NTP server : Network time protocol Port : 123

NTP server : Network time protocol Port : 123

OR remote time server

NTP server is used to set same time on client machines. Manually it is not possible to configure same time on multiple machine.
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***** server configuration *******

1># yum install ntpdate

2># vim /etc/ntp.conf

Disable the line by putting hash mark "#"

#restrict -6 default kod nomodify notrap nopeer noquery  -----disable IPv6
#restrict -6 ::1

disable old default/redhat entry.
# server 0.rhel.pool.ntp.org
# server 1.rhel.pool.ntp.org
# server 2.rhel.pool.ntp.org

add new server entry.
server 192.168.122.10 ibrust ==========> parameter used to sync time fastly ibrust.
server 127.127.1.0

#keys /etc/ntp/keys -----------> disable key authentication.

:wq


3># /etc/init.d/ntpd restart

4># chkconfig ntpd on

5># iptables -F

6># service iptables save
 
******************client configuration.************************
1> # system-config-date

-> date and time tab
synchronize date and time over the network
-> delete existing old server entry and add new one
-> add button 192.168.122.10 press enter
-> OK
=> advance options
speed up initial synchronisation.
-> OK

[ It will take few moments to fetch time ]


2># /etc/init.d/ntpd restart

3># chkconfig ntpd on

Extra : you can recheck the available ntp connection

#ntpq -p

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