IC697CPM790

IC697CPM790由外到內的IP包指的是從公網通過NAT發送到私有網絡的IP包。它的源IP是公共IP，目的IP是NAT的公共IP。當截獲到一個由外到內的IP包時，NAT就以IP包的目的IP和目的Port加上包的協議類型作為NAT映射表項的匹配查詢條件進行搜索。如果找到一個對應的表項，就用表項的Real Src IP和Real Src Port來替換IP包的目的IP和目的Port，而保持IP包的源IP和源Port不變。然后，重新計算TCP或UDP的校驗和，再計算IP頭的校驗和，后把IP包重新歸還給VxWorks的網絡協議棧。如果在映射表中沒有搜索到對應的表項，則對IP包不作任何處理，直接歸還給VxWorks網絡協議棧。

IC697CPM790

IC697CPM790◆ 聯系人： 陳女士）
◆ 電話：0592-5709825
◆ 聯系手機：18030229053
◆ QQ: 2479261344
◆ 傳真：0592-5709828（備注“陳女生”收）
◆ E-mail： 2479261344@qq.comHP Jetdirect EX Plus3

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