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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 - View products that this article applies to.
This article was previously published under Q301453
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.
The TCP/IP stack does not handle IP multicasts correctly and transmits the last fragment of each multicast datagram on the network.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
Windows 2000To 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:
260910The English version of this fix should have the following file attributes or later:
(http://support.microsoft.com/kb/260910/EN-US/ )How to Obtain the Latest Windows 2000 Service Pack
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 XPThe 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
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.
For additional information about dialup networking and Windows 2000, click the article number below to view the article in the Microsoft Knowledge Base:
311935For 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:
(http://support.microsoft.com/kb/311935/EN-US/ )Multicasts with a TTL Setting of Zero Are Transmitted on the Network
329128For 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:
(http://support.microsoft.com/kb/329128/EN-US/ )Multicast Packets with TTL=0 Transmitted by Windows 98 and Windows Millenium Edition
(http://support.microsoft.com/kb/249149/EN-US/ )Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
Article ID: 301453 - Last Review: February 22, 2007 - Revision: 3.6