Установить telnet linux debian

How to install Telnet server & client on Debian 11 Bullseye linux

Telnet has been around since 1969. Telnet is originally an abbreviation for “Telecommunication Network” and describes a protocol from the TCP/IP world with which text-based commands can be executed on remote computers.

Using it the user can have remote access to the remote computer using Telnet client-server architecture via IP address. A suitable telnet client is available for almost all operating systems. It is still used to configure old hardware, especially industrial and scientific devices to diagnose and resolve technical problems.

How does Telnet work?

Telnet works on Client and Server connection architecture. After installing, the client starts to establish a connection for a session with the command “telnet” and for security, the user has to authenticate with a password. The port it uses to connect is 23, however, it is possible to use other standard ports by specifying the desired destination port in addition to the computer name or IP address just like we do while connecting remote system via SSH. Once the session has been established, the protocol transfers the text input from the client to the remote computer. Commands are executed there and results or status messages are sent back to the client in text form.

Today, the Telnet protocol is considered less over SSH as it is largely insecure because the data exchanged is not encrypted.

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Пакет: telnet (0.17-41.2)

Команда telnet используется для взаимодействия в режиме реального времени с другими компьютерами по протоколу TELNET.

Не следует использовать данный клиент для удалённого входа на компьютер, используйте клиент ssh или различные варианты вроде telnet-ssh или клиенты Kerberized TELNET. Основной причиной этого является то, что данная реализация пересылает имя пользователя и пароль в виде обычного текста.

С другой стороны, настоящая программа вполне удовлетворяет целям сетевой диагностики и может использоваться, например, для тестирования служб SMTP, что делает её весьма полезной.

Теги: Системное администрирование: Вход, Пользовательский интерфейс: Командная оболочка, Сеть: Клиент, Сетевой протокол: protocol::ipv6, protocol::telnet, Роль: Программа, Инструментарий интерфейса: Ncurses TUI, Цель: Вход

Другие пакеты, относящиеся к telnet

• зависимости

• рекомендации

• предложения

• enhances

• dep: libc6 (>= 2.15) [не arm64, ppc64el] библиотека GNU C: динамически подключаемые библиотеки
  также виртуальный пакет, предоставляемый libc6-udeb dep: libc6 (>= 2.17) [arm64, ppc64el]
• dep: libgcc1 (>= 1:3.0) [не armel, armhf] вспомогательная библиотека GCC dep: libgcc1 (>= 1:3.5) [armel, armhf]
• dep: libstdc++6 (>= 5) стандартная библиотека GNU C++ версии 3
• dep: netbase основные файлы для поддержки сетей TCP/IP

Загрузка telnet

Загрузить для всех доступных архитектур

Архитектура	Размер пакета	В установленном виде	Файлы
amd64	68,8 Кб	163,0 Кб	[список файлов]
arm64	66,8 Кб	159,0 Кб	[список файлов]
armel	63,9 Кб	144,0 Кб	[список файлов]
armhf	64,0 Кб	124,0 Кб	[список файлов]
i386	70,2 Кб	164,0 Кб	[список файлов]
mips	70,4 Кб	175,0 Кб	[список файлов]
mips64el	71,7 Кб	199,0 Кб	[список файлов]
mipsel	71,0 Кб	175,0 Кб	[список файлов]
ppc64el	72,8 Кб	250,0 Кб	[список файлов]
s390x	66,9 Кб	167,0 Кб	[список файлов]

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How To Install and Use Telnet Client In Linux and Windows

Telnet is easiest remote management protocol used in Computer networks. It remains popular even today because of its simplicity. Telnet is a client server protocol where clients uses telnet tool which to connect remote telnet server. This telnet server may be switch, router, windows operating system, linux server or a printer. In this tutorial we will look how to install and enable telnet with some usage examples.

Install

Ubuntu, Debian, Mint, Kali

We can install telnet package with the following command in deb based Linux distributions.

Fedora, CentOS, RHEL

We can install telnet package with yum command for rpm based distributions like Fedora, centOS and RHEL.

Windows

As windows operating system do not have online package manager telnet is provided by inline. By defualt telnet server and client applications are not enabled. We will enable the client where server can be enabled too. Follow these instructions.

1. Click Start >Control Panel.
2. Click Programs and Features.
3. Click Turn Windows features on or off.
4. In the Windows Features dialog box, check the Telnet Client check box.

Security

As telnet is old fashion protocol it provides some defects. One of the most important negative issue with telnet is its security features. Telnet do not have any encryption support as builtin. So telnet traffic can be easily eavesdropped during transmission. So do not rely telnet on insecure networks.

Connect Telnet Server

We will start by simply connecting a telnet server. The simplest form is just providing the host name or IP address of the telnet server. The syntax is like below. In this example telnet server is a Ubuntu 17.10 .

Connect Different Telnet Port

The default port for telnet is TCP 23 . By default it is not specified during connection. But in some cases telnet server may use different then 23. We can specify the port number by adding after the host name or IP address. In this example we will connect port number 2323 .

Specify Login Name

Most cases telnet servers requires authentication. In order to authenticate ourself we need to provide some user name and password. The regular usage is providing username and then put password interactively. We will use -l which stands for login.

$ telnet -l ismail 192.168.115.143

Interactive Shell

Telnet provides interactive shell where it provides its own environment. We can enter interactive shell just putting telnet command.

We can get help for interactive shell with help command. We can see that we will use open command and the hostname or IP address to connect telnet server.

We will connect to the localhost telnet server.

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How To Install Telnet on Debian 11

In this tutorial, we will show you how to install Telnet on Debian 11. For those of you who didn’t know, Telnet is a terminal emulation program for TCP/IP networks that allows you to access another computer on the Internet or local area network by logging in to the remote system. Telnet listens to all the requests by the user usually on TCP port 23, but you can change it accordingly.

This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘ sudo ‘ to the commands to get root privileges. I will show you through the step-by-step installation of the Telnet on a Debian 11 (Bullseye).

Prerequisites

• A server running one of the following operating systems: Debian 11 (Bullseye).
• It’s recommended that you use a fresh OS install to prevent any potential issues
• A non-root sudo user or access to the root user . We recommend acting as a non-root sudo user , however, you can harm your system if you’re not careful when acting as the root.

Install Telnet on Debian 11 Bullseye

Step 1. Before we install any software, it’s important to make sure your system is up to date by running the following apt commands in the terminal:

sudo apt update sudo apt upgrade

Step 2. Installing Telnet on Debian 11.

By default, Telnet is available on Debian 11 base repository. Now we install the latest version of Telnet using the following command below:

Once installed, check to make sure Telnet status using the following command:

sudo systemctl status inetd

Step 3. Configure Firewall.

If you have UFW installed to connect to your remote running Telnet, you will need to set up an allow rule. By default, Telnet runs on port 23:

sudo ufw allow 23 sudo ufw reload sudo ufw enable

Step 4. Test Telnet Connection.

Now, log in to another Debian system and run the following command below:

You should see the following output:

Trying 192.168.77.21. Connected to 192.168.77.21. Escape character is '^]'. Debian 11 debian11 login: idroot Password:

You can also use Telnet to test open ports on a remote system. For example:

Congratulations! You have successfully installed Telnet. Thanks for using this tutorial for installing the latest version of Telnet on Debian 11 Bullseye. For additional help or useful information, we recommend you check the official Debian website.

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