Install and configure the telnet Service

Source: Internet
Author: User
Install and configure the telnet service-Linux Enterprise Application-Linux server application information. For more information, see. Author: Wang xiangbaituo

Install telnet

RH9.0 install and start the telnet Service
RH9.0 install and start the telnet service step: by coding
Telnet is divided into two parts
One is a telnet Client
One is the telnet server
First, determine whether the system has installed the telnet client and the server.
Rpm-qa | grep "telnet"
Telnet client rpm package name: telnet-0.17-25.386.rpm (in the first installation disc of RH)
Telnet Server rpm package name: telnet-server-0.17-25.i386.rpm (in the third RH disc)
# Rpm-ivh telnet-0.17-25.386.rpm prompts successful installation
# Rpm-ivh telnet-server-0.17-25.i386.rpm prompts that the service is successfully started:
After telnet-server is successfully installed, a text file for telnet is generated in the/etc/xinetd. d directory. The content is as follows:
# Default: on n # 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 = yes}
Change disable = yes to disable = no in the above file;
Save and exit
# Chkconfig -- list
Xinetd based services:
Chargen-udp: off
Rsync: off
Chargen: off
Daytime-udp: off
Daytime: off
Echo-udp: off
Echo: off
Services: off
Servers: off
Time-udp: off
Time: off
Sgi_fam: on
Telnet: on
Telnet no indicates that the configuration file is successfully modified because it is a service protected by xinetd, so you need to start it using the following methods:
Restart xinetd
# Service xinetd restart
# Nmap Starting nmap V. 3.00 ( Interesting ports on localhost. localdomain ( (The 1595 ports scanned but not shown below are in state: closed) port State Service 22/tcp open ssh 23/tcp open telnet 25/tcp open smtp 111/tcp open sunrpc 1024/tcp open kdm telnet
The service is successfully uninstalled:
Stop the service;
# Rpm-ev telnet-server-0.17-25.i386.rpm
If you are prompted that the telnet-server is successfully uninstalled, you will be prompted to change the name of telnet to telnet. rpmsave to save the settings.


Configure Telnet

1. Check whether the installation package exists:
Rpm-q telnet
Rpm-q telnet-server
2. If not, install:
Rpm-I telnet-server-0.17-25i386.rpm
Note that there may be different versions of TelnetServer.
3. Run ntsysv. ntsysv is the Program for managing services in the system. Select * Before Telnet *.
4. service xinetd restart
5. the Telnet configuration file is in
/Etc/xinetd. d/telnet
You can modify the authorized CIDR Block, domain name, and time range.
6. By default, Telnet does not run the root permission to log on. If necessary, modify:
Vi/etc/pam. d/login
# Auth required #
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