The new stealth mode in Tiger is just this ipfw command
ipfw -q add 20000 deny icmp from any to me in icmptypes 8
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Does this essentially make your Mac invisible by not responding to ANYTHING you didn’t originate?
From the System Preferences, Apple states “Ensure that any uninvited traffic received no response – not even an acknowledgement that your computer exists.”. However, it seems to me that the stealth mode only denies type 8 of ICMP traffic(ping).