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Last Updated December 16, 2003

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Network Address Translation (NAT) 

NAT is a standard feature of Windows 2000 Server's Routing and Remote Access Service (RRAS) and Win2K Professional's Internet Connection Sharing (ICS) component that lets an Internet-connected host act as an Internet gateway for internal LAN clients. NAT translates clients' internal network IP addresses into the appropriate address on the NAT-enabled gateway device and protects internal client IP addresses by making them inaccessible to Internet hosts.
Where to Start....
Understanding NAT
Short article by Sean Daily that provides a little background on NAT and SecureNAT. Source: Windows & .NET Magazine (August 2000)

Windows 2000's Network Address Translation
With translated connections, Win2K Server acts as an IP router and translates packets from the SOHO hosts to the Internet hosts. In Win2K Server Release Candidate 2 (RC2), build 2128, you can use Microsoft Internet Connection Sharing (ICS) or Network Address Translation (NAT) to configure translated connections to the Internet. The variations include traditional Network Address Translator, two-way Network Address Translator, twin Network Address Translator, host Network Address. Source: Windows 2000 Magazine (February 2000)

Network Address Translation (NAT) Deployment and Features
Microsoft Online Support WebCast provides a basic overview of configuration and features that are available. It will also cover basic configuration issues to be aware of
 
Articles, Whitepapers, and Online Courses
How to Configure Input Filters for Services That Run Behind Network Address Translation 
Microsoft Knowledge Base Article: 254018 - Provides filter setup information which may be used to remove unwanted traffic for a network card exposed to the Internet on a Microsoft Windows 2000 computer.

HOW TO: Configure Clients to Use a Network Address Translation Server in Windows  
Microsoft Knowledge Base Article: 300851 - With network address translation (NAT) in Windows 2000, you can configure your home network or small office network to share a single connection to the Internet. This step-by step guide describes how to configure a computer that is running Windows to use a NAT server. This article assumes that you have a working NAT server and that your client computers have a stable network connection to the NAT server.

HOW TO: Configure a Windows 2000 Server as a Network Address Translation Server 
Microsoft Knowledge Base Article: 299801 - You can use Network Address Translation (NAT) in Windows 2000 to connect computers on a home or small office network that are on a single subnet to the Internet by adding the NAT routing protocol to the Routing and Remote Access service (RRAS)

How to Use NAT for Incoming RAS Connections on the Same RRAS Server 
Microsoft Knowledge Base Article: 310888 - This article describes how to enable Internet connectivity for incoming Remote Access Service (RAS - clients that are using Network Address Translation (NAT - on the same server.

Inbound PPTP Traffic and Windows 2000 Network Address Translation
Microsoft Knowledge Base Article: 263925 - Network Address Translation (NAT) in Windows 2000 has a built-in Point-to-Point Tunneling Protocol (PPTP) Editor that allows NAT clients to establish PPTP connections to external Virtual Private Network servers. An Editor is necessary because

Mapping a Drive on Local Network Forces ICS/NAT Host to Dial 
Microsoft Knowledge Base Article: 260555 - If you issue a net use * \\workstation\share /user:securityprovider\username password command on a Windows 2000-based computer that is running Internet Connection Sharing (ICS) or Network Address Translation (NAT), the computer may dial the Internet.

Windows 2000: New Features in TCP/IP Implementation 
Microsoft Online Support WebCast provides an introduction to some of the new features included in the Windows 2000 implementation of TCP/IP, including AutoNet, Dynamic DNS, and Network Address Translation (NAT).

Troubleshooting: Known Bugs and Issues

Conflicts Between Services Requesting Use of Network Address Translation Modules
Microsoft Knowledge Base Article: 254322 - This article describes errors that occur when components or services request use of the Network Address Translation (NAT) modules in Microsoft Windows 2000.

Demand Dial Filters Do Not Work When Network Address Translation Is Installed
Microsoft Knowledge Base Article: 254245 - When you are using a Microsoft Windows 2000-based computer with the Network Address Translation (NAT) feature in use, the demand dial filters do not work. Demand dial filters are designed to prevent the demand-dial interface from connecting

Event ID 30012 Occurs with Windows 2000 Network Address Translation Service
Microsoft Knowledge Base Article: 271994 - When you use a Windows 2000-based computer that is running the Network Address Translation (NAT) service, the following event ID may be logged in the system log (even though the NAT service is functioning):

Internet Printing May Not Work on a Network Address Translation Server
Microsoft Knowledge Base Article: 252416 - After you share a printer on a Windows 2000-based server that is also running Network Address Translation (NAT) for communication with the Internet, attempting to connect to the server by using an

NAT Does Not Properly Forward ICMP "Destination Unreachable" Packet That Is Generated on the NAT Server
Microsoft Knowledge Base Article: 268773 - In the following scenario, it may not work to copy a file from the private network to a server on the public side of the Network Address Translation (NAT). The file name is created on the outside server, but the length of the file may be

Network Address Translation Mapping Is Not Successful and an Event ID 32003 Is Logged
Microsoft Knowledge Base Article: 293497 - After you configure one-to-one address mapping in the Network Address Translation (NAT) in the Routing and Remote Access service, the client computers that are not included in the NAT may be unable to access the computer on the private network and the following error is logged to the System event log on the NAT server: Event ID: 32003 Source: Ipnathlp  The Network Address Translator (NAT) was unable to request an operation of the kernel-mode translation module. This may indicate misconfiguration, insufficient resources, or an internal error. The data is the error code.  

Network Program Settings Not Saved in Some Localized Versions of Windows 2000
Microsoft Knowledge Base Article: 262050 - Network program settings for Network Address Translation (NAT) that you add in the Routing and Remote Access snap-in may not be saved. This may occur on localized versions of Windows 2000 Server that use a Windows code page other than 1250 by default.

RAS Clients Cannot Gain Access to the Internet Using Network Address Translation
Microsoft Knowledge Base Article: 253145 - You can configure the Network Address Translation (NAT) protocol on a server running Routing and Remote Access Service (RRAS) to allow network clients with private addresses to gain access to the Internet. NAT allows the RRAS server to use  

Windows 2000 NAT DHCP Allocator Service Logs Event 30001
Microsoft Knowledge Base Article: 272076 - A Windows 2000-based server running the Network Address Translation (NAT) service with the DHCP allocator function may log the following system event log

Windows 2000 NAT Does Not Translate Netlogon Traffic
Microsoft Knowledge Base Article: 263293 - When you try to log on to a domain from a computer that is running Microsoft Windows NT 4.0, Microsoft Windows 95, or Microsoft Windows 98, and is located behind a Windows 2000-based server that is performing network address translation (NAT) 

Windows 2000 with Internet Connection Sharing or Network Address Translation Drops Packets
Microsoft Knowledge Base Article: 264883 - Client connections to resources that are made through a Windows 2000 host that is running Internet Connection Sharing (ICS) or Network Address Translation (NAT) may not work, but clients can ping the destination host. 


 

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