...
make sure the ntp daemon is installed and enabled:
yum install ntp
Edit /etc/ntp.conf and replace server definitions by
server 172.27.100.16
systemctl start ntpd
systemctl start enable ntpd
Edit /etc/rc.local
ntpdate -s 172.27.100.16
touch /var/lock/subsys/local
Fix permissions
chmod +x /etc/rc.d/rc.local
Edit /etc/sysconfig/network-scripts/ifcfg-eth0Edit
NAME=eth0
TYPE=ethernet
BOOTPROTO=none
DEVICE=eth0
NETMASK=255.255.252.0
IPADDR=172.27.104.4652
DNS1=134.79.111.111
GATEWAY=172.27.104.1
ONBOOT=yes
NM_CONTROLLED=no
IPV4_FAILURE_FATAL=no
IPV6INIT=no
...