DOCUMENT:Q178550  09-AUG-2001  [winnt]
TITLE   :IP Address Conflict with Address 0.0.0.0
PRODUCT :Microsoft Windows NT
PROD/VER:WinNT:4.0
OPER/SYS:
KEYWORDS:kbWinNT400sp4fix

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 
 - Microsoft Windows NT Workstation version 4.0 
 - Microsoft Windows NT Server version 4.0, Terminal Server Edition 
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SYMPTOMS
========

After you install ICMP-fix, the following events may be logged in the system
event log:

   Event ID: 4199
   Source: TCP/IP
   Description: The system detected an address conflict for IP address
   0.0.0.0 with the system having network hardware address
   xx:xx:xx:xx:xx:xx. Network operations on this system may be disrupted as
   a result.

   Event ID: 26
   Source: Applications Popup

For more information on ICMP-fix, please see the following article in the
Microsoft Knowledge Base:

   ARTICLE-ID: Q143478
   TITLE : Stop 0A in TCPIP.SYS When Receiving Out Of Band (OOB) Data

CAUSE
=====


The ICMP hotfix includes a fix where ARP requests sent from 0.0.0.0 are now
processed. The handling of ARP requests sent from 0.0.0.0 has been introduced
because RFC 1541 suggests that a DHCP client should verify an IP lease offered
from a DHCP server by sending an ARP request. In the RFC, the sender's IP
address is defined as 0.0.0.0.

If a computer is in a state where it has no valid IP address lease (for example,
when starting or when the lease has expired), the computer's TCP/IP stack is
initialized with the address 0.0.0.0.

If, in this state, an ARP request with sender's IP address 0.0.0.0 is received,
the above events will be logged.

For additional information on the ICMP hotfix, please see the following article
in the Microsoft Knowledge Base:

   ARTICLE-ID: Q154174
   TITLE : Invalid ICMP Datagram Fragments Hang Windows NT, Windows 95


RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
Windows NT Server 4.0, Terminal Server Edition. For additional information,
please see the following article in the Microsoft Knowledge Base:

   Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


STATUS
======

Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT
Server 4.0, Terminal Server Edition. This problem was first corrected in Windows
NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition
Service Pack 4.


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Keywords          : kbWinNT400sp4fix 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch
Version           : WinNT:4.0
Issue type        : kbbug
Solution Type     : kbfix

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