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      青鳥老師告訴您:配置布署無線網絡的五大原則
      作者: 添加時間:10-13 瀏覽次數:0

      建立安全的無線網絡訪問節點(access point )的出發點在于如阿防止信息向非授權外部訪問的泄漏。這一原則往往是知宜行難。由于無線網絡的安全設置要比一般的線纜網絡復雜的多,因為線纜網絡的訪問節點都是固定的,而在無線網絡的信號收發范圍內,所有的節點都可以接入。

        無線網絡本身的特點所造成的問題是無法避免的,但采取正確的無線網絡系統防護手段將保護用戶的系統,并避免嚴重的安全問題。 而如草率配置,該非安全無線網絡將導致“服務不可用”或成為攻擊其它網絡的“跳板”。為了把安全漏洞所造成的風險降至最低,請確保網絡技術人員按照以下建議進行配置和測試。

          1、使用WEP(無線加密協議)

        WEP(無線加密協議)是針對無線網絡數據傳輸加密的標準。盡管它仍存在明顯的脆弱性,但用來防范普通黑客還是相當有效的。許多無線訪問節點產品的廠商都把WEP設置為disable,以方便安裝。因此節點天線一旦開始收發信號,黑客就可以通過嗅探器對無線數據明文進行訪問。

        2、規劃好天線安裝位置

        這是實現“非泄漏”無線訪問節點的第一步,通過無線信號的覆蓋范圍來確定訪問節點天線的擺放位置。請注意不要把天線放置在窗戶旁邊,因為玻璃無法擋住信號的外泄。在理想情況下,信號發射天線最好放置在工作區域的正中間,這樣就可以把信號泄漏降至最低程度。當然上述情況不大可能完全做到,但只要盡量保證按上述原則來執行就不會有錯。

          3、取消動態主機配置協議(DHCP)

        這一安全策略聽起來頗有些奇怪,但對于無線網絡的安全來說是非常有效的。采取了這一措施后,黑客將不得不猜錯貴單位網絡的IP地址、子網掩碼以及其它所必須的TCP/IP參數。即使黑客可以訪問貴單位的無線網絡節點,但如果不知道IP地址等上述內容,仍是不得其門而入。


        4、更改SSID設置并取消廣播

        服務設置初始化校驗器(SSID,service set identifier)用來鑒別無線訪問節點所使用的初始化字符串,客戶端要通過SSID來完成連接的初始化。該校驗器由制造商進行設定,同一廠商產品使用同樣的默認值,比如3Com公司的設備使用“101”字符串。如果被黑客了解到相應的初始化字符串,那么就可以輕易建立非授權鏈接。因此筆者建議,在配置貴單位無線網絡時,請更改SSID初始化字符串,使其難于猜測,并在條件許可的情況下,限制校驗器的SSID廣播,以此來杜絕非法鏈接。該網絡將依然可用,但不會給黑客以可乘之機。


        5、取消或更改SNMP設置

        如果貴單位訪問節點支持SNMP,那么或者取消它或者更改Public和Private公用字符串。如果不采取這一步驟,那么黑客將利用SNMP來獲取貴單位網絡的重要信息。
       


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