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smurf attack
The Smurf Attack is a distributed denial-of-service attack in which large numbers of Internet Control Message Protocol (ICMP) packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP Broadcast address. Most devices on a network will, by default, respond to this by sending a reply to the source IP address. If the number of machines on the network that receive and respond to these packets is very large, the victim's computer will be flooded with traffic. This can slow down the victim's computer to the point where it becomes impossible to work on.
==History==
In the late 1990s, many IP networks would participate in Smurf attacks if prompted (that is, they would respond to ICMP requests sent to broadcast addresses). Today, administrators can make a network immune to such abuse, therefore very few networks remain vulnerable to Smurf attacks.〔For example, (netscan.org (Web Archive) ) showed 122,945 broken networks as of Jan 25, 1999, but only 2,417 as of Jan 06, 2005.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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