Microsoft KB Archive/301453

= Multicast Packets with a TTL Setting of 0 Are Transmitted by the Windows 2000 TCP/IP Stack and the Windows XP TCP/IP Stack =

Article ID: 301453

Article Last Modified on 2/22/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional

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This article was previously published under Q301453



SYMPTOMS
When you have a program that sends IP multicasts with a time-to-live (TTL) setting of 0 (zero) to communicate with other local programs, multicasts with a TTL setting of 0 should not be transmitted on the network (they should only be looped back to other programs in the local computer). However, if you monitor network traffic you see that IP multicasts with a TTL setting of 0 are transmitted on the network. This may cause the network to become overloaded.



CAUSE
The TCP/IP stack does not handle IP multicasts correctly and transmits the last fragment of each multicast datagram on the network.



RESOLUTION
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 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/default.aspx?scid=fh;EN-US;CNTACTMS

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.

Windows 2000
To resolve this problem, obtain the latest service pack for 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

The English version of this fix should have the following file attributes or later:   Date         Time   Version         Size     File name -  27-Jul-2001  01:04  5.00.2195.3951  118,864  Afd.sys 03-Aug-2001 12:17  5.00.2195.3952  105,232  Msafd.dll 27-Jul-2001 06:01  5.00.2195.3958  312,496  Tcpip.sys 30-Jul-2001 20:15  5.00.2195.3988   16,240  Tdi.sys 03-Aug-2001 12:17  5.00.2195.3649   17,680  Wshtcpip.dll

Windows XP
The English version of this fix should have the following file attributes or later:   Date         Time   Version             Size   File name --  04-Dec-2001  12:02  5.1.2600.21       318,080  Tcpip.sys



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 Windows 2000 Service Pack 3.



MORE INFORMATION
For additional information about dialup networking and Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:

311935 Multicasts with a TTL Setting of Zero Are Transmitted on the Network

For additional information multicast packets and Microsoft Windows 98, Microsoft Windows 98 Second Edition, and Microsoft Windows Millenium Edition, click the article number below to view the article in the Microsoft Knowledge Base:

329128 Multicast Packets with TTL=0 Transmitted by Windows 98 and Windows Millenium Edition

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Additional query words: kbNetworking

Keywords: kbbug kbfix kbwin2000presp3fix kbqfe kbwin2000sp3fix kbnetwork kbhotfixserver KB301453

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