IC697CHS783

IC697CHS783

和快速的查找算法。

　　在實(shí)現(xiàn)當(dāng)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(xiàng)的數(shù)據(jù)結(jié)構(gòu)。使用協(xié)議類型值、內(nèi)部網(wǎng)絡(luò)地址和端口來計(jì)算散列值，并結(jié)合映射表項(xiàng)的標(biāo)志來確定需要做地址翻譯的IP數(shù)據(jù)包。

　　如果當(dāng)前的IP數(shù)據(jù)包是外出的IP數(shù)據(jù)包，但是沒有匹配到一個合適的映射表項(xiàng)，那么NAT將建立一個新的映射表項(xiàng)，添加到散列表中。

　　如果當(dāng)前的IP數(shù)據(jù)包是來自于外部網(wǎng)絡(luò)的，要么能夠匹配到一項(xiàng)合適的映射表項(xiàng)，要么目的端口已經(jīng)被配置為端口轉(zhuǎn)發(fā)（在這種情況下，NAT將依據(jù)端口轉(zhuǎn)發(fā)配置，在NAT映射表中靜態(tài)添加一個入口），否則，將不會改變這個IP數(shù)據(jù)包。

　　為了避免已經(jīng)出現(xiàn)異常的連接繼續(xù)占用系統(tǒng)資源，在每個映射表項(xiàng)的定時器超時后，其回掉函數(shù)將刪除存儲在散列表中的對應(yīng)的NAT映射表項(xiàng)。

IC697CHS783◆ 聯(lián)系人： 陳女士）
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