ICMP ECHO_REQUEST to network hosts) and displays the response, so that we can determine whether the target host is accessible based on the information it outputs (but this is not absolute). In order to prevent detection through ping, some servers set firewall settings to disable ping or disable ping in kernel parameters. In this way, it is impossible to determine whether the host is still open through ping.

Ping under Linux is slightly different from ping under Windows. Ping under Linux will not terminate automatically. You need to press ctrl c to terminate or use the parameter -c to specify the number of responses required to complete.

1. Command format:

ping [Parameter] [Host name or IP address]

2. Command function:

The ping command is used to: determine the status of the network and each external host; track and isolate hardware and software problems; test, evaluate, and manage the network. If the host is running and connected to the network, it responds to the loopback signal. Each echo request contains an Internet Protocol (IP) and ICMP header, followed by a tim structure and enough bytes to fill out the packet. The default is to continuously send echo signal requests until an interrupt signal is received (Ctrl-C).

The ping command sends one datagram per second and prints a line of output for each received response. The ping command calculates round-trip time and packet loss statistics, and displays a brief summary upon completion. The ping command ends when the program times out or when a SIGINT signal is received. The Host parameter is either a valid hostname or an Internet address.

3. Command parameters:

-d Use the SO_DEBUG function of Socket.

-f Limit detection. Send a large number of network packets to a machine quickly and see its response.

-n Only outputs numerical values.

-q does not display any transmitted packet information, only the final result.

-r Ignore the ordinary Routing Table and send the data packet directly to the remote host. Usually it is to check whether there is a problem with the network interface of the machine.

-R Record the routing process.

-v displays the execution process of the instruction in detail.

-c Number: Stop after sending the specified number of packets.

-i Number of seconds: Set the interval in seconds to send a network packet to a machine. The default value is to send it once a second.

-I Network interface: Use the specified network interface to send data packets.

-l Preloading: Set the data packet to be sent before sending the request information.

-p Template style: Set the template style for filling data packets.

-s Number of bytes: Specify the number of data bytes sent. The default value is 56. Plus the 8-byte ICMP header, the total is 64 ICMP data bytes.

-t Survival value: Set the size of the survival value TTL.

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