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In network computing, hairpinning describes a communication between two hosts behind the same NAT device using their mapped endpoint. Because not all NAT devices support this communication configuration, applications must be aware of it. ==Example== Let us consider a private network with the following: *Gateway address: 192.168.0.1 *Host 1: 192.168.0.5 *Host 2: 192.168.0.7 *The gateway has an external IP : 192.0.2.1 *Host 1 runs a P2P application P1 on its port 12345 which is externally mapped to 4444. *Host 2 runs a P2P application P2 on its port 12345 which is externally mapped to 5555. If the NAT device supports hairpinning, then P1 application can connect to the P2 application using the external endpoint 192.0.2.1:5555. If not, the communication will not work. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hairpinning」の詳細全文を読む スポンサード リンク
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