DNS May Return Wrong IP Address When Forwarding Query to WINS (197294)
The information in this article applies to:
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0
This article was previously published under Q197294 SYMPTOMS
When a client queries the Microsoft DNS server for an IP address, and the
DNS forwards the query to WINS, if the WINS server is busy, the DNS server
may return the IP address for a different name. This will happen on an
intermittent basis randomly.
CAUSE
When the DNS sends a query to WINS, it includes a transaction ID (XID) so
that it can match up responses to queries. If the DNS is busy and sending
many queries to WINS, and the WINS server is busy, it is possible for the
XID value to be reused by the DNS server before the WINS server returns the
result for the first query using the same XID. The DNS server looks for the
first matching XID in the list it was tracking, and returns the IP address
in that response to the DNS client.
RESOLUTION
The DNS now uses a larger number of unique XIDs. It also performs a check
to be sure that the name returned by the WINS server matches the name
queried on before returning the IP address to the requesting client.
A supported fix that corrects this problem is now available from Microsoft,
but has not been fully regression tested and should be applied only to
systems experiencing this specific problem. If you are not severely
affected by this specific problem, Microsoft recommends that you wait for
the next Windows NT service pack that contains this fix.
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 on support costs, please go
to the following address on the World Wide Web:
The English version of this fix should have the following file attributes
or later:
Date Time Size File Name Platform
--------------------------------------------------------------
11/17/98 02:23p 176,912 Dns.exe (x86)
11/17/98 02:23p 297,232 Dns.exe (Alpha)
STATUS
Microsoft has confirmed this to be a problem in Windows NT version 4.0.
| Modification Type: | Minor | Last Reviewed: | 9/23/2005 |
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| Keywords: | kbHotfixServer kbQFE kbbug kbfix kbQFE KB197294 |
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