[Switched2Mac]

I have turned the firewall on. And no services are enabled.

Yet I can still ping my OSX PB 12" from my PC!!!

I thought even ICMP was blocked.

What gives?!?!

[Don Pickett]

Apparently not. . .

Now, to be helpful: the built-in firewall is very, very basic. If you want more complete control, you can learn about configuring OS X's built-in firewall (type "man ipfw" in the Terminal) use Brickhouse to configure ipfw graphically, or use a third party solution like Firewalk.

[NeXTLoop]

The default configuration of OS X's firewall has never blocked ICMP. Go to Symantec.com and use their security check. You'll see that ICMP is the only port open.

[Millennium]

The built-in firewall for OSX is actually quite powerful. Unfortunately, the GUI they provided for it is not.

Don Picket suggested controlling ipfw (the firewall) from the Terminal. You can do this, but if you prefer a GUI, what you need is a program called BrickHouse. This provides a much more powerful interface to the firewall, which should fulfill most of your firewall needs.