While performing a "Shields Up" from grc.com test, the only test I failed was the ICMP Echo test (see below). What type of rule can be created to pass this test? "Ping Reply: RECEIVED (FAILED) — Your system REPLIED to our Ping (ICMP Echo) requests, making it visible on the Internet. Most personal firewalls can be configured to block, drop, and ignore such ping requests in order to better hide systems from hackers. This is highly recommended since "Ping" is among the oldest and most common methods used to locate systems prior to further exploitation." I am not using any router and i also checked it through using my mobile internet and still the same problem, obviously it is not the internet problem. Any explanation.