Microsoft KB Archive/322018

= L2TP May Not Use the Default IP Address =

Article ID: 322018

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q322018



SYMPTOMS
Layer 2 Tunneling Protocol (L2TP) may not use the default IP address as the source when it makes new connections. This occurs if you have multiple IP addresses that are specified on the network adapter. Typically, the default IP address is the first IP address that is bound. L2TP may use any bound IP address as its source when it sends packets. This can cause problems with firewalls such as Microsoft ISA Server which may block IP addresses except for the default IP address.



CAUSE
L2TP over IP is not designed to look for the default IP address.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later):

  Date         Time     Version        Size     File name -  10-Jun-2002  7:30:18  5.0.2195.5873   58,128  Rasman.dll 26-Jul-2002 13:55:34 5.0.2195.5967  152,848  Rasmans.dll 10-Jun-2002 7:30:18  5.0.2195.5873   54,032  Rastapi.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

Additional query words: ISAKMP Negotiation

Keywords: kbhotfixserver kbqfe kbnetwork kbwin2ksp4fix kbbug kbenv kbfix kbui kbwin2000presp4fix KB322018

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