NTP server configuration peer to peer connection.

 

This is the NTP peer to peer connection steps:

if we have 3 NTP servers all three are interconnect to each other and  they are syncing from the internet, Here are the steps of the connection.



[root@test ~]# cat /etc/ntp.conf
# For more information about this file, see the man pages
# ntp.conf(5), ntp_acc(5), ntp_auth(5), ntp_clock(5), ntp_misc(5), ntp_mon(5).

driftfile /var/lib/ntp/drift

# Permit time synchronization with our time source, but do not
# permit the source to query or modify the service on this system.
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery

# Permit all access over the loopback interface. This could
# be tightened as well, but to do so would effect some of
# the administrative functions.
restrict 127.0.0.1
restrict -6 ::1

# Hosts on local network are less restricted.
#The subnets we want to be sink from the NTP server
restrict 10.90.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.32.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.43.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.34.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.193.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.46.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.45.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.33.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.17.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.16.0.0 mask 255.255.255.0 nomodify notrap
restrict 10.35.0.0 mask 255.255.255.0 nomodify notrap

# Use public servers from the pool.ntp.org project.
# Please consider joining the pool (http://www.pool.ntp.org/join.html).
#server 0.rhel.pool.ntp.org iburst
#server 1.rhel.pool.ntp.org iburst
#server 2.rhel.pool.ntp.org iburst
#server 3.rhel.pool.ntp.org iburst

#time zones or pools
server 0.us.pool.ntp.org
server 0.north-america.pool.ntp.org
server 0.south-america.pool.ntp.org
server 1.br.pool.ntp.org

#peer server names
peer 10.90.16.9
peer 10.90.16.10
Peer 10.90.16.11

#broadcast 192.168.1.255 autokey # broadcast server
#broadcastclient # broadcast client
#broadcast 224.0.1.1 autokey # multicast server
#multicastclient 224.0.1.1 # multicast client
#manycastserver 239.255.254.254 # manycast server
#manycastclient 239.255.254.254 autokey # manycast client

# Enable public key cryptography.
#crypto

includefile /etc/ntp/crypto/pw

# Key file containing the keys and key identifiers used when operating
# with symmetric key cryptography.
keys /etc/ntp/keys

# Specify the key identifiers which are trusted.
#trustedkey 4 8 42

# Specify the key identifier to use with the ntpdc utility.
#requestkey 8

# Specify the key identifier to use with the ntpq utility.
#controlkey 8

# Enable writing of statistics records.
#statistics clockstats cryptostats loopstats peerstats

logfile /var/log/ntp.log

Save the File and Exit.


Step-2
From client side

/etc/ntp.conf--: go to the bottom  and give the NTP server name and address as below

server  xx.xx.xx.xx
server xx.xx.xx.xx
server xx.xx.xx.xx
 save and exit