In a local area network, sometimes we need to see if a certain computer has a connection. At this time, we can use some dos commands to implement this function. In the following, this article will show you how to use the ping command to check whether a computer in your LAN has established a connection.
1. Introduction to the ping command.
The ping command is one of the most commonly used network testing tools in the Windows operating system. It can be used to test connectivity between two computers and return information such as response time, packet loss rate, etc. Through the ping command, we can determine whether the target computer is ** and whether the network connection is normal.
2. Use the ping command to check whether a computer in the LAN has established a connection.
Open the Command Prompt window: Press Win+R, enter "cmd" and press enter to open the Command Prompt window.
Enter the ping command: In the command prompt window, enter "ping IP address" or "ping hostname", where the IP address or hostname is the IP address or hostname of the computer you want to test. For example, if you want to test that the IP address is 192168.1.100 computers are already connected, you can type "ping 192."168.1.100”。
Check the response result: After pressing the Enter key, the system sends an ICMP packet to the target computer and waits for a response from the target computer. If the target computer has already established a connection, information such as response time and TTL value is returned;If the target computer does not establish a connection or the network connection is abnormal, an error message indicating a timeout or unreachable is displayed.
3. Other commonly used dos commands.
In addition to the ping command, there are a number of other DOS commands that can also be used to check if a computer in the LAN has established a connection. Here are a few commonly used dos commands:
netstat command: Displays the currently active network connections and listening ports, as well as the IDs of the protocols and processes used for each connection. With the netstat command, we can see if the target computer already has a network connection.
nbtstat command: can display the statistics and connection information of the NetBIOS (NetBT) protocol based on TCP IP. Through the nbtstat command, we can check whether the target computer has joined a certain domain, and can obtain the name of the target computer, the workgroup it belongs to, and other information.
Tracert Command: Can display the IP address and latency time of all routers that the packet travels through from the local computer to the destination computer. With the tracert command, we can determine whether the target computer is able to access the Internet normally and whether there is a problem with the network connection.
4. Answers to relevant questions.
What do the response times and ttl values of the ping command represent?A: The response time of the ping command represents the time interval between a packet being sent from the local computer to the destination computer and back;The TTL value represents the lifetime of the packet, and with each router it passes, the TTL value is reduced by 1, and when the TTL value is 0, the packet is dropped.
If the ping command displays "Request timed out" or "Destination host cannot be reached", what is the cause?Answer: This may be due to the fact that the target computer is not turned on, is not connected to the network, or the firewall blocks the ping request. The status and network connectivity of the target computer need to be further checked.
What is the difference between the netstat command and the nbtstat command?A: The netstat command is mainly used to display the currently active network connections and listening ports, while the nbtstat command is mainly used to display the netbios protocol statistics and connection information based on TCP IP. Both have different functions, but both can be used to see if a computer on a LAN is already connected.
What is the purpose of the tracert command?A: The tracert command can show the IP address and latency time of all routers that the packet travels through from the local computer to the destination computer. With the tracert command, we can determine whether the target computer is able to access the Internet normally and whether there is a problem with the network connection.