Simple method of network detection (1) ipconfig command. The ipconfig utility can be used to display the current TCP/IP configuration settings. This information is typically used to verify that the manually configured TCP/IP settings are correct. However, if the computer and the local area network use Dynamic Host Configuration Protocol (DHCP), the information displayed by this program may be more practical. At this point, ipconfig allows us to know if our computer has successfully obtained an IP address, and if so, can know what address it is currently assigned to. Knowing the computer's current IP address, subnet mask, and default gateway are actually necessary items for testing and failure analysis. When using ipconfig without any parameter options, it displays the IP address, subnet mask, and default gateway value for each configured interface. When using the all option (enter "ipconfig/all"), ipconfig can display the additional information (such as IP address, etc.) it has configured and used for the DNS and WINS servers, and display the physical address (MAC) built into the local NIC. address). If the IP address is obtained from a DHCP server, ipconfig will display the IP address of the DHCP server and the date on which the address is expected to expire. (2) ping command. Ping is a very frequently used utility in network simple diagnostics to determine if a local host can exchange (send and receive) datagrams with another host. According to the returned information ("Reply from..." indicates that there is a response;" Request TImed out " indicates no response", it can be inferred whether the TCP/IP parameters are set correctly and the operation is normal. The method of use is as follows: Table ping command usage Ping 127.0.0.0 This ping command is sent to the IP software of the local computer. If there is no response, there are some basic problems with the installation or operation of TCP/IP. Ping the local IP This command is sent to the IP address configured on your computer. Your computer should always respond to the ping command. If not, it indicates that there is a problem with the local configuration or installation. When this issue occurs, LAN users disconnect the network cable and resend the command. If this command is correct after the network cable is disconnected, it means that another computer may be configured with the same IP address. Ping other IPs in the LAN This command should send datagrams from your computer, go to other computers via the network card and network cable, and then return. A reply echo is received indicating that the network card and carrier in the local network are operating correctly. However, if you receive 0 echo responses, it means that the subnet mask is incorrect or the network card is configured incorrectly or there is a problem with the cable system. Ping Gateway IP This command, if answered correctly, indicates that the gateway router in the LAN is running and able to respond. Ping Remote IP If four replies are received, the default gateway is successfully used. For dial-up users, they can successfully access the Internet (but do not rule out the ISP's DNS will have problems). Ping If there is no response, the IP address of the DNS server is incorrectly configured or the DNS server is faulty (for dial-up users, some ISPs do not need to adjust the DNS server). You can also use this command to implement the conversion of domain names to IP addresses. If all the ping commands listed above work properly, then the computer's ability to communicate locally and remotely is basically achievable. However, the success of these commands does not mean that all network configurations are ok, for example, some subnet mask errors may not be detected by these methods.
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