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Question Title 為何要設定Router PORT FORWARDING

為何要 設定 Router PORT FORWARDING?

 

大多數人家中都會有兩部或更多的電腦,但只有一個ISP線路,又想每一台電腦都能連上Internet,所以用了Router作分享頻寬;

 

不過用了Router後,如要架設伺服器 、開設電台 等 ,就必須做一些額外設定,例如PORT FORWARDING!

 

 

 

在區域連線連結到外聯網(WAN)的流程:

(圖1)

  

用了Router後架設伺服器的問題,經由外聯網接入時,到了ROUTER 的部份後,ROUTER 不能自動接入那一部主機:

(圖2)

 
 

就是因為圖2的問題,所以我們要設定一個指令給Router讓它知道應該把資料由外聯網(WAN) 經由那一個port轉接到內聯網的主機

 

這個指令有 NAT (Net Address Translation) 的 Port Mapping(Port Forwarding)DMZ (De-Militarized Network) .

 

 

 

DMZ 與 Port Mapping(Port Forwarding) 又有何分別?

 
 

DMZ   Port Mapping (Port Forwarding)

假設DMZ: 192.168.11.3

 所有Port都是會連到192.168.11.3這部主機!

 

假設 Port Mapping:
Port 80 → 192.168.11.3
Port 90 → 192.168.11.4

優點: 方便,任何Port都是連到同一部機   每個Port 都有獨有的主機

缺點:

因所有Port開放,安全性較低   每當有一個新軟件需要開放Port時,
又要進行多次相關設定
Authored by: Bunny Cheng This question has been viewed 86822 times so far.
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Article Number: 451
Created: 2008-11-29 10:49 AM
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