Telnet Server And Client Config
Telnet server is used to login into another system. You can use the telnet command to log in remotely to another system on your network. The system can be on your local area network or available through an Internet connection.Telnet operates as if you were logging in to another system from a remote terminal. You will be asked for a login name and password. In effect, you are logging in to another account on another system. In fact, if you have an account on another system, you could use Telnet to log in to it.
Configurations Files
1. /etc/xinetd.d/telnet - Main Configuration File.
2. /etc/securetty - Contains list of the consoles allow to access for users to used log in remotely to another system.
3. /etc/hosts - Contains list of IP address allow to access telnet session from another systems.
Configuring Telnet Server.
[root@server1 ~]# yum install telnet* …….
Loaded plugins: refresh-packagekit, rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
Server | 1.3 kB 00:00
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet.i686 1:0.17-46.el6 set to be updated
---> Package telnet-server.i686 1:0.17-46.el6 set to be updated
--> Processing Dependency: xinetd for package: 1:telnet-server-0.17-46.el6.i686
--> Running transaction check
---> Package xinetd.i686 2:2.3.14-29.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
===========================================================================
Package Arch Version Repository Size
===========================================================================
Installing:
telnet i686 1:0.17-46.el6 Server 56 k
telnet-server i686 1:0.17-46.el6 Server 36 k
Installing for dependencies:
xinetd i686 2:2.3.14-29.el6 Server 121 k
Transaction Summary
===========================================================================
Install 3 Package(s)
Upgrade 0 Package(s)
Total download size: 213 k
Installed size: 409 k
Is this ok [y/N]: y
Downloading Packages:
(1/3): telnet-0.17-46.el6.i686.rpm | 56 kB 00:00
(2/3): telnet-server-0.17-46.el6.i686.rpm | 36 kB 00:00
(3/3): xinetd-2.3.14-29.el6.i686.rpm | 121 kB 00:00
-----------------------------------------------------------------------------------------------------------------------------
Total 5.2 MB/s | 213 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 2:xinetd-2.3.14-29.el6.i686 1/3
Installing : 1:telnet-server-0.17-46.el6.i686 2/3
Installing : 1:telnet-0.17-46.el6.i686 3/3
Installed:
telnet.i686 1:0.17-46.el6 telnet-server.i686 1:0.17-46.el6
Dependency Installed:
xinetd.i686 2:2.3.14-29.el6
Complete!
[root@server1 ~]#vi /etc/xinetd.d/telnet …….
# 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 = yes
}
# 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
}
:wq! …….
[root@server1 ~]# vi /etc/securetty …….
console
vc/1
vc/2
vc/3
vc/4
vc/5
vc/6
vc/7
vc/8
vc/9
vc/10
vc/11
tty1
tty2
tty3
tty4
tty5
tty6
tty7
tty8
tty9
tty10
tty11
console
vc/1
vc/2
vc/3
vc/4
vc/5
vc/6
vc/7
vc/8
vc/9
vc/10
vc/11
tty1
tty2
tty3
tty4
tty5
tty6
tty7
tty8
tty9
tty10
tty11
pts/0
pts/1
pts/2
:wq! …….
[root@server1 ~]#vi /etc/hosts …….
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
200.0.0.1
200.0.0.100
:wq! …….
[root@server1 ~]# service xinetd restart …….
Stopping xinetd: [FAILED]
Starting xinetd: [ OK ]
[root@server1 ~]# chkconfig --level 35 xinetd on …….
Configuring Telnet Client.
[root@client ~]# yum install telnet …….
Loaded plugins: refresh-packagekit, rhnplugin
This system is not registered with RHN.
RHN support will be disabled.
Client | 1.3 kB 00:00
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package telnet.i686 1:0.17-46.el6 set to be updated
--> Finished Dependency Resolution
Dependencies Resolved
===========================================================================
Package Arch Version Repository Size
===========================================================================
Installing:
telnet i686 1:0.17-46.el6 Client 56 k
Transaction Summary
===========================================================================
Install 1 Package(s)
Upgrade 0 Package(s)
Total download size: 56 k
Installed size: 102 k
Is this ok [y/N]: y
Downloading Packages:
telnet-0.17-46.el6.i686.rpm | 56 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : 1:telnet-0.17-46.el6.i686 1/1
Installed:
telnet.i686 1:0.17-46.el6
Complete!
[root@client Desktop]# telnet 200.0.0.1 …….
Trying 200.0.0.1...
Connected to 200.0.0.1.
Escape character is '^]'.
Red Hat Enterprise Linux Server release 6.0 (Santiago)
Kernel 2.6.32-71.el6.i686 on an i686
login: root …….
Password: * * * * * …….
Last login: Sat May 20 20:32:31 on pts/2
[root@server1 ~]# ll …….
total 112
drwxr-xr-x. 11 root root 4096 May 20 21:19 1
-rw-------. 1 root root 1500 Jan 1 2013 anaconda-ks.cfg
drwxr-xr-x. 2 root root 4096 May 20 20:46 Desktop
drwxr-xr-x. 2 root root 4096 May 22 2011 Documents
drwxr-xr-x. 2 root root 4096 May 22 2011 Downloads
-rw-r--r--. 1 root root 45367 Jan 1 2013 install.log
-rw-r--r--. 1 root root 10565 Jan 1 2013 install.log.syslog
drwxr-xr-x. 2 root root 4096 May 22 2011 Music
-rw-r--r-- 1 root root 21 May 20 22:33 new1
drwxr-xr-x. 2 root root 4096 May 22 2011 Pictures
drwxr-xr-x. 2 root root 4096 May 22 2011 Public
drwxr-xr-x. 2 root root 4096 May 22 2011 Templates
drwxr-xr-x. 2 root root 4096 May 22 2011 Videos
-rw-r--r-- 1 root root 0 May 20 2000 welcome
[root@server1 ~]# rm-rf welcome …….
[root@server1 ~]# ll …….
drwxr-xr-x. 11 root root 4096 May 20 21:19 1
-rw-------. 1 root root 1500 Jan 1 2013 anaconda-ks.cfg
drwxr-xr-x. 2 root root 4096 May 20 20:46 Desktop
drwxr-xr-x. 2 root root 4096 May 22 2011 Documents
drwxr-xr-x. 2 root root 4096 May 22 2011 Downloads
-rw-r--r--. 1 root root 45367 Jan 1 2013 install.log
-rw-r--r--. 1 root root 10565 Jan 1 2013 install.log.syslog
drwxr-xr-x. 2 root root 4096 May 22 2011 Music
-rw-r--r-- 1 root root 21 May 20 22:33 new1
drwxr-xr-x. 2 root root 4096 May 22 2011 Pictures
drwxr-xr-x. 2 root root 4096 May 22 2011 Public
drwxr-xr-x. 2 root root 4096 May 22 2011 Templates
drwxr-xr-x. 2 root root 4096 May 22 2011 Videos
[root@server1 ~]#cat > new …….
Welcome to ITTables …….
CTRL+D …….
[root@server1 ~]#ll …….
drwxr-xr-x. 11 root root 4096 May 20 21:19 1
-rw-------. 1 root root 1500 Jan 1 2013 anaconda-ks.cfg
drwxr-xr-x. 2 root root 4096 May 20 20:46 Desktop
drwxr-xr-x. 2 root root 4096 May 22 2011 Documents
drwxr-xr-x. 2 root root 4096 May 22 2011 Downloads
-rw-r--r--. 1 root root 45367 Jan 1 2013 install.log
-rw-r--r--. 1 root root 10565 Jan 1 2013 install.log.syslog
drwxr-xr-x. 2 root root 4096 May 22 2011 Music
-rw-r--r-- 1 root root 21 May 20 22:33 new1
drwxr-xr-x. 2 root root 4096 May 22 2011 Pictures
drwxr-xr-x. 2 root root 4096 May 22 2011 Public
drwxr-xr-x. 2 root root 4096 May 22 2011 Templates
drwxr-xr-x. 2 root root 4096 May 22 2011 Videos
-rw-r--r-- 1 root root 0 May 20 2000 welcome
[root@server1 ~]# exit …….
Logout
Connection closed by foreign host.
[root@client ~]# telnet 200.0.0.1 …….
Trying 200.0.0.1...
Connected to 200.0.0.1.
Escape character is '^]'.
Red Hat Enterprise Linux Server release 6.0 (Santiago)
Kernel 2.6.32-71.el6.i686 on an i686
login: user1 …….
Password:***** …….
Last login: Sat May 20 23:08:34 from 200.0.0.2
[user1@server1 ~]$
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