Network Monitor Parses DNS WINS Lookup Queries as DNS Packets

ID: Q160828

The information in this article applies to:

Microsoft Windows NT Workstation version 4.0
Microsoft Windows NT Server version 4.0

SYMPTOMS

If you use Network Monitor to capture a trace of the Microsoft Domain Name Service (DNS) server doing a WINS lookup and display the capture, the Protocol column will say DNS even when the packet being sent to the WINS server is a NetBT packet destined for port 137.

CAUSE

Network Monitor parses DNS WINS Lookup packets as if they were DNS protocol packets. These are actually NetBT packets and should be parsed as such.

STATUS

Microsoft has confirmed this to be a problem in Windows NT Server version 4.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The capture will display the WINS Lookup name query as:


   + UDP: Src Port: DNS, (53); Dst Port: NETBIOS Name Service (137); Length
   = 58 (0x3A)
   + DNS: 0x8002:Std Qry for EKEFFCEJEDEPDECACACACACACACACAAA. of type
   Unknown Type

You would expect to see the following:


   + UDP: Src Port: DNS, (53); Dst Port: NETBIOS Name Service (137); Length
   = 58 (0x3A)
   + NBT: NS: Query req. for COMPUTER1

Additional query words: netmon

Keywords : kbnetwork kbbug4.00 ntprotocol NTSrvWkst
Version : WinNT:4.0
Platform : winnt
Issue type :