Microsoft KB Archive/189101

= Understanding NetBIOS Resource Record Flags =

Article ID: 189101

Article Last Modified on 2/23/2007

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APPLIES TO


 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows 3.11 Standard Edition
 * Microsoft Windows 95
 * Microsoft Windows 98 Standard Edition

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This article was previously published under Q189101



SUMMARY
The NetBIOS resource record flag fields define whether the record is unique or group and the second flag reports node type.



MORE INFORMATION
Text from section 4.2.1.3 of RFC 1002:

  NB_FLAGS field of the RESOURCE RECORD RDATA field for RR_TYPE of "NB":

1  1   1   1   1   1     0   1   2   3   4   5   6   7   8   9   0   1   2   3   4   5   +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+   | G |  ONT  |                RESERVED                           | +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+

Symbol    Bit(s)   Description:

RESERVED    3-15   Reserved for future use. Must be zero (0). ONT          1,2   Owner Node Type: 00 = B node 01 = P node 10 = M node 11 = Reserved for future use For registration requests this is the claimant's type. For responses this is the actual owner's                      type. G              0   Group Name Flag. If one (1) then the RR_NAME is a GROUP NetBIOS name. If zero (0) then the RR_NAME is a UNIQUE NetBIOS name.

The Owner Node Type (ONT) indicates the node type of the client. B node is 00, P node is 01, M node is 10, H node is 11.

The Group (G) is only used if the record is being registered/refreshed or released by the NetBIOS name server. If the flag is set to one, this indicates that the record is group NetBIOS name. If it is set to zero, it is a unique name.

The NetBIOS Name Server (NBNS) support of these fields is optional and Windows Internet Name Service (WINS), which is an NBNS server does not record the ONT field, nor do our clients use this field. Because of this, any WINS query response packet will populate this field with 00.

For more information about NetBIOS Resource Record Flags, please see RFC1002.

RFCs may be obtained via the Internet as follows:

Paper copies of all RFCs are available from the NIC, either individually or on a subscription basis (for more information, contact NIC@NIC.DDN.MIL). Online copies are available via FTP or Kermit from NIC.DDN.MIL as rfc/rfc####.txt or rfc/rfc####.PS (#### is the RFC number without leading zeros).

Additionally, RFCs may be requested through electronic mail from the automated NIC mail server by sending a message to SERVICE@NIC.DDN.MIL with a subject line of "rfc ####" for text versions, or a subject line of "rfc ####.PS" for PostScript versions. To obtain the RFC index, the subject line of your message should read "rfc index".

Additional query words: Netbt flags netbios node kbDSupport

Keywords: kbinfo KB189101

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