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The Mac firewall and "Ping"

Curious about how safe my system is (MacOS 10.4.10) I tried out the
"Shields up!" port scanner: http://www.grc.com/x/ne.dll?rh1dkyd2
which told me that the "common ports scan" failed because it was
possible to Ping me:

------------------------
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've had a look at the Mac firewall (System
preferences-Sharing-Firewall), but I don't quite understand what I
should enter.
It says that a service which *isn't* selected is blocked by the
firewall, so I assume this means that I have to make a new service (by
pressing the "New..." button) for Ping, then unselect it in the list of
available services.
But what do I enter as the UDP and TCP numbers for "Ping"?

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