Linux system telnet service settings (1)

For Linux systems, let's talk about the telnet service. In Linux, we will explain the telnet settings for different versions and related issues. For details, refer to the text.

I. Basic telnet knowledge

Telnet: provides the telnet service. unencrypted user/password groups are used for verification and attached to the xinetd service. The file is located in/etc/xinetd. d/telnet.

Krb5-telnet: Provides telnet service, allows normal telnet login, default is not allow root user login, use os5 authentication, attached to the xinetd service. The file is located in/etc/xinetd. d/krb5-telnet.

Ekrb5-telnet: provides encrypted telnet service, but must require ekrb5's encrypted server. The file is located in/etc/xinetd. d/ekrb5-telnet.

Xinetd: Internet operation service program. it provides functions similar to inetd + tcp_wrapper, but it is more robust and secure. It monitors the network's requirements for various services managed by it and starts the corresponding service programs as needed. the file is located in/etc/xinetd. d.

Ii. Install the telnet Service

1. view the telnet rpm package

 
 

  
  
[root@rhel52 /]# rpm -qa | grep telnet  
  
  
telnet-0.17-38.el5  
  
  
telnet-server-0.17-38.el5       《=RHEL5CD#4  
  
  
[root@rhel52 /]# 
 
 

2. Install the telnet server rpm package

 
 

  
  
[root@rhel52 work]# rpm -ivh telnet-server-0.17-38.el5.i386.rpm  
  
  
warning: telnet-server-0.17-38.el5.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186  
  
  
Preparing...                ########################################### [100%]  
  
  
package telnet-server-0.17-38.el5 is already installed  
  
  
[root@rhel52 work]# 
 
 

Note: After installation, a telnet configuration file will appear in/etc/xinetd. d /.