固定真正個人計算機2007共有的網絡(NAT)互聯網不運作在窗口服務器2003年， 2008年和景色客人OS

在安裝窗口服務器以後2003年， 窗口服務器2008年 并且窗口景色到微軟真正個人計算機的虛擬機(VM) (更新裡 真正個人計算機2007 SP1)作為客人操作系統，和設置網絡設置為VM對用途共享網絡(NAT)作為網絡適配器，互聯網看上去不運作瀏覽器(Internet Explorer、IE和Firefox)的地方不可能連接，發現，位於或者瀏覽到網站。

然而，當使用時IP地址，對外在服務器的通入在互聯網也許運作。 例如，使用IP地址而不是域名或主機名，成功地連接到遠程服務器的用戶罐頭砰地作聲，蹤影路線、ftp、sftp、telnet和SSH。

NAT (網絡地址轉換法)是化妝或轉中頻式接收網絡信息流通量通過路由器介入重寫來源和目的地IP地址和IP小包的TCP/UDP通道數的一個容易的共有的網絡技術，當他們通過。 在真正個人計算機情況下，它使用在主機的缺省活躍網絡連接修造允許客人操作系統通過主人的互聯網連接訪問互聯網的一個真正NAT路由器。

共有的網絡或NAT允許計算機或主人在訪問互聯網的一個專用網使用一個唯一IP地址，无需暴露個人計算機(或虛擬機)在外在網絡，極大減少安全風險。 NAT也是有用允許實際上IP地址的無限的數字連接到互聯網，因而管理員沒有由相當數量IANA分配IP地址分配的空間限制。 在旁邊，共享網絡(NAT)容易地允許用戶對即插即用或者移動虛擬機或物理機器向不同的網絡佈局例如另外WiFi無線訪問接入點、家或者辦公室網絡。

包括2007臺虛擬機可能使用共有的網絡容易地訪問互聯網的真正個人計算機，一樣容易像，在操作系統之後安裝多數計算機，默認情況下使能DHCP。 如此，問題與窗口服務器2003年，服務器2008年和景色作為OS不可能訪問互聯網的客人是故意的。 互聯網不運作問題造成由，當為DNS服務器從共享網絡(NAT)時真正路由器，客人OS配置客人操作系統的詢問使用物理主機使用的同樣DNS服務器。

這雖則不是實際情形與窗口服務器2003年客人。 The problem is that Shared Networking configures the guest operating system to use the same DNS servers as are used by the physical computer. However, when actual DNS query resolving packets are been returned, it’s actually returned from the IP address of “192.168.131.254″, which is the virtual gateway used by Shared Networking (NAT).

Windows Server 2003, Windows Server 2008 and Windows Vista will reject any DNS resolution packets that are returned from a different source from than the DNS Server (both has different IP address) that it had requested the information from. As thus, all name resolution of domain name and URL fails, indirectly leads to the guest operating system appears to be cannot connect to Internet. Windows XP and older operating system is not affected by this behavior.

To fix the Shared Network (NAT) Internet no connection or not working issue, the resolution is to manually assign the IP address for the DNS Server for the guest operating system to 192.168.131.254, the virtual gateway IP address used by Virtual PC. To make the change (in guest operating system), open Network Connections folder (in Windows Vista, access via Network and Sharing Center), and right click Local Area Connection network icon to select its Properties. Then double click on Internet Protocl (TCP/IP) under General tab or Internet Protocol Version 4 (TCP/IPv4) under Networking (for Windows Vista) tab.

Click to select the radio button of Use the following DNS server addresses, and then type in 192.168.131.254 into the IP address box for Preferred DNS Server. Click OK twice to exit, and voila, the Shared Network (NAT) now works as it should with Internet access.

If you’re encountering this problem in Windows XP guest OS, it’s probably caused by invalid DNS server assigned by Virtual PC network adapter too.

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