DDOS簡介
DDOS又稱為分布式拒絕服務，全稱是Distributed Denial of Service。DDOS本是利用合理的請求造成資源過載，導緻服務不可用，進而造成伺服器拒絕正常流量服務。就如酒店裡的房間是有固定的數量的，比如一個酒店有50個房間，當50個房間都住滿人之後，再有新的使用者想住進來，就必須要等之前入住的使用者先出去。如果入住的使用者一直不出去，那麼酒店就無法迎接新的使用者，導緻酒店負荷過載，這種情況就是“拒絕服務”。如果想繼續提供資源，那麼酒店應該提升自己的資源量，伺服器也是同樣的道理。
具體過程：
當你要通路某一主機或網站時，首先，将資料包發送到目标主機，并發出連接配接請求。這将啟動 TCP 連接配接（兩個主機用于通信的程序）。目标主機一旦接收到一個請求的資料包（SYNchronize 資料包），就會相應地傳回一個響應的資料包（SYN-ACKnowledge 資料包）。
防護方法：
1：采用高性能的網絡裝置
抗DDoS攻擊首先要保證網絡裝置不能成為瓶頸，是以選擇路由器、交換機、硬體防火牆等裝置的時候要盡量選用知名度高、口碑好的産品。再就是假如和網絡提供商有特殊關系或協定的話就更好了，當大量攻擊發生的時候請他們在網絡接點處做一下流量限制來對抗某些種類的DDoS攻擊是非常有效的。
2：盡量避免 NAT 的使用
無論是路由器還是硬體防護牆裝置要盡量避免采用網絡位址轉換 NAT 的使用，因為采用此技術會較大降低網絡通信能力，其實原因很簡單，因為 NAT 需要對位址來回轉換，轉換過程中需要對網絡包的校驗和進行計算，是以浪費了很多 CPU 的時間，但有些時候必須使用 NAT，那就沒有好辦法了。
3：充足的網絡帶寬保證
網絡帶寬直接決定了能抗受攻擊的能力，假若僅僅有 10M 帶寬的話，無論采取什麼措施都很難對抗現在的 SYNFlood 攻擊，目前至少要選擇 100M 的共享帶寬，最好的當然是挂在 1000M 的主幹上了。
4：更新主機伺服器硬體
在有網絡帶寬保證的前提下，盡量提升硬體配置，要有效對抗每秒10萬個SYN攻擊包，伺服器的配置至少應該為：P4 2.4G/DDR512M/SCSI-HD，起關鍵作用的主要是CPU和記憶體，記憶體一定要選擇DDR的高速記憶體，硬碟要盡量選擇SCSI的，要保障硬體性能高并且穩定，否則會付出高昂的性能代價。
5：把網站做成靜态頁面或者僞靜态
大量事實證明，把網站盡可能做成靜态頁面，不僅能大大提高抗攻擊能力，而且還給黑客入侵帶來不少麻煩。
馳網科技杭州高防機房IP：
43.228.42.1
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