Common Linux network faults and solutions

Common network faults encountered in Linux systems and how to deal with them

In the daily use of Linux systems, various network faults are often encountered. These glitches may result in a loss of Internet access, an inability to connect to other devices, or a slowdown in network speeds. For these common network failures, we can use some simple methods to troubleshoot and handle them to restore the network connection. This article will introduce some common network failures and corresponding solutions.

1. IP address setting error
The IP address is the unique identifier of the device when it is connected to the network. If an error is made when setting the IP address, it can cause problems with the network connection. Common errors include duplicate IP addresses, incorrect subnet mask settings, etc. If you encounter an IP address setting error, you can troubleshoot and handle it through the following steps:

1. Use the ifconfig command to check the IP address and subnet mask of the current device to confirm whether the settings are correct;
2. If the IP address or subnet mask is wrong, you can use the ifconfig command to modify the IP address and subnet mask.

2. DNS resolution failure
DNS (Domain Name System) is used to resolve domain names into IP addresses. If DNS resolution fails, the Internet cannot be accessed through the domain name. Common DNS resolution failure situations include:

1. DNS server is unavailable;
2. DNS server configuration error;
3. Local DNS cache problem.

To address these problems, we can solve them in the following ways:

1. Check whether the DNS server is available, which can be detected through the ping command;
2. Check DNS If the server configuration is correct, you can use the vi editor to modify it;
3. To clear the local DNS cache, you can use the command "sudo systemctl restart systemd-resolved" to restart the parser service.

3. Slow network connection speed
If you encounter a slow network connection speed when using a Linux system, you can solve it by the following methods:

1. Check the network Bandwidth, you can use the command "ifconfig" to check the current bandwidth occupancy;
2. Check whether the network device is overloaded, you can use the "top" command to check the system running status, and confirm whether other programs are occupying too many network resources;
3. Check the network connectivity. You can use the "ping" command to test the connectivity between the network and the target host to determine whether a network failure is causing the slow speed.

4. Network connection problems caused by firewalls
The firewall in the Linux system can filter and restrict network traffic, but sometimes it may block legitimate network connections. If you encounter network connection problems, you can try turning off the firewall to verify whether it is related to the firewall. You can use the following commands to turn off the firewall:

1. Use the command "sudo systemctl status firewalld" to view the firewall status;
2. Use the command "sudo systemctl stop firewalld" to stop the firewall.

5. Router failure
If you cannot connect to other devices or access the Internet while using the Linux system, the router may be malfunctioning. You can use the following methods to troubleshoot:

1. Check whether the power supply of the router is normal;
2. Check whether the physical connection between the router and the computer is normal;
3. Restart the router. Sometimes router caching can cause problems.

The above are common network failures and corresponding solutions. When troubleshooting and handling network failures, we need to be patient and careful, step by step troubleshoot the possible causes, and try different methods to solve the problem. At the same time, you can also refer to the Linux system documentation and community for more help and solutions. Through continuous learning and practice, we can better master the skills of network troubleshooting and processing, and improve our network usage capabilities in Linux systems.

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