I install SP2 on my personnel computer at job for testing and to set up a group policy for the firewall and I found a bug. I would like to know if you guy have the same one. I have set the “File and Printer Sharing” to only accept incoming from a specific IP address. The problem is that whenever I put this rules on, my machine can be ping from all IP.

On the group policy editor, their a note
Note: If any policy setting opens TCP port 445, Windows Firewall allows inbound ICMP echo requests (the message sent by the Ping utility), even if the "Windows Firewall: Allow ICMP exceptions" policy setting would block them. Policy settings that can open TCP port 445 include "Windows Firewall: Allow file and printer sharing exception," "Windows Firewall: Allow remote administration exception," and "Windows Firewall: Define port exceptions."
To my understanding, when I open the “File and Printer Sharing”, it’s open the ping also but why does it open ping for everyone and not only the IP I specified?

Bug or not?