網際網路連線共用
在公司內有10幾台電腦想上網，卻只有一個對外的IP時，通常會使用NAT的方式。但在公司沒有NAT設備or windows server等級的作業系統時，該怎麼辦呢，其實windows client 端的作業系統有提供一個名為「網際網路連線共用」的方法來解決此問題。網際網路連線共用的運作流程就好像公司內部有架設了DHCP、NAT一樣，但是設定上更為簡單。以下就分享給大家設定的方法。
以下網際網路連線共用簡稱ICS(Internet Connection Share)
1、在想要建立ICS的CLIENT端上必須有2張網卡，先設定外部IP，而內部IP使用自動取得選項即可(設定IP的步驟在這就不貼圖了)。完成之後，接著要設定ICS，如下圖，設定ICS時，一樣要先點選內容。
2、在內容的視窗中，點選共用的頁籤，並將核取方塊打勾(設定的按鈕中，可以選取想要執行的服務)。如下圖：
3、通常前2個步驟完成之後，ICS就設定完成了。但過程中可能會出現此警示，這代表要設定為對內IP的那張網卡上，有手動設定一組靜態IP，但ICS設定過程中會將原來手動設定的IP改為192.168.137.1這組IP。(註：如果內部IP想要用自己所熟悉的，在ICS設定完成之後，還是可以自己手動進行更改，但預設會由ICS先自動建立)
好了，上述即為ICS設定，接下來就是要設定其它CLIENT端了。而其它的CLIENT端設定就更為容易了，只需想像成公司內部已經架設完畢DHCP即可，設定如下。
1、在網路卡上按右鍵點選內容
2、在內容中雙擊TCP/IPv4的選項
3、在內容中點選「自動取得IP位址」即可完成設定，按確定後關閉此視窗
4、接著我們來檢視一下IP的相關設定，檢視過程如下圖：
相信聰明的大家一定發現了，CLIENT端收到了來自「安裝ICS的CLIENT端」的IP位址，就好像公司內部有架設了DHCP、NAT。ICS是個簡易又方便的解決方案，但隨著公司越大，且需求越趨複雜時，還是建議公司購買server來架設DHCP、NAT…..等的服務。舉個例子吧，如果使用ICS，只能由公司內部連上INTERNET，但如果要在家中遠端連線進公司某台CLIENT，就不被允許了，原因很簡單，因為ICS沒辦法做內部IP的映射所導致。 希望這篇可以解決想要在為數不多的電腦的公司中，想要快速架設網路上網的需求。
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