


What is the command to query mac address in Linux?
Command to query the mac address: 1. "ifconfig -a", the HWaddr field of the output result is the MAC address; 2. "cat /etc/sysconfig/network-scripts/ifcfg-eth0", read the MAC Configuration file; 3. "cat /sys/class/net/eth0/address"; 4. "dmesg | grep eth0"; 5. "cat /proc/net/arp".
The operating environment of this tutorial: linux7.3 system, Dell G3 computer.
What is the mac address?
MAC (Media Access Control, media access control) is used to define the location of network devices. An identifier used to represent each site on the Internet, expressed in hexadecimal numbers, with a total of six bytes (48 bits). Among them, the first three bytes are codes (high-order 24 bits) assigned to different manufacturers by the IEEE registration authority RA, also known as "Organizationally Unique Identifier", and the last three bytes are (lower 24 bits) is assigned by each manufacturer to the adapter interface produced, called an extended identifier (uniqueness). An address block can generate 2^24 different addresses. The MAC address is actually the adapter address or adapter identifier. MAC is globally unique.
How to query the mac address in Linux
PS: Generally, the default network card file name is eth0, which can be determined based on the actual situation corresponding to the IP address. Just ethx.
1, <strong>ifconfig -a</strong>
The HWaddr field is the MAC address, which is the most commonly used method

2, cat /etc/sysconfig/network-scripts/ifcfg-eth0
(CentOS or Redhat configuration file)

below Both types can be viewed before IP is set. Can be used to solve the problem of binding between MAC and operating system. For example, if you install the operating system to a remote server, the mac address of the operating system is the address of host A. On host B, it cannot be started remotely because the MAC address is different (because the configuration file is still the mac address of A at this time). Since the OS will detect the hardware when it starts, obtain the MAC address of the hardware, and write it to the /sys/class/net/eth0/address file, after the OS obtains the mac address, before using the original MAC configuration file (that is, /etc /sysconfig/network-scripts/ifcfg-eth0), write the real mac address into the configuration file.
3、cat /sys/class/net/eth0/address
Check the MAC address of eth0
4, dmesg | grep eth0
dmesg' command is very important to diagnose device faults. When performing hardware connection or disconnection operations with the help of the 'dmesg' command, we can see the hardware detection or disconnection information.
5、cat /proc/net/arp
View the MAC of the remote IP connected to this machine The address
cannot see the MAC of the local machine, only the remote connection, which is mostly used by the server.
Recommended study: "PHP Video Tutorial"
The above is the detailed content of What is the command to query mac address in Linux?. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











The five basic components of the Linux system are: 1. Kernel, 2. System library, 3. System utilities, 4. Graphical user interface, 5. Applications. The kernel manages hardware resources, the system library provides precompiled functions, system utilities are used for system management, the GUI provides visual interaction, and applications use these components to implement functions.

VS Code One-step/Next step shortcut key usage: One-step (backward): Windows/Linux: Ctrl ←; macOS: Cmd ←Next step (forward): Windows/Linux: Ctrl →; macOS: Cmd →

To view the Git repository address, perform the following steps: 1. Open the command line and navigate to the repository directory; 2. Run the "git remote -v" command; 3. View the repository name in the output and its corresponding address.

Although Notepad cannot run Java code directly, it can be achieved by using other tools: using the command line compiler (javac) to generate a bytecode file (filename.class). Use the Java interpreter (java) to interpret bytecode, execute the code, and output the result.

There are six ways to run code in Sublime: through hotkeys, menus, build systems, command lines, set default build systems, and custom build commands, and run individual files/projects by right-clicking on projects/files. The build system availability depends on the installation of Sublime Text.

The main uses of Linux include: 1. Server operating system, 2. Embedded system, 3. Desktop operating system, 4. Development and testing environment. Linux excels in these areas, providing stability, security and efficient development tools.

To install Laravel, follow these steps in sequence: Install Composer (for macOS/Linux and Windows) Install Laravel Installer Create a new project Start Service Access Application (URL: http://127.0.0.1:8000) Set up the database connection (if required)

Installing Git software includes the following steps: Download the installation package and run the installation package to verify the installation configuration Git installation Git Bash (Windows only)
