IC697CHS771

IC697CHS771

和快速的查找算法。

　　在實現當中，我們選用采用索引查詢的散列表來作為存儲NAT映射表項的數據結構。使用協議類型值、內部網絡地址和端口來計算散列值，并結合映射表項的標志來確定需要做地址翻譯的IP數據包。

　　如果當前的IP數據包是外出的IP數據包，但是沒有匹配到一個合適的映射表項，那么NAT將建立一個新的映射表項，添加到散列表中。

　　如果當前的IP數據包是來自于外部網絡的，要么能夠匹配到一項合適的映射表項，要么目的端口已經被配置為端口轉發（在這種情況下，NAT將依據端口轉發配置，在NAT映射表中靜態添加一個入口），否則，將不會改變這個IP數據包。

　　為了避免已經出現異常的連接繼續占用系統資源，在每個映射表項的定時器超時后，其回掉函數將刪除存儲在散列表中的對應的NAT映射表項。

IC697CHS771◆ 聯系人： 陳女士）
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