How to resolve network card issues on CentOS 7
If there are issues with the network card in CentOS7, you can try the following solutions:
- Check the physical connection: Make sure the network cable is properly connected and not loose, and that the plug is not damaged.
- Check the network card driver: Use the command lspci | grep Ethernet to see if the network card has been correctly recognized. If it is not recognized correctly, you can try reinstalling the network card driver.
- Restart the network service by using the command “service network restart” to ensure that the configurations are loaded correctly.
- Check the network configuration files: locate the corresponding network configuration file in the /etc/sysconfig/network-scripts/ directory (usually named in the form of ifcfg-
) and verify if the configuration is correct. - Check the IP address and gateway: Use the command ‘ip addr show’ to check if the network card has obtained the correct IP address and gateway. If not obtained, you can try using the command ‘dhclient’ to re-request the IP address.
- Check the firewall configuration: If the firewall is enabled on the system, it may block network connections. You can use the command ‘systemctl status firewalld’ to check the firewall status and adjust the firewall rules as needed.
- To check if the network service is enabled, use the command “systemctl status network” to see if it is running. If it is not running, you can start the network service with “systemctl start network”.
If none of the above methods work, it is recommended to check if the hardware devices are functioning properly, or try updating the system or replacing the network card.
