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  3. 學習啦>學習電腦>網絡知識>網絡基礎知識>《硬件防火墻的原理是什么》正文

    硬件防火墻的原理是什么

    時間:2015-10-12 12:31:23本文內容及圖片來源于讀者投稿,如有侵權請聯系xuexila888@qq.com 孫勝龍 我要投稿

      相信現在每個家庭都有電腦吧!大家都喜歡用電腦玩游戲,看電影,聊QQ等等吧!那么你知道電腦本身會自帶防火墻嗎?說起電腦防火墻令我想起小學時無知的我,有天有個很要好的男同學問我:你幾時開始玩電腦,我用鄙視的眼光對男同學回答:比你早!男同學又問:知道電腦有防火墻嗎?防火墻與硬件防火墻是一個意思嗎?這時我無語了!學習啦小編來告訴大家硬件防火墻是什么。

      硬件防火墻是由硬件執行的一些功能,主要是是指把防火墻程序做到芯片里面能減少CPU的負擔,使路由更穩定。 保障內部網絡安全的一道重要屏障。一般的軟件安全廠商所提供的硬件防火墻便是在硬件服務器廠商定制硬件,然后再把linux系統與自己的軟件系統嵌入。(Symantec的SGS便是DELL+Symantec的軟件防火墻)這樣做的好處是linux相對Windows的server相對安全。這樣做的理由是由于ISA必須裝在Windows操作系統下,微軟的操作系統相對不安全,本身安全存在隱患的系統上部署安全策略相當于處在亞安全狀態,是不可靠的。在兼容性方面也是硬件防火墻更勝一籌,其實軟件防火墻與硬件防火墻的主要區別就在于硬件。

    硬件防火墻的原理是什么

      基本原理

      至于價格高,原因在于,軟件防火墻只有包過濾的功能,硬件防火墻中可能還有除軟件防火墻以外的其他功能,例如CF(內容過濾)IDS(入侵偵測)IPS(入侵防護)以及等等的功能。

      也就是說硬件防火墻是指把防火墻程序做到芯片里面,由硬件執行這些功能,能減少CPU的負擔,使路由更穩定。

      硬件防火墻是保障內部網絡安全的一道重要屏障。它的安全和穩定,直接關系到整個內部網絡的安全。因此,日常例行的檢查對于保證硬件防火墻的安全是非常重要的。

      系統中存在的很多隱患和故障在暴發前都會出現這樣或那樣的苗頭,例行檢查的任務就是要發現這些安全隱患,并盡可能將問題定位,方便問題的解決。

      工作原理

      軟件防火墻一般可以是包過濾機制。包過濾過濾規則簡單,只能檢查到第三層網絡層,只對源或目的IP做檢查,防火墻的能力遠不及狀態檢測防火墻,連最基本的黑客攻擊手法IP偽裝都無法解決,并且要對所經過的所有數據包做檢查,所以速度比較慢。硬件防火墻主要采用第四代狀態檢測機制。狀態檢測是在通信發起連接時就檢查規則是否允許建立連接,然后在緩存的狀態檢測表中添加一條記錄,以后就不必去檢查規則了只要查看狀態監測表就OK了,速度上有了很大的提升。因其工作的層次有了提高,其防黑功能比包過濾強了很多,狀態檢測防火墻跟蹤的不僅是包中包含的信息。為了跟蹤包的狀態,防火墻還記錄有用的信息以幫助識別包,例如已有的網絡連接、數據的傳出請求等。

      例如,如果傳入的包包含視頻數據流,而防火墻可能已經記錄了有關信息,防火墻進行匹配,包就可以被允許通過。。

      硬件防火墻比軟件防火墻在實現的機制上有很大的不同,也帶來了軟硬件防火墻在防黑能力上很大差異。

      原來防火墻與硬件防火墻是不一樣的,F在回想起當時小時候,那男同學問我的那幾個問題,現在想起還覺得自己當時是多么的無知小朋友們千萬不要學姐姐那樣無知哦!哈哈!愛玩電腦的小朋友要知道有防火墻與硬件防火墻這回事哦。因為防火墻與硬件防火墻都是保障你網絡安全和你個人信息泄露的重要防線哦!

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