Shulou(Shulou.com)06/01 Report--

CentOS system how to install Telnet, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can gain something.

What is Telnet?

Telnet is a protocol used to remotely log in to a computer 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 tutorial, we will show you how to install Telnet and how to access remote systems through Telnet.

Installation

Open the terminal and enter the following command to install telnet:

The code is as follows:

Yum install telnet telnet-server-y

Now telnet is installed on your server. Next, edit the file / etc/xinetd.d/telnet:

The code is as follows:

Vi / etc/xinetd.d/telnet

Set disable = no:

The code is as follows:

# 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 in CentOS 7.

Next, restart the telnet service using the following command:

In CentOS 6.x systems:

The code is as follows:

Service xinetd start

Let the service start every time it is restarted:

On CentOS 6:

The code is as follows:

Chkconfig telnet on

Chkconfig xinetd on

On CentOS 7:

The code is as follows:

Systemctl start telnet.socket

Systemctl enable telnet.socket

Allow the default port 23 of telnet to pass through the firewall and router. To make the telnet port accessible through the firewall, edit the following file on the CentOS 6.x system:

The code is as follows:

Vi / etc/sysconfig/iptables

Add the following line "- An INPUT-p tcp-m state-- state NEW-- dport 23-j ACCEPT":

The code is as follows:

# 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]

-An INPUT-m state-- state ESTABLISHED,RELATED-j ACCEPT

-An INPUT-p icmp-j ACCEPT

-An INPUT-I lo-j ACCEPT

-An INPUT-p tcp-m state-- state NEW-- dport 23-j ACCEPT

-An INPUT-m state-- state NEW-m tcp-p tcp-- dport 22-j ACCEPT

-An INPUT-j REJECT-- reject-with icmp-host-prohibited

-A FORWARD-j REJECT-- reject-with icmp-host-prohibited

COMMIT

Save and exit the file. Restart the iptables service:

The code is as follows:

Service iptables restart

In CentOS 7, run the following command to allow the telnet service to pass through the firewall.

The code is as follows:

Firewall-cmd-permanent-add-port=23/tcp

Firewall-cmd-reload

okay. The telnet service is now available for use.

Create a user

Create a test user, such as the user name "sk" and the password "centos":

The code is as follows:

Useradd sk

Passwd sk

Client configuration

Install the telnet package:

The code is as follows:

Yum install telnet

In DEB-based systems:

The code is as follows:

Sudo apt-get install telnet

Now, open the terminal and try to access your server (remote host).

If your client is a Linux system, open the terminal and enter the following command to connect to the telnet server.

The code is as follows:

Telnet 192.168.1.150

Enter the username and password that has been created on the server:

Sample output:

The code is as follows:

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 x861464

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.

At the command prompt, enter the command:

The code is as follows:

Telnet 192.168.1.150

192.168.1.150 is the remote host IP address.

Is it helpful for you to read the above content? If you want to know more about the relevant knowledge or read more related articles, please follow the industry information channel, thank you for your support.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.