Edit ifcfg file
vi /etc/sysconfig/network-scripts/ifcfg-eth0
Add this
TYPE=Ethernet BOOTPROTO=static DEFROUTE=yes PEERDNS=yes PEERROUTES=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME=eth0 UUID=62f47c6d-cf65-409f-bbd6-696db494d74c DEVICE=eth0 ONBOOT=yes IPADDR=73.123.136.53 NETMASK=255.255.255.248 GATEWAY=73.123.136.49 DNS1=8.8.8.8 DNS2=8.8.4.4
And then run command
service network restart ping google.com