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  3. 學習啦>學習電腦>網絡知識>路由器>路由器知識大全>《路由器怎么啟動加載》正文

    路由器怎么啟動加載

    時間:2015-10-13 13:36:18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

      大家都對路由器有一定的了解,接下來學習啦小編給大家介紹的是路由器怎么啟動加載。希望能幫到大家。

      一、磊科路由器啟動時,在出現CLI提示符之前,將經歷幾個測試階段、發現磊科IOS和配置文件。路由器啟動時,通常會經過以下5個步驟:

      1、加載并執行POST,發現ROM,測試硬件組件,如閃存和接口;

      2、加載并執行引導自舉程序;*引導自舉程序發現并加載磊科IOS映像文件。這些映像文件可以來自閃存、TFTP服務器或者閃存;

      3、加載了磊科IOS之后,發現并執行一個配置文件:配置文件儲存在NVRAM中,但如果NVRAM是空的,系統配置對話框開始,或者路由器使用TFTP來獲取一個配置文件;*給用戶CLI EXEC提示符。

      二、在發現一個磊科IOS文件時,假定在NVRAM中沒有boot system命令,路由器首先在閃存中尋找有效的磊科IOS映像文件。如果閃存中沒有IOS映像文件,路由器執行TFTP啟動,或者網絡啟動;發送本地廣播請求從TFTP服務器上獲取操作系統文件,如果這個過程也失敗了,路由器從內存中加載IOS映像文件。

    路由器怎么啟動加載

      三、因為啟動過程中用到TFTP,而對加載過程沒有安全保護。所以,不應該允許路由器使用該功能。要阻止該功能,使用下面的配置:

      Router(config)#no boot network remote-url-ftp;

      [[[//[username:[:password]@]location]/directory]/filename]-rcp;

      [[[//[username@]/location]/directory]/filename]-tftp;

      [[[//location]/directory]/filename。

      四、加載了IOS映像之后,開始發現一個配置文件。如果在NVRAM中沒有配置文件,路由器會使用系統配置對話框來建立配置文件,或使用網路配置選項:使用TFTP廣播來發現配置文件。所以,應該使用以下的命令關閉該特性:Router(config)#no service config。

      五、大多數磊科路由器都會向外發送無根據的ARP消息,無論客戶端何時連接并基于PPP連接協商一個IP地址。ARP毒害攻擊主要利用的就是這種ARP消息,即使客戶端從一個本地地址池收到地址,磊科路由器也會生成一個無根據的ARP傳送。

      六、禁止無根據ARP傳送,使用下面的命令:Router(config)#no ip gratuitous-arps 十五、關閉IP無類別路由選擇服務,路由器可能會收到一些發往一個沒有網絡缺省路由的子網的數據包,如果啟用了IP無類別服務時,會將這些數據包轉發給最有可能路由的超網,要關閉IP無類別路由選擇,在全局配置模式下使用no ip classless命令。

      以上就是今天我們要給大家介紹的內容,相信大家在看完后應該已經了解其根本的含義,只有了解了這些,你才能夠配置出最合理的網絡環境,LinkSys路由器設置也是一樣的,有興趣的網友可以看一下。

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    我們采用的作品包括內容和圖片全部來源于網絡用戶和讀者投稿,我們不確定投稿用戶享有完全著作權,根據《信息網絡傳播權保護條例》,如果侵犯了您的權利,請聯系:xuexila888@qq.com,我站將及時刪除。

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