Unable to Ping ESXI 5.5 Host

while i am continue working on my  Lab and configure ESXI i faced another problem and took 2 days to solve it maybe someone faced this issue but this will help other people as well.

The problem description like this :- after assigned IP to the server i want like normal people connect to this server using my laptop but simply when trying to ping :-

“Detestation unreachable” 

I thought at first it was my network card issue and maybe it’s not supported By ESXI, But this is not valid option because the weirdest part in this issue was when restart the server and ESXI loading the services i was able to ping without any problem then the message appeared again.

as you see from the above screenshoot ping then not ping !!!!!
The solution very simple i start missing with BIOS options and found new option there called “Network Stack” all you have to do is enable this option and link to IPV4.
Cheers
Osama Mustafa