How to install Telnet on CentOS/RHEL Linux 6 & 7
Telnet is a protocol used to log in to computers remotely over a TCP/IP network. Once a connection is established with the remote computer, it becomes a virtual terminal and allows you to communicate with the remote computer. In this article, we will show you how to install Telnet and how to access remote systems through Telnet.
Open a terminal and enter the following command to install telnet:
yum install telnet telnet-server -y
Now telnet has been installed on your server. Next edit the file /etc/xinetd.d/telnet:
vi /etc/xinetd.d/telnet
Set disable = no:
# default: on # description: The telnet server serves telnet sessions; it uses \ # unencrypted username/password pairs for authentication. service telnet { flags = REUSE socket_type = stream wait = no user = root server = /usr/sbin/in.telnetd log_on_failure += USERID disable = no }
Save and exit the file. Remember we don’t have to do this step on CentOS 7.
Next use the following command to restart the telnet service:
In CentOS 6.x systems:
service xinetd start
Let this service start every time you restart:
On CentOS 6:
chkconfig telnet on chkconfig xinetd on
On CentOS 7:
systemctl start telnet.socket systemctl enable telnet.socket
Let telnet's default port 23 pass through firewalls and routers. To allow the telnet port to pass through the firewall, edit the following file in the CentOS 6.x system:
vi /etc/sysconfig/iptables
Add the following line "-A INPUT -p tcp -m state --state NEW --dport 23 -j ACCEPT":
# Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW --dport 23 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
Save and exit the file. Restart iptables service:
service iptables restart
In CentOS 7, run the following command to allow the telnet service to pass the firewall.
firewall-cmd --permanent --add-port=23/tcp firewall-cmd --reload
That's it. Now the telnet service can be used.
Create a test user, for example, the username is "sk" and the password is "centos":
useradd sk passwd sk
Install telnet package:
yum install telnet
In DEB based systems:
sudo apt-get install telnet
Now, open a terminal and try to access your server (remote host).
If your client is a Linux system, open a terminal and enter the following command to connect to the telnet server.
telnet 192.168.1.150
Enter the username and password created on the server:
Example output:
Trying 192.168.1.150... Connected to 192.168.1.150. Escape character is '^]'. Kernel 3.10.0-123.13.2.el7.x86_64 on an x86_64 server1 login: sk Password: [sk@server1 ~]$
As you can see, the remote host has been successfully accessed locally.
If your system is Windows, go to Start -> Run -> Command Prompt.
In the command prompt, enter the command:
telnet 192.168.1.150
192.168.1.150 is the remote host IP address.
Now you can connect to your server. That's it.
The above is the detailed content of How to install Telnet on CentOS/RHEL Linux 6 & 7. 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

AI Hentai Generator
Generate AI Hentai for free.

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 key differences between CentOS and Ubuntu are: origin (CentOS originates from Red Hat, for enterprises; Ubuntu originates from Debian, for individuals), package management (CentOS uses yum, focusing on stability; Ubuntu uses apt, for high update frequency), support cycle (CentOS provides 10 years of support, Ubuntu provides 5 years of LTS support), community support (CentOS focuses on stability, Ubuntu provides a wide range of tutorials and documents), uses (CentOS is biased towards servers, Ubuntu is suitable for servers and desktops), other differences include installation simplicity (CentOS is thin)

CentOS installation steps: Download the ISO image and burn bootable media; boot and select the installation source; select the language and keyboard layout; configure the network; partition the hard disk; set the system clock; create the root user; select the software package; start the installation; restart and boot from the hard disk after the installation is completed.

CentOS has been discontinued, alternatives include: 1. Rocky Linux (best compatibility); 2. AlmaLinux (compatible with CentOS); 3. Ubuntu Server (configuration required); 4. Red Hat Enterprise Linux (commercial version, paid license); 5. Oracle Linux (compatible with CentOS and RHEL). When migrating, considerations are: compatibility, availability, support, cost, and community support.

How to use Docker Desktop? Docker Desktop is a tool for running Docker containers on local machines. The steps to use include: 1. Install Docker Desktop; 2. Start Docker Desktop; 3. Create Docker image (using Dockerfile); 4. Build Docker image (using docker build); 5. Run Docker container (using docker run).

Docker uses Linux kernel features to provide an efficient and isolated application running environment. Its working principle is as follows: 1. The mirror is used as a read-only template, which contains everything you need to run the application; 2. The Union File System (UnionFS) stacks multiple file systems, only storing the differences, saving space and speeding up; 3. The daemon manages the mirrors and containers, and the client uses them for interaction; 4. Namespaces and cgroups implement container isolation and resource limitations; 5. Multiple network modes support container interconnection. Only by understanding these core concepts can you better utilize Docker.

After CentOS is stopped, users can take the following measures to deal with it: Select a compatible distribution: such as AlmaLinux, Rocky Linux, and CentOS Stream. Migrate to commercial distributions: such as Red Hat Enterprise Linux, Oracle Linux. Upgrade to CentOS 9 Stream: Rolling distribution, providing the latest technology. Select other Linux distributions: such as Ubuntu, Debian. Evaluate other options such as containers, virtual machines, or cloud platforms.

VS Code system requirements: Operating system: Windows 10 and above, macOS 10.12 and above, Linux distribution processor: minimum 1.6 GHz, recommended 2.0 GHz and above memory: minimum 512 MB, recommended 4 GB and above storage space: minimum 250 MB, recommended 1 GB and above other requirements: stable network connection, Xorg/Wayland (Linux)

Docker uses container engines, mirror formats, storage drivers, network models, container orchestration tools, operating system virtualization, and container registry to support its containerization capabilities, providing lightweight, portable and automated application deployment and management.
