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Network Working Group Request for Comments: 1002 March, 1987 PROTOCOL STANDARD FOR A NetBIOS SERVICE ON A TCP/UDP TRANSPORT: DETAILED SPECIFICATIONS ABSTRACT This RFC defines a proposed standard protocol to support NetBIOS services in a TCP/IP environment. Both local network and internet operation are supported. Various node types are defined to accommodate local and internet topologies and to allow operation with or without the use of IP broadcast. This RFC gives the detailed specifications of the NetBIOS-over-TCP packets, protocols, and defined constants and variables. A more general overview is found in a companion RFC, "Protocol Standard For a NetBIOS Service on a TCP/UDP Transport: Concepts and Methods". NetBIOS Working Group [Page 1]  RFC 1002 March 1987 TABLE OF CONTENTS 1. STATUS OF THIS MEMO 4 2. ACKNOWLEDGEMENTS 4 3. INTRODUCTION 5 4. PACKET DESCRIPTIONS 5 4.1 NAME FORMAT 5 4.2 NAME SERVICE PACKETS 7 4.2.1 GENERAL FORMAT OF NAME SERVICE PACKETS 7 4.2.1.1 HEADER 8 4.2.1.2 QUESTION SECTION 10 4.2.1.3 RESOURCE RECORD 11 4.2.2 NAME REGISTRATION REQUEST 13 4.2.3 NAME OVERWRITE REQUEST & DEMAND 14 4.2.4 NAME REFRESH REQUEST 15 4.2.5 POSITIVE NAME REGISTRATION RESPONSE 16 4.2.6 NEGATIVE NAME REGISTRATION RESPONSE 16 4.2.7 END-NODE CHALLENGE REGISTRATION RESPONSE 17 4.2.8 NAME CONFLICT DEMAND 18 4.2.9 NAME RELEASE REQUEST & DEMAND 19 4.2.10 POSITIVE NAME RELEASE RESPONSE 20 4.2.11 NEGATIVE NAME RELEASE RESPONSE 20 4.2.12 NAME QUERY REQUEST 21 4.2.13 POSITIVE NAME QUERY RESPONSE 22 4.2.14 NEGATIVE NAME QUERY RESPONSE 23 4.2.15 REDIRECT NAME QUERY RESPONSE 24 4.2.16 WAIT FOR ACKNOWLEDGEMENT (WACK) RESPONSE 25 4.2.17 NODE STATUS REQUEST 26 4.2.18 NODE STATUS RESPONSE 27 4.3 SESSION SERVICE PACKETS 29 4.3.1 GENERAL FORMAT OF SESSION PACKETS 29 4.3.2 SESSION REQUEST PACKET 30 4.3.3 POSITIVE SESSION RESPONSE PACKET 31 4.3.4 NEGATIVE SESSION RESPONSE PACKET 31 4.3.5 SESSION RETARGET RESPONSE PACKET 31 4.3.6 SESSION MESSAGE PACKET 32 4.3.7 SESSION KEEP ALIVE PACKET 32 4.4 DATAGRAM SERVICE PACKETS 32 4.4.1 NetBIOS DATAGRAM HEADER 32 4.4.2 DIRECT_UNIQUE, DIRECT_GROUP, & BROADCAST DATAGRAM 33 4.4.3 DATAGRAM ERROR PACKET 34 4.4.4 DATAGRAM QUERY REQUEST 34 4.4.5 DATAGRAM POSITIVE AND NEGATIVE QUERY RESPONSE 34 5. PROTOCOL DESCRIPTIONS 35 5.1 NAME SERVICE PROTOCOLS 35 5.1.1 B-NODE ACTIVITY 35 NetBIOS Working Group [Page 2]  RFC 1002 March 1987 5.1.1.1 B-NODE ADD NAME 35 5.1.1.2 B-NODE ADD_GROUP NAME 37 5.1.1.3 B-NODE FIND_NAME 37 5.1.1.4 B NODE NAME RELEASE 38 5.1.1.5 B-NODE INCOMING PACKET PROCESSING 39 5.1.2 P-NODE ACTIVITY 42 5.1.2.1 P-NODE ADD_NAME 42 5.1.2.2 P-NODE ADD GROUP NAME 45 5.1.2.3 P-NODE FIND NAME 45 5.1.2.4 P-NODE DELETE_NAME 46 5.1.2.5 P-NODE INCOMING PACKET PROCESSING 47 5.1.2.6 P-NODE TIMER INITIATED PROCESSING 49 5.1.3 M-NODE ACTIVITY 50 5.1.3.1 M-NODE ADD NAME 50 5.1.3.2 M-NODE ADD GROUP NAME 54 5.1.3.3 M-NODE FIND NAME 55 5.1.3.4 M-NODE DELETE NAME 56 5.1.3.5 M-NODE INCOMING PACKET PROCESSING 58 5.1.3.6 M-NODE TIMER INITIATED PROCESSING 60 5.1.4 NBNS ACTIVITY 60 5.1.4.1 NBNS INCOMING PACKET PROCESSING 61 5.1.4.2 NBNS TIMER INITIATED PROCESSING 66 5.2 SESSION SERVICE PROTOCOLS 67 5.2.1 SESSION ESTABLISHMENT PROTOCOLS 67 5.2.1.1 USER REQUEST PROCESSING 67 5.2.1.2 RECEIVED PACKET PROCESSING 71 5.2.2 SESSION DATA TRANSFER PROTOCOLS 72 5.2.2.1 USER REQUEST PROCESSING 72 5.2.2.2 RECEIVED PACKET PROCESSING 72 5.2.2.3 PROCESSING INITIATED BY TIMER 73 5.2.3 SESSION TERMINATION PROTOCOLS 73 5.2.3.1 USER REQUEST PROCESSING 73 5.2.3.2 RECEPTION INDICATION PROCESSING 73 5.3 NetBIOS DATAGRAM SERVICE PROTOCOLS 74 5.3.1 B NODE TRANSMISSION OF NetBIOS DATAGRAMS 74 5.3.2 P AND M NODE TRANSMISSION OF NetBIOS DATAGRAMS 76 5.3.3 RECEPTION OF NetBIOS DATAGRAMS BY ALL NODES 78 5.3.4 PROTOCOLS FOR THE NBDD 80 6. DEFINED CONSTANTS AND VARIABLES 83 REFERENCES 85 NetBIOS Working Group [Page 3]  RFC 1002 March 1987 PROTOCOL STANDARD FOR A NetBIOS SERVICE ON A TCP/UDP TRANSPORT: DETAILED SPECIFICATIONS 1. STATUS OF THIS MEMO This RFC specifies a proposed standard for the DARPA Internet community. Since this topic is new to the Internet community, discussions and suggestions are specifically requested. Please send written comments to: Karl Auerbach Epilogue Technology Corpo