Linux get network interfaces

Список сетевых интерфейсов Linux

В операционной системе Linux не только жесткие и SSD диски представлены файлами в специальной файловой системе, но и сетевые интерфейсы. Существует несколько способов посмотреть список сетевых интерфейсов Linux, но самый простой из них — это просто посмотреть содержимое папки в файловой системе.

В этой небольшой статье мы рассмотрим все основные способы выполнить эту задачу в терминале или графическом интерфейсе.

Список сетевых интерфейсов Linux

Сетевые интерфейсы проводного интернета Ethernet обычно имеют имя, начинающиеся с символов enp, например, enp3s0. Такое именование используется только если ваш дистрибутив использует systemd, иначе будет применена старая система именования, при которой имена начинаются с символов eth, например eth0. Беспроводные сетевые интерфейсы, обычно называются wlp или wlx при использовании systemd, например, wlp3s0. Без использования systemd имя беспроводного интерфейса будет начинаться с wlan, например wlan0. Все остальные интерфейсы обычно виртуальные. Один из самых основных виртуальных интерфейсов — lo. Это локальный интерфейс, который позволяет программам обращаться к этому компьютеру. А теперь рассмотрим несколько способов посмотреть их список.

1. Файловая система

Все файлы устройств сетевых интерфейсов находятся в папке /sys/class/net. Поэтому вы можете посмотреть её содержимое:

2. Утилита ifconfig

Утилита ifconfig выводит не только список сетевых интерфейсов, но и информацию о них, такую как состояние, IP адрес, MAC адрес и другие параметры. Для отображения всех интерфейсов достаточно выполнить программу без параметров:

3. Утилита ip

Программа ifconfig устарела и ей на смену пришла утилита ip. Она объединяет в себе функции нескольких программ, например ifconfig, route, brctl и других. Посмотреть список устройств с помощью ip можно выполнив команду:

Здесь информации намного меньше, показывается только состояние устройства, MTU и ещё несколько параметров. Можно вывести информацию в более компактном виде, использовав опцию -br:

В таком случае все данные отображаются в одну строчку, выводится состояние, MAC адрес и ещё несколько опций.

4. Утилита nmcli

Посмотреть всю нужную информацию можно и с помощью консольной утилиты управлением брандмауэром — nmcli:

Здесь выводится подключение NetworkManager, связанное с конкретным устройством, а также его состояние.

5. Утилита netstat

Программа netstat тоже умеет показывать сетевые интерфейсы и статистику по переданным данным если ей передать опцию -i:

6. Файл /proc/net/dev

В файле /proc/net/dev тоже содержится список всех сетевых интерфейсов, а также статистика их использования:

Выводы

Теперь вы знаете как посмотреть сетевые интерфейсы в Linux, как видите, это очень просто сделать. Если у вас остались вопросы, спрашивайте в комментариях!

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How to list network interfaces in Ubuntu

A network interface is a software interface for the networking hardware. In Linux-based systems like Ubuntu, network interfaces are of two types: virtual and physical network interfaces. A simple network hardware device, such as a network interface controller, comes under the category of the physical network interface. Ethernet network card or eth0 is an example of it. On the other hand, a virtual network interface does not have a physical existence but is associated with any physical device. VLANs, bridges, Loopback are examples of virtual network interfaces.

In Ubuntu, you can configure network interfaces at the installation time or after the complete setup of the operating system, whether it is a physical or virtual network interface. To configure network settings via the Ubuntu command line, you must first know how many network interfaces exist on the

machine. This article will show you how to list network interfaces in Ubuntu using five different methods. So let’s get started!

Method 1: How to list network interfaces in Ubuntu using ip command

Linux administrators are familiar with the “ip” command, which is a powerful tool for configuring network interfaces. The “ip” stands for Internet protocol. In Ubuntu, the “ip” command can be utilized to assign and delete addresses and routes, put up or down interfaces, control ARP cache, and more. On all modern network interfaces, “iproute” is the package that contains the “ip” utility.

Now, we will see how we can use the “ip” command for listing the network interface in Ubuntu. For this, we will utilize the “link” option with the “ip” command. This option is used to list out and modify network interfaces:

In the “ip” command, there is another option that can be used for the same purpose. Adding the “address” option in the “ip” command will also show you the list of network interfaces and their IP addresses in the Ubuntu terminal:

Method 2: How to list network interfaces in Ubuntu using nmcli command

The “nmcli” stands for Network Manager Command-Line Tool. In Ubuntu, network status is reported, and the Network Manager is controlled using nmcli. You can also utilize this tool as an alternative to nm-applet and other graphical clients. This command is also used for creating, viewing, deleting, activating, and deactivating network connections.

By using “nmcli”, if you want to list out network interfaces in Ubuntu, then write out the below-given command in your terminal:

Here “device” option will list out the network interfaces, and the “status” will display their current status on the system:

To view the profile of the network interfaces, utilize this command in your terminal:

This command will retrieve the profile information of the network interface from the “/etc/sysconfig/network-scripts” file, comprising connection name as “NAME”, Universal Unique Identifier as “UUID“, network interface type as “TYPE”, and lastly, device name as “DEVICE”:

Method 3: How to list network interfaces in Ubuntu using netstat command

Network statistics or “netstat” is another utility used in Ubuntu to display network interface statistics, routing tables and monitor incoming and outgoing network connections. This command-line tool is essential for Linux-based systems and network administrators for resolving network-related issues and determining traffic performance.

In the netstat command, the “-i” option is added to list all network interface packet transactions. Execution of the below-given will also you the active network interfaces on your Ubuntu system:

Method 4: How to list network interfaces in Ubuntu using ifconfig command

The kernel-resident network interfaces are configured with the help of “ifconfig” or interface configuration command. This utility is used for setting up the interfaces as needed at boot time. After that, it is typically used only when system tuning or debugging is required. You can also use “ipconfig” command for the assignment of an IP address and netmask to an interface and to enable or disable it.

The below-given command will list out all the network interfaces of your Ubuntu system even if they are not active:

You can also utilize the below-given command for the same purpose:

Method 5: How to list network interfaces in Ubuntu using the “/sys/class/net/” file

The “/sys/class/net/” file contains the names of network interfaces or the network cards on your system. Utilize the “ls” command to list out the network interfaces present in this file:

Conclusion

When you operate as a Linux administrator, you are responsible for managing the system’s network configuration. Both physical and virtual network interfaces can be configured at installation or after setting up the whole Ubuntu system. To make any required changes in the network interface, you must know the information related to network interfaces. This article demonstrated how to list network interfaces in Ubuntu using five different methods. All of the discussed utilities are simple and easy to implement. Try any of them for getting a list of your network interfaces.

About the author

Sharqa Hameed

I am a Linux enthusiast, I love to read Every Linux blog on the internet. I hold masters degree in computer science and am passionate about learning and teaching.

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List Network Interfaces in Debian 10

As a system administrator or a normal user, you often need to perform network configurations. Before doing so, you should know how many network interfaces are available in your system. This article will discuss various ways to list network interfaces in Debian systems.

The commands listed in this article were run using the command-line Terminal application. To launch the Terminal application in Debian, click the Activities tab in the top left corner of the desktop and type terminal in the search bar. When the search result appears, click on the Terminal icon to open the Terminal.

Note: All the commands discussed in this article have been executed with the Debian 10 Buster system.

Method #1: IP Command

The most common and easiest way to list network interfaces is by using the IP command. This command provides a wide array of information about your system’s network interfaces.

To list the network interfaces in your system, issue the following command in Terminal:

The above command lists all the network interfaces available in your system. The above output shows that there are three interfaces in the system: one loopback interface (lo) and two Ethernet interfaces (eth0 and eth1) are listed, along with other statistics. This command will also show some other useful information about the network interfaces, including IP address, status (UP or DOWN), MAC address, etc.

Note: You may have different network interface names based on your system’s hardware.

You can also use the following IP command to list the network interfaces:

Method #2: ifconfig Command

The ifconfig command has now become obsolete but is still supported in many Linux distributions. You can use the ifconfig command to list the network interfaces available in your system.

Instead of typing ifconfig, type the command /sbin/ifconfig to list the network interfaces in your system.

In addition to listing the network interfaces, the above command will show other useful information about the network interfaces, including IP address, MTU size, number of sent/received packets, etc.

Method #3: netstat Command

The netstat command can also be used to list the network interfaces available in your system. To do so, type netstat, followed by the -i flag, as follows:

The above command lists the available network interfaces in your system, along with other useful information, such as the number of sent received packets, MTU size, etc.

Method #4: nmcli Command

The nmcli command also provides information about network interfaces. The nmcli command is available with Debian distributions that are running on GUI interfaces. However, if you are working on a non-GUI system, you will need to install the network manager using the following command in Terminal:

Once installation is complete, run the below commands in Terminal to enable and start the network manager:

To list the available network interfaces in your system, run the below command in Terminal:

The above command lists brief information about the available network interfaces.

Method #5: /sys/class/net Directory

You can also view network interfaces in your system by viewing the contents of the /sys/class/net directory. To do so, run the following command in Terminal:

The above command returns a concise output displaying only the names of the interfaces available in your system.

Method #6: /proc/net/dev File

The /proc/net/dev file also contains information about network interfaces. You can view the available network interfaces in your system by viewing the contents of this file. Run the following command in the Terminal to do so:

The above command lists the network interfaces available in the system, along with some other information about the interfaces.

Conclusion

The great thing about Linux is that it allows you to perform the same job in different ways. This article discussed various methods through which you can list the network interfaces in your Debian system.

About the author

Karim Buzdar

Karim Buzdar holds a degree in telecommunication engineering and holds several sysadmin certifications. As an IT engineer and technical author, he writes for various web sites. He blogs at LinuxWays.

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