When you are using a multicast program to send data of up
to 1472 bytes over Ethernet, you may observe fragmentation.
maximum transmission unit (MTU) size for Ethernet is 1500. The various parts of
a user data protocol (UDP) packet use the following bytes (totalling 1500
- 20 bytes for the IP header.
- 8 bytes for the UDP header.
- 1472 bytes for data load.
You can expect that fragmentation will not occur when you send
up to 1472 bytes of data over Ethernet.
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:
How to Obtain the Latest Windows 2000 Service Pack
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.
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
: 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) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone
tab in the Date and Time tool in Control Panel.
Date Time Version Size File name
19-Nov-2001 16:42 5.0.2195.46 118,896 Afd.sys
06-Apr-2002 16:51 5.0.2195.48 105,232 Msafd.dll
06-Apr-2002 16:50 5.0.2195.55 313,168 Tcpip.sys
30-Jul-2001 20:15 5.0.2195.39 16,240 Tdi.sys
06-Apr-2002 16:51 5.0.2195.48 17,680 Wshtcpip.dll
this problem, obtain the latest service pack for Windows XP. For additional
information, click the following article number to view the article in the
Microsoft Knowledge Base:
How to Obtain the Latest Windows XP Service Pack
The English version of this fix should have the
following file attributes or later:
Date Time Version Size File name
22-Apr-2002 13:50 5.1.2600.43 318,080 Tcpip.sys
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 4. This problem was first corrected in Windows XP Service
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:
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:
Use QChain.exe to Install Multiple Hotfixes with One Reboot