Ping an IP address from same subnet and get response from my own IP address,why?

hi: i am trying to install openfiler on VMwork station, and my IP is "192.168.2.114", i set my openfiler IP as "192.168.2.123" (which is available) but when i ping it , i got reply from "192.168.2.114" saying destination-host-unreachable. why is that?