Linux Telnet Installation configuration

This article takes the Red Hat 6.2 64-bit version as an example, other Linux similar:

Linux defaults to using the SSH service instead of the Telnet service, so you need to install Telnet manually.

1, Telnet installation package has two, respectively:

telnet-0.17-47.el6.x86_64.rpm

telnet-server-0.17-47.el6.x86_64.rpm

2. Install the Telnet package

RPM–IVH telnet-0.17-47.el6.x86_64.rpm

Install a dependency package before installing the server package: xinetd-2.3.14-33.el6.x86_64.rpm

RPM–IVH xinetd-2.3.14-33.el6.x86_64.rpm

RPM–IVH telnet-server-0.17-47.el6.x86_64.rpm

Then execute:

Rpm-qa|grep Telnet

A message appears indicating successful installation

telnet-0.17-47.el6.x86_64.rpm

telnet-server-0.17-47.el6.x86_64.rpm

3. Configure Telnet

VI Edit/etc/xinetd.d/telnet File

Change Disable = yes to disable = No (service is off by default)

4. Activating Telnet

Execute: Service xinetd Restart (restart Xinted services will automatically start Telnet)

5. Testing

Execution: Telnet 127.0.0.1

A login prompt indicates that the installation configuration was successful.

6. Set the default port

Edit vi/etc/services file Modify telnet default port

Telnet 23/tcp

Telnet 23/UDP

Execution: Service xinetd Restart restart xinted Services activation configuration

7. Restrict Telnet (no attempt, for reference)

Edit/etc/xinetd.d/telnet File

# First set up for the looser restrictions on internal: service Telnet
{

Disable = no <== preset is to activate Telnet service
bind = 210.45.160.17 <== only allow packets to come in through this adapter card
Only_from = 210.45.160.0/24 <== only allows hosts that 210.45.160.0/24 this segment to come online using Telnet service .....

}
# Restrict service Telnet {for external online
Disable = no<== preset is to activate Telnet service
Bind = 192.168.0.1<== only allows packets to come in through this adapter card
Only_from = 192.168.0.0/16<== only allow 192.168.0.0 ~ 192.168.255.255 This segment to come online using Telnet service
Only_from =. edu.cn<== Repeat settings, only education network can be online!

No_access = 192.168.25. {10,26}<== Don't allow these PCs to log in
Access_times = 1:00-9:00 20:00-23:59 <== Only these two hours a day open service ...}

8. Enable Root Login

By default, root is not allowed to log on by Telnet, the following is the method of modification

Vi/etc/pam.d/login

Auth require pam_securetty.so comment out this line

Revision changed to

#auth require pam_securetty.so

Files: http://pan.baidu.com/s/1i3qpp4p