DEVICE=eth0 BOOTPROTO=none ONBOOT=yes USERCTL=no IPV6INIT=no PEERDNS=yes TYPE=Ethernet NETMASK=255.255.255.255 IPADDR=Your-VPS-Main-IP-Address GATEWAY=192.99.21.254 ARP=yes HWADDR=Your-IP-MAC-ADDRESS
2) Add the lines below in your/etc/sysconfig/network-scripts/route-eth0
192.99.21.254 dev eth0 default via 192.99.21.254 dev eth0
3) Add Nameserver in /etc/resolv.conf
nameserver 213.186.33.99
4) Enable network.
ifup eth0