Hi
Maybe this will help:
Problem:
I have one machine that generates an event 8003 (believes it is the master
browser and is forcing an election) every hour for the first few hours of
the day and then sporadically from then on.
Solution:
Reference Link:
http://support.microsoft.com/default.aspx?scid=kb;en-us;135464
8003 Browsing Errors with UDP Forwarding
SYMPTOMS
========
The following error messages are added to your domain controller's system
log (as seen with the Event Viewer) approximately every 12 minutes:
Event Log information:
Date: 6/14/95 Event ID: 8003
Time: 12:12:00 PM Source: Rdr
User: N/A Type: Error
Computer: MyPDC Category: None
The master browser has received a server announcement from the computer
MyBDC that believes that it is the master browser for the domain on
transport NetBT_NETFLX1. The master browser is stopping or an election is
being forced.
Data: Words
0000: 00000000 004a0003 00000000 c0001f43
0010: 00000000 00000000 0000055a 00000000
0020: 00000000 00000000
CAUSE
=====
Routers on your network are configured to forward UDP broadcasts.
If a Windows domain spans more than one subnet and the TCP/IP protocol
(NetBT) is used, each subnet will have a Master Browser. If a Master
Browser receives server announcements from another computer, claiming to be
a Master Browser, an election is forced to ensure that there is only one
Master Browser per subnet. These browser elections cause the 8003 message
to be recorded.
If the routers on the network are configured to forward UDP broadcasts to
UDP ports 137 and 138, then the election broadcasts that are intended to
remain in the subnet are forwarded to other subnets.
This has also been seen with bridges or switches between two dissimilar
network segments within the same subnet.
RESOLUTION
==========
To stop the 8003 error messages, make sure the routers on the network are
not forwarding UDP broadcasts, keeping browser elections on NetBT local to
each subnet and enable WINS or lmhosts on the network for netbios name
resolution.
NOTE: Switches configured for VLAN's (virtual segmentation) have to be
configured on a per VLAN basis to prevent UDP broadcast propagation.
MORE INFORMATION
================
For related information, please see the following article in the Microsoft
Knowledge Base: UDP Broadcast Forwarding by Cisco's IP Helper
The information in this article applies to:
o Microsoft Windows 2000 Server
o Microsoft Windows 2000 Advanced Server
o Microsoft Windows 2000 Professional
o Microsoft Windows 2000 Datacenter Server
o Microsoft Windows NT Server 3.1
o Microsoft Windows NT Server 3.5
o Microsoft Windows NT Server 3.51
o Microsoft Windows NT Server 4.0
o Microsoft Windows NT Workstation 3.1
o Microsoft Windows NT Workstation 3.5
o Microsoft Windows NT Workstation 3.51
o Microsoft Windows NT Workstation 4.0
o Microsoft Windows NT Advanced Server
Shilpa Sinha
This posting is provided "AS IS" with no warranties, and confers no rights.
