das sagt google dazu:
Zitat:
Smurf Attack
A Smurf Attack occurs when a single packet such as an ICMP echo frame is sent to a group of machines on the Internet with the source address replaced by the target computer or network IP address. This causes a flurry of echo responses to be sent to the target machine, which can overflow the target computer or network. This alert indicates that somebody is attempting to use your network as a smurf amplifier. Broadcasts on the local segment can sometimes trigger false Smurf Attack alerts
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und noch ein guter link mit umfangreicher beschreibung:
http://www.pentics.net/denial-of-ser...pers/smurf.cgi