IC697CPU731
IC697CPU731由外到內(nèi)的IP包指的是從公網(wǎng)通過NAT發(fā)送到私有網(wǎng)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(nèi)的IP包時,NAT就以IP包的目的IP和目的Port加上包的協(xié)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(wǎng)絡協(xié)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(wǎng)絡協(xié)議棧。
IC697CPU731
IC697CPU731◆ 聯(lián)系人: 陳女士)
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