Microsoft KB Archive/132504

= Problem Using Same IP address for RAS and Network Card =

Article ID: 132504

Article Last Modified on 2/20/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q132504





SUMMARY
When you configure a network adapter card driver (including the MS Loopback driver) under Windows NT 3.51 to use the same IP address as the IP address of your RAS connection, you are unable to send network traffic over the RAS connection.

This is not true under Windows NT 3.5.



MORE INFORMATION
The configuration mentioned above does not work under Windows NT 3.51 by design. A RAS PPP connection is a distinct interface from the network card or the MS Loopback adapter driver. Therefore, a unique IP address is required for both the LAN interface and the PPP connection. You are able to use the same IP address under Windows NT 3.5 due to a problem with the RASIPHLP.DLL file. This problem was corrected in Windows NT version 3.51.

If you are not running the TCP/IP protocol on your local LAN, you are not required to bind TCP/IP to your network card. To disable the TCP/IP binding to the network card, run Control Panel and choose Network.

If you are required to use the TCP/IP protocol to participate on your local LAN, you must assign an IP address to your network card that is different than the IP address you are using for your RAS PPP connection.

Additional query words: route Internet prodnt

Keywords: kbnetwork KB132504

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