In other words, it only costs the attacker one packet to cause thousands of packets to be sent to the victim. See smurf for more information. This is sometimes triggered by people sending out broadcasts on the local segment. This is commonly seen by people inside corporate networks or on cable-modem segments. While this doesn't indicate an attempt to use your network as an amplifier, it does indicate that somebody is attempting discovery operations on your network.
Defense See smurf amplifier defense .
The subnet mask used when checking an IP address for a Smurf attack.