Cannot send ping request from server-client and vice versa

Question

i had install windows server 2012 r2 in a virtual box
and also installed windows 7 in same virutual box
i configued my client DNS as my server IP address
ex:
server-ip- a.b.c.d client-dns - a.b.c.d
both system has different class c ip address and
same default gateway
In server DNS i configued as blank ( . . . )
then why i can't ping my server and client

Answer 1

Solved by adding NAT network in a virtual Box network setting
steps:
In virtual box preferences create a new network..
in both machine's network setting add to the NAT netowork..
Then the both machines will communicate..