IC697BEM761

IC697BEM761

是把一個網絡中使用的IP地址翻譯成能被另一個網絡識別的IP地址。一個網絡被指定為內部網絡，另一個為外部網絡。通常，一個公司把自己的本地內部網絡地址映射到一個或多個全局外部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，因為每個出去和進來的請求都必須經過一個翻譯過程，這是一個認證請求或把它與以前請求匹配的過程。

　　NAT包含在路由器中，通常也是防火墻的一部分。網絡管理員創建一個NAT表，用它來實現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可以靜態定義，也可以根據IP地址池動態進行。

　　NAT的描述詳見RFC 1631。它討論了NAT與CIDR的關系，這是一個解決IP地址耗盡的方法。NAT通過區別公共IP地址和私有IP地址而減少了對公共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。

IC697BEM761

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