Telnet Remote Terminal commands and Installation

Source: Internet
Author: User

0. Introduction:

Telnet is a remote connection protocol.

Run the "Telnet IP port" command to connect to the remote host of the specified IP address and port.

If you want to directly run the Telnet command without parameters, enter the command mode, and then run the 'open IP port "command

Run help to view the command Moderator, and display to view the escape settings. The ^ in "^]" indicates the ctrl key.

After the host is connected, press Ctrl and] to enter the command mode of the Telnet client.

1. Check whether telnet is installed.

[Root @ localhost ~] # Rpm-Q TelnetOr[Root @ localhost ~]# Rpm-Q telnet-Client
[Root @ localhost ~] # Rpm-Q telnet-Server

2. Telnet Installation

Windows:

Run --> control panel -->Program--> Enable or disable Windows functions --> select "Telnet Server/telnet client" --> OK to start Installation

Linux:

Telnet client:

[Root @ localhost ~] # Yum install telnet-y

The following are references:

How to Set Telnet in Linux
Telnet settings in Linux
To configure the telnet service, follow these steps:
1. Install the Telnet package (usually two)
1. telnet-client (or telnet). This package provides the Telnet client program;
2. telnet-server. This package provides telnet server programs;

Check whether these software packages are installed before installation. The method is as follows:
[Root@linuxso.com root] # rpm-Q telnet or [root @ wljs root] # rpm-Q telnet-Client
[Root@linuxso.com root] # rpm-Q telnet-Server

If no software package is detected, install it. By default, the Telnet software package is installed in Red Hat Linux 9. Generally, you only need to install the telnet-server software package.
1. Get the Telnet-server-0.17-25.i386.rpm package from installation disk 3 of Red Hat Linux 9.
2. install the software package
[Root@linuxso.com root] # rpm-I Telnet-server-0.17-25.i386.rpm

Ii. Start the Telnet Service
1. Start the service
Method 1: Use ntsysv to add * Before Telnet in the displayed window, and then press OK.
Method 2: edit/etc/xinetd. d/telnet
[Root@linuxso.com root] # vi/etc/xinetd. d/telnet
Find disable = yes and change Yes to No.

2. Activate the service
[Root@linuxso.com root] # service xinetd restart

Iii. Test services
[Root@linuxso.com root] # telnet IP (or hostname)
If the configuration is correct, the system prompts you to enter the user name and password of the remote machine.
Login:
Password:
Note: Only common users are allowed by default.

4. Set the telnet port
# Vi/etc/services
Go to edit mode and find telnet (input/telnet in VI editing mode)
The following content is found:
Telnet 23/tcp
Telnet 23/udp
Modify 23 to an unused port number (for example, 2000), exit VI, restart the telnet service, and modify the default port number for telnet.

V. Telnet service restrictions
Telnet is a plaintext transmission password and data. If you are not satisfied with the default settings, You need to restrict the service scope. If the IP address of your host is 210.45.160.17, you can set it as follows.
# Vi/etc/xinetd. d/telnet
Service telnet
{
Disable = No # activate the telnet service, no
Bind = 210.45.160.17 # Your IP
Only_from = 210.45.0.0/16 # Only 210.45.0.0 ~ is allowed ~ 210.45.255.255
Only_from = .edu.cn # Only CERNET can access!
No_access = 210.45.160. # these two IP addresses cannot be logged on.
Access_times =--# The service is only available for these two periods of time every day.
......
}

Vi. login from telnet Root User
Telnet is not safe. By default, the root user is not allowed to use Telnet to access the Linux host. To allow the root user to log on, use the following methods:
[Root @ echo/root] # vi/etc/PAM. d/login
# Auth required pam_securetty.so # Add comments to this line!
Or
[Root@linuxso.com root] # mv/etc/securetty. bakhttp: // www.linuxso.com/command/telnet.html

Reference Path:

Http://www.linuxso.com/command/telnet.html

Http://www.ehowstuff.com/how-to-install-telnet-client-on-centos-6-3/

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