IC697BEM741

IC697BEM741

是把一個(gè)網(wǎng)絡(luò)中使用的IP地址翻譯成能被另一個(gè)網(wǎng)絡(luò)識(shí)別的IP地址。一個(gè)網(wǎng)絡(luò)被指定為內(nèi)部網(wǎng)絡(luò)，另一個(gè)為外部網(wǎng)絡(luò)。通常，一個(gè)公司把自己的本地內(nèi)部網(wǎng)絡(luò)地址映射到一個(gè)或多個(gè)全局外部IP地址，并把收到的包中的全局IP地址解釋成本地IP地址。這也有助于安全，因?yàn)槊總€(gè)出去和進(jìn)來(lái)的請(qǐng)求都必須經(jīng)過(guò)一個(gè)翻譯過(guò)程，這是一個(gè)認(rèn)證請(qǐng)求或把它與以前請(qǐng)求匹配的過(guò)程。

　　NAT包含在路由器中，通常也是防火墻的一部分。網(wǎng)絡(luò)管理員創(chuàng)建一個(gè)NAT表，用它來(lái)實(shí)現(xiàn)全局到本地和本地到全局地址的映射。NAT也可以和策略利用路由一起使用。NAT可以靜態(tài)定義，也可以根據(jù)IP地址池動(dòng)態(tài)進(jìn)行。

　　NAT的描述詳見(jiàn)RFC 1631。它討論了NAT與CIDR的關(guān)系，這是一個(gè)解決IP地址耗盡的方法。NAT通過(guò)區(qū)別公共IP地址和私有IP地址而減少了對(duì)公共IP地址的需求。CIDR把公共IP地址聚集在一起，減少了IP地址的浪費(fèi)。

IC697BEM741

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