Virtualbox VM ping duplicate

Having this ping duplicate in VM on Virtualbox

 [root@centos701 ~]# ping 192.168.1.1  
 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.  
 64 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.51 ms  
 64 bytes from 192.168.1.1: icmp_seq=1 ttl=63 time=1.56 ms (DUP!)  
 64 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=18.9 ms  
 64 bytes from 192.168.1.1: icmp_seq=2 ttl=63 time=18.9 ms (DUP!)  
 64 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=1.68 ms  
 64 bytes from 192.168.1.1: icmp_seq=3 ttl=63 time=1.75 ms (DUP!)  

Solution: Disable your host's IP forwarding

 [root@fedora ~]# sysctl -w net.ipv4.ip_forward=0<br />  
 net.ipv4.ip_forward = 0  

Referrence:

http://linuxconfig.org/virtualbox-ping-from-virtual-machine-results-in-dup-duplicate-packages