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TCP reset attack
TCP reset attack, also known as "forged TCP resets", "spoofed TCP reset packets" or "TCP reset attacks". These terms refer to a method of tampering with Internet communications. Sometimes, the tampering is malicious; other times, it is beneficial.
== Technical Background ==
The Internet is, in essence, a system for individual computers to exchange electronic messages, or packets of IP data. This system includes hardware to carry the messages (such as copper and fiber optics cables) and a formalized system for formatting the messages, called "protocols". The basic protocol used on the Internet is the IP protocol, which is usually coupled with additional protocols such as TCP (Transmission Control Protocol〔(TCP specification )〕) or UDP (User Datagram Protocol). TCP/IP is the protocol set used for email and web browsing. Each protocol has a block of information, called a header, included near the front of each packet. Headers contain information about which computer sent the packet, which computer should receive it, the packet size, etc.
TCP is used with IP when a two-way virtual connection is required between two computers. (UDP on the other hand is a connectionless IP protocol.)
TCP software on the two machines which will communicate (for example a workstation with a browser and a web server) by exchanging a stream of packets. Using a TCP connection gives the computers an easy way to exchange data items too big for a single packet, such as video clips, email attachments, or music files. Although some web pages are small enough for a single packet, they are sent over TCP connections for convenience.
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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