Linux network commands revealed, easy to fix network faults

This topic will deeply explore the core role of network commands in the Linux operating system. With these commands, we can check network conditions and correct network faults in real time, and at the same time understand the data flow of the network. The article strives to refine Linux timers and explain in detail my unique experience in using Linux network commands.

1. ifconfig - View network interface information

As a key network management tool in the Linux system, ifconfig has outstanding advantages in network parameter configuration and status query. Especially when modifying core parameters such as network card IP address, MAC address and subnet mask, its performance is extremely good. Below is its detailed and accurate how-to guide:

ifconfig eth0

This system has the function of obtaining detailed information of the ethOS network card, covering details such as key parameters such as IP address, MAC address, and WAN broadcast address.

2. iwconfig - View wireless network interface information

Use the iwconfig command to obtain extremely detailed wireless network card information in wireless network connection mode, including parameters such as signal strength, channel type, and encryption mechanism. At this point, you can take the following actions:

iwconfig wlan0

We can obtain various parameter information of the wlan0 wireless network card.

3. netstat - View network connection status

Correct use of the Netstat command can accurately reveal the overall network connection status of the current computer. Through the full use of this technology, people can have an in-depth understanding of the connections and details of the internal activities of the system, as well as various related information, such as:

We can obtain all network connection information on the current system.

4. ping - test network connectivity

By using the Ping toollinux view network command, we can monitor network connectivity in real time. The principle is mainly to evaluate the network performance with the help of the returned information by sending data packets to the selected IP addresslinux view network command. Relevant code examples are provided below to show detailed operation steps.

ping

We can see whether the network with the 8b36e9207c24c76e6719268e49201d94 website is normal.

5. traceroute - trace packet path

The "Traceroute" tool can clearly display the path of data packets on the network. Through the operation of this command, we can accurately understand the router that the data packet needs to access and the number of hops it undergoes when passing it from the local host to the remote host. The specific performance is:

traceroute

We can see each router and hop count that the packet passed through during transmission.

6. dig - Query DNS records

The "dig" command is specially designed for DNS information query. Follow the instructions below to quickly obtain comprehensive information such as the IP address or MX, NS URL under the specified top-level domain name. The following is an example. You only need to enter the corresponding command to achieve the desired purpose:

dig

We can get the IP address and other related information of the GitHub website.

7. route - View and configure the routing table

The "route" command has the ability to finely view and configure the system routing table, helping you fully control the device router information and providing solid support for regular routing settings. For example, with a few keystrokes you can:

We can obtain the routing table information of the current system.

8. nmap - network scanning tool

Nmap is an efficient application designed to identify network devices and collect detailed information. Using this tool, we can accurately obtain information such as the type of service carried by each terminal device within the network and its corresponding public port. Just enter the relevant instructions to implement the operation.

nmap -sP 192.168.1.0/24

Real-time control and visual presentation of the operating status of all hosts in the 192.168.1.0/24 network.

9. tcpdump - packet capture tool

Relying on TCPdump's excellent performance and convenient and easy-to-use features, you can easily learn and control advanced network data packets, and deeply understand and analyze network traffic and complex behaviors. Just follow the steps below to make it happen.

tcpdump -5d014bbd12ce729225ff1d023780192e

We can capture all packets with destination port 80 on the eth0 network card.

Understanding and being familiar with basic Linux network management instructions can effectively improve the efficiency of your network connection management and maintenance. This guide includes an introduction to the Linux operating system with practical functions such as network interface information monitoring, fault diagnosis, and real-time traffic monitoring. It aims to provide users with comprehensive solutions to improve work efficiency and simplify schedule operations. We believe this document will become a valuable resource for improving your skills!

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