【正文】 目 錄一、前言 ....................................................................................................................................1二、網(wǎng)絡(luò)安全 ............................................................................................................................1（一） 、網(wǎng)絡(luò)安全概述 ..................................................................................................................1定義 ......................................................................................................................................1網(wǎng)絡(luò)安全特性 ......................................................................................................................2安全隱患 ..............................................................................................................................2（二） 、確保網(wǎng)絡(luò)安全的主要技術(shù) ..............................................................................................3物理安全措施 ......................................................................................................................3數(shù)據(jù)傳輸安全技術(shù) ..............................................................................................................3防火墻技術(shù) ..........................................................................................................................4入侵檢測技術(shù) ......................................................................................................................4審計技術(shù) ..............................................................................................................................4安全性檢測技術(shù) ..................................................................................................................4防病毒技術(shù) ..........................................................................................................................4備份技術(shù) ..............................................................................................................................5終端安全技術(shù) ......................................................................................................................5訪問控制技術(shù) ....................................................................................................................5三、防火墻技術(shù) ........................................................................................................................6（一） 、防火墻概述 ......................................................................................................................6（二） 、防火墻的體系結(jié)構(gòu) ..........................................................................................................6雙宿主主機體系結(jié)構(gòu) ..........................................................................................................7屏蔽主機體系結(jié)構(gòu) ..............................................................................................................7屏蔽子網(wǎng)體系結(jié)構(gòu) ..............................................................................................................8（三） 、防火墻的分類 ..................................................................................................................9包過濾型 ..............................................................................................................................9網(wǎng)絡(luò)地址轉(zhuǎn)化NAT ............................................................................................................10代理型 ................................................................................................................................10監(jiān)測型 ................................................................................................................................11四、防火墻示例 ......................................................................................................................11（一） 、VPN 技術(shù)簡介 .................................................................................................................12（二） 、具體配置 ........................................................................................................................13通道的配置 ............................................................................................................................13VPN 的配置 .............................................................................................................................16VPN 客戶端的配置 .................................................................................................................22VPN 客戶端的使用方法 .........................................................................................................26配置文件的應(yīng)用 ....................................................................................................................27五、防火墻技術(shù)發(fā)展的趨勢 ..................................................................................................28總結(jié)： ......................................................................................................................................30致 謝： ......................................................................................................................................31參考文獻： ..............................................................................................................................311 防火墻與 VPN 結(jié)合的網(wǎng)絡(luò)安全研究【摘要】本文就 INTERNET 的安全隱患，闡述了網(wǎng)絡(luò)安全技術(shù)的重要性，列舉了當前幾大網(wǎng)絡(luò)安全技術(shù)，然后重點介紹了防火墻技術(shù)。其中，涉及到防火墻的體系結(jié)構(gòu)，論述了防火墻的分類及其主要技術(shù)特征、優(yōu)缺點。同時，介紹了 VPN 技術(shù)。最后，以 NETSCREEN50防火墻為例，對其 VPN 配置進行簡單介紹。【