Quick way to configure telnet service.

2.    Now to start the telnet service even after reboot execute one of the  below task.
a.    vi /etc/xinetd.d/telnet
make disable=no
b.    chkconfig xinetd on
3.    Restart the telnet service.

[root@kalwa1 ~]# service xinetd restart
Stopping xinetd:                                           [  OK  ]
Starting xinetd:                                           [  OK  ]
[root@kalwa1 ~]#

Now your telnet server is running.

4.    Now perform a double check use following command.

[root@kalwa1 xinetd.d]# lsof -i:23
COMMAND  PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
xinetd  3113 root    5u  IPv6  15482      0t0  TCP *:telnet (LISTEN)
[root@kalwa1 xinetd.d]#

You can see that word Listen at the end which is important.