IPv6 MIB Revision Design Team Bill Fenner INTERNET-DRAFT AT&T Research Expires: May 2002 Brian Haberman Nortel Networks Keith McCloghrie Cisco Systems Juergen Schoenwalder TU Braunschweig Dave Thaler Microsoft November 2001 Management Information Base for the Transmission Control Protocol (TCP) draft-ietf-ipngwg-rfc2012-update-01.txt Status of this Document This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This document is a product of the IPv6 MIB Revision Design Team. Comments should be addressed to the authors, or the mailing list at ipng@sunroof.eng.sun.com. Copyright Notice Copyright (C) The Internet Society (2001). All Rights Reserved. Fenner [Page 1] INTERNET-DRAFT Expires: May 2002 November 2001 Abstract This memo defines a portion of the Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects used for implementations of the Transmission Control Protocol (TCP) [5] in an IP version independent manner. Fenner [Page 2] INTERNET-DRAFT Expires: May 2002 November 2001 Table of Contents 1. The SNMP Management Framework . . . . . . . . . . . . . . . . . . 3 2. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . 4 3. MIB Structure . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5. Open Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6. Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . . . 23 7. References. . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8. Security Considerations . . . . . . . . . . . . . . . . . . . . . 25 9. Editor's Address. . . . . . . . . . . . . . . . . . . . . . . . . 25 10. Full Copyright Statement . . . . . . . . . . . . . . . . . . . . 26 1. The SNMP Management Framework The SNMP Management Framework presently consists of five major components: o An overall architecture, described in RFC 2571 [7]. o Mechanisms for describing and naming objects and events for the purpose of management. The first version of this Structure of Management Information (SMI) is called SMIv1 and described in STD 16, RFC 1155 [8], STD 16, RFC 1212 [9] and RFC 1215 [10]. The second version, called SMIv2, is described in STD 58, RFC 2578 [11], STD 58, RFC 2579 [12] and STD 58, RFC 2580 [13]. o Message protocols for transferring management information. The first version of the SNMP message protocol is called SNMPv1 and described in STD 15, RFC 1157 [14]. A second version of the SNMP message protocol, which is not an Internet standards track protocol, is called SNMPv2c and described in RFC 1901 [15] and RFC 1906 [16]. The third version of the message protocol is called SNMPv3 and described in RFC 1906 [16], RFC 2572 [17] and RFC 2574 [18]. o Protocol operations for accessing management information. The first set of protocol operations and associated PDU formats is described in STD 15, RFC 1157 [14]. A second set of protocol operations and associated PDU formats is described in RFC 1905 [19]. o A set of fundamental applications described in RFC 2573 [20] and the view-based access control mechanism described in RFC 2575 [21]. A more detailed introduction to the current SNMP Management Framework can be found in RFC 2570 [22]. Fenner Section 1. [Page 3] INTERNET-DRAFT Expires: May 2002 November 2001 Managed objects are accessed via a virtual information store, termed the Management Information Base or MIB. Objects in the MIB are defined using the mechanisms defined in the SMI. This memo specifies a MIB module that is compliant to the SMIv2. A MIB conforming to the SMIv1 can be produced through the appropriate translations. The resulting translated MIB must be semantically equivalent, except where objects or events are omitted because no translation is possible (use of Counter64). Some machine readable information in SMIv2 will be converted into textual descriptions in SMIv1 during the translation process. However, this loss of machine readable information is not considered to change the semantics of the MIB. 2. Revision History Changes from draft-ietf-ipngwg-rfc2012-update-00.txt: 14 November 2001 Added HC versions of connection counters. Added Listener table, with counters for accepted and timed out connection attempts. Added tcp{Connection,Listener}ProcessID to index into SYSAPPL-MIB or HOST-RESOURCES-MIB. Removed tcpConnectionRemAddrType, it must be the same as tcpConnectionLocalAddrType. Changes from draft-ops-rfc2012-update-00.txt 12 Jul 2001 Turned into IPNG WG document Added tcpCountersGroup for per-connection counters Changes from first draft posted to v6mib mailing list: 23 Feb 2001 Made threshold for HC packet counters 1Mpps Added copyright statements and table of contents Fenner Section 2. [Page 4] INTERNET-DRAFT Expires: May 2002 November 2001 21 Feb 2001 -- Juergen's changes Renamed tcpInetConn* to tcpConnection* Updated Conformance info Added missing tcpConnectionState and tcpConnState objects to SEQUENCEs 6 Feb 2001 Removed v6-only objects. Renamed inetTcp* to tcpInet* Added SIZE restriction to InetAddress index objects. (36 = 32-byte addresses plus 4-byte scope, but it's just a strawman) Used InetPortNumber TC from updated INET-ADDRESS-MIB Updated compliance statements. Added Keith to authors Added open issues section. Changes from RFC 2012 Deprecated tcpConnTable Added tcpConnectionTable 3. MIB Structure (Obviously this section needs a lot of work) Addresses are as seen on the wire, not necessarily as the socket sees them (e.g. IPv4 address, not IPv6-mapped IPv4) Listener on in6addr_any without IPV6_V6ONLY socket option set (i.e. willing to accept v4 or v6) is indicated by remote AF = unknown. 4. Definitions TCP-MIB DEFINITIONS ::= BEGIN Fenner Section 4. [Page 5] INTERNET-DRAFT Expires: May 2002 November 2001 IMPORTS MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32, Gauge32, Counter32, Counter64, IpAddress, mib-2 FROM SNMPv2-SMI TimeStamp FROM SNMPv2-TC MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF InetAddress, InetAddressType, InetPortNumber FROM INET-ADDRESS-MIB; tcpMIB MODULE-IDENTITY LAST-UPDATED "200111140000Z" ORGANIZATION "IETF IPv6 MIB Revision Team" CONTACT-INFO "Bill Fenner (editor) AT&T Labs -- Research 75 Willow Rd. Menlo Park, CA 94025 Phone: +1 650 330-7893 Email: " DESCRIPTION "The MIB module for managing TCP implementations." REVISION "200111140000Z" DESCRIPTION "IP version neutral revision, published as RFC XXXX." REVISION "9411010000Z" DESCRIPTION "Initial SMIv2 version, published as RFC 2012." REVISION "9103310000Z" DESCRIPTION "The initial revision of this MIB module was part of MIB-II." ::= { mib-2 49 } -- the TCP base variables group tcp OBJECT IDENTIFIER ::= { mib-2 6 } -- Scalars tcpRtoAlgorithm OBJECT-TYPE SYNTAX INTEGER { other(1), -- none of the following constant(2), -- a constant rto rsre(3), -- MIL-STD-1778, Appendix B vanj(4) -- Van Jacobson's algorithm [1] } Fenner Section 4. [Page 6] INTERNET-DRAFT Expires: May 2002 November 2001 MAX-ACCESS read-only STATUS current DESCRIPTION "The algorithm used to determine the timeout value used for retransmitting unacknowledged octets." ::= { tcp 1 } tcpRtoMin OBJECT-TYPE SYNTAX Integer32 UNITS "milliseconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The minimum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the semantics of the LBOUND quantity described in RFC 793." ::= { tcp 2 } tcpRtoMax OBJECT-TYPE SYNTAX Integer32 UNITS "milliseconds" MAX-ACCESS read-only STATUS current DESCRIPTION "The maximum value permitted by a TCP implementation for the retransmission timeout, measured in milliseconds. More refined semantics for objects of this type depend upon the algorithm used to determine the retransmission timeout. In particular, when the timeout algorithm is rsre(3), an object of this type has the semantics of the UBOUND quantity described in RFC 793." ::= { tcp 3 } tcpMaxConn OBJECT-TYPE SYNTAX Integer32 MAX-ACCESS read-only STATUS current DESCRIPTION "The limit on the total number of TCP connections the entity can support. In entities where the maximum number of connections is dynamic, this object should contain the value -1." ::= { tcp 4 } Fenner Section 4. [Page 7] INTERNET-DRAFT Expires: May 2002 November 2001 tcpActiveOpens OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times TCP connections have made a direct transition to the SYN-SENT state from the CLOSED state." ::= { tcp 5 } tcpPassiveOpens OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times TCP connections have made a direct transition to the SYN-RCVD state from the LISTEN state." ::= { tcp 6 } tcpAttemptFails OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times TCP connections have made a direct transition to the CLOSED state from either the SYN-SENT state or the SYN-RCVD state, plus the number of times TCP connections have made a direct transition to the LISTEN state from the SYN-RCVD state." ::= { tcp 7 } tcpEstabResets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of times TCP connections have made a direct transition to the CLOSED state from either the ESTABLISHED state or the CLOSE-WAIT state." ::= { tcp 8 } tcpCurrEstab OBJECT-TYPE SYNTAX Gauge32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of TCP connections for which the current state is either ESTABLISHED or CLOSE-WAIT." ::= { tcp 9 } Fenner Section 4. [Page 8] INTERNET-DRAFT Expires: May 2002 November 2001 tcpInSegs OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments received, including those received in error. This count includes segments received on currently established connections." ::= { tcp 10 } tcpOutSegs OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments sent, including those on current connections but excluding those containing only retransmitted octets." ::= { tcp 11 } tcpRetransSegs OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments retransmitted - that is, the number of TCP segments transmitted containing one or more previously transmitted octets." ::= { tcp 12 } tcpInErrs OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments received in error (e.g., bad TCP checksums)." ::= { tcp 14 } tcpOutRsts OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of TCP segments sent containing the RST flag." ::= { tcp 15 } tcpHCInSegs OBJECT-TYPE Fenner Section 4. [Page 9] INTERNET-DRAFT Expires: May 2002 November 2001 SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments received, including those received in error, on systems that can receive more than 1 million TCP packets per second. This count includes segments received on currently established connections." ::= { tcp 17 } tcpHCOutSegs OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The total number of segments sent, including those on current connections but excluding those containing only retransmitted octets, on systems that can transmit more than 1 million TCP packets per second." ::= { tcp 18 } -- The TCP Connection table tcpConnectionTable OBJECT-TYPE SYNTAX SEQUENCE OF TcpConnectionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table containing information about existing TCP connections. Note that unlike earlier TCP MIBs, there is a seperate table for connections in the LISTEN state." ::= { tcp 19 } tcpConnectionEntry OBJECT-TYPE SYNTAX TcpConnectionEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A conceptual row of the tcpConnectionTable containing information about a particular current TCP connection. Each row of this table is transient, in that it ceases to exist when (or soon after) the connection makes the transition to the CLOSED state." INDEX { tcpConnectionLocalAddressType, tcpConnectionLocalAddress, tcpConnectionLocalPort, tcpConnectionRemAddress, tcpConnectionRemPort } Fenner Section 4. [Page 10] INTERNET-DRAFT Expires: May 2002 November 2001 ::= { tcpConnectionTable 1 } TcpConnectionEntry ::= SEQUENCE { tcpConnectionLocalAddressType InetAddressType, tcpConnectionLocalAddress InetAddress, tcpConnectionLocalPort InetPortNumber, tcpConnectionRemAddress InetAddress, tcpConnectionRemPort InetPortNumber, tcpConnectionState INTEGER, tcpConnectionInPackets Counter32, tcpConnectionOutPackets Counter32, tcpConnectionInOctets Counter32, tcpConnectionOutOctets Counter32, tcpConnectionHCInPackets Counter64, tcpConnectionHCOutPackets Counter64, tcpConnectionHCInOctets Counter64, tcpConnectionHCOutOctets Counter64, tcpConnectionStartTime TimeStamp, tcpConnectionProcessID Unsigned32 } tcpConnectionLocalAddressType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION "The address type of tcpConnectionLocalAddress. Only IPv4 and IPv6 addresses are expected." ::= { tcpConnectionEntry 1 } tcpConnectionLocalAddress OBJECT-TYPE SYNTAX InetAddress (SIZE(0..36)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The local IP address for this TCP connection. In the case of a connection in the listen state which is willing to accept connections for any IP interface associated with the node, a value of all zeroes is used." ::= { tcpConnectionEntry 2 } tcpConnectionLocalPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS not-accessible STATUS current DESCRIPTION "The local port number for this TCP connection." ::= { tcpConnectionEntry 3 } Fenner Section 4. [Page 11] INTERNET-DRAFT Expires: May 2002 November 2001 tcpConnectionRemAddress OBJECT-TYPE SYNTAX InetAddress (SIZE(0..36)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The remote IP address for this TCP connection." ::= { tcpConnectionEntry 4 } tcpConnectionRemPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS not-accessible STATUS current DESCRIPTION "The remote port number for this TCP connection." ::= { tcpConnectionEntry 5 } tcpConnectionState OBJECT-TYPE SYNTAX INTEGER { closed(1), listen(2), synSent(3), synReceived(4), established(5), finWait1(6), finWait2(7), closeWait(8), lastAck(9), closing(10), timeWait(11), deleteTCB(12) } MAX-ACCESS read-write STATUS current DESCRIPTION "The state of this TCP connection. The value listen(2) is included only for parallelism to the old tcpConnTable, and should not be used. A connection in LISTEN state should be present in the tcpListenerTable. The only value which may be set by a management station is deleteTCB(12). Accordingly, it is appropriate for an agent to return a `badValue' response if a management station attempts to set this object to any other value. If a management station sets this object to the value deleteTCB(12), then this has the effect of deleting the TCB (as defined in RFC 793) of the corresponding connection on Fenner Section 4. [Page 12] INTERNET-DRAFT Expires: May 2002 November 2001 the managed node, resulting in immediate termination of the connection. As an implementation-specific option, a RST segment may be sent from the managed node to the other TCP endpoint (note however that RST segments are not sent reliably)." ::= { tcpConnectionEntry 6 } tcpConnectionInPackets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets received on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 7 } tcpConnectionOutPackets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets transmitted on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 8 } tcpConnectionInOctets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets received on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 9 } tcpConnectionOutOctets OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets transmitted on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 10 } tcpConnectionHCInPackets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current Fenner Section 4. [Page 13] INTERNET-DRAFT Expires: May 2002 November 2001 DESCRIPTION "The number of packets received on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 11 } tcpConnectionHCOutPackets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of packets transmitted on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 12 } tcpConnectionHCInOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets received on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 13 } tcpConnectionHCOutOctets OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of octets transmitted on this connection. This count includes retransmitted data." ::= { tcpConnectionEntry 14 } tcpConnectionStartTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time this connection was established" ::= { tcpConnectionEntry 15 } tcpConnectionProcessID OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "The system's process ID for the process associated with this connection, or zero if there is no such process. This value Fenner Section 4. [Page 14] INTERNET-DRAFT Expires: May 2002 November 2001 is expected to be the same as HOST-RESOURCES- MIB::hrSWRunIndex or SYSAPPL-MIB::sysApplElmtRunIndex for some row in the appropriate tables." ::= { tcpConnectionEntry 16 } -- The TCP Listener table tcpListenerTable OBJECT-TYPE SYNTAX SEQUENCE OF TcpListenerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A table containing information about TCP listeners." ::= { tcp 20 } tcpListenerEntry OBJECT-TYPE SYNTAX TcpListenerEntry MAX-ACCESS not-accessible STATUS current DESCRIPTION "A conceptual row of the tcpListenerTable containing information about a particular TCP listener." INDEX { tcpListenerLocalAddressType, tcpListenerLocalAddress, tcpListenerLocalPort, tcpListenerRemAddressType } ::= { tcpListenerTable 1 } TcpListenerEntry ::= SEQUENCE { tcpListenerLocalAddressType InetAddressType, tcpListenerLocalAddress InetAddress, tcpListenerLocalPort InetPortNumber, tcpListenerRemAddressType InetAddressType, tcpListenerConnectionsTimedOut Counter32, tcpListenerHCConnectionsTimedOut Counter64, tcpListenerConnectionsAccepted Counter32, tcpListenerHCConnectionsAccepted Counter64, tcpListenerStartTime TimeStamp, tcpListenerProcessID Unsigned32 } tcpListenerLocalAddressType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS not-accessible STATUS current DESCRIPTION Fenner Section 4. [Page 15] INTERNET-DRAFT Expires: May 2002 November 2001 "The address type of tcpListenerLocalAddress. Only IPv4 and IPv6 addresses are expected." ::= { tcpListenerEntry 1 } tcpListenerLocalAddress OBJECT-TYPE SYNTAX InetAddress (SIZE(0..36)) MAX-ACCESS not-accessible STATUS current DESCRIPTION "The local IP address for this TCP connection. In the case of a connection in the listen state which is willing to accept connections for any IP interface associated with the node, a value of all zeroes is used." ::= { tcpListenerEntry 2 } tcpListenerLocalPort OBJECT-TYPE SYNTAX InetPortNumber MAX-ACCESS not-accessible STATUS current DESCRIPTION "The local port number for this TCP connection." ::= { tcpListenerEntry 3 } tcpListenerRemAddressType OBJECT-TYPE SYNTAX InetAddressType MAX-ACCESS read-only STATUS current DESCRIPTION "The address type of connections that will be accepted by this listener. Only IPv4 and IPv6 addresses are expected, or unknown to indicate an endpoint willing to accept both IPv4 and IPv6 connections." ::= { tcpListenerEntry 4 } tcpListenerConnectionsTimedOut OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of connection attempts to this endpoint which have failed due to timeout of the three-way handshake, i.e. the row was removed from the tcpConnectionTable but tcpConnectionState never moved from synReceived to established." ::= { tcpListenerEntry 5 } tcpListenerHCConnectionsTimedOut OBJECT-TYPE SYNTAX Counter64 Fenner Section 4. [Page 16] INTERNET-DRAFT Expires: May 2002 November 2001 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of connection attempts to this endpoint which have failed due to timeout of the three-way handshake, i.e. the row was removed from the tcpConnectionTable but tcpConnectionState never moved from synReceived to established." ::= { tcpListenerEntry 6 } tcpListenerConnectionsAccepted OBJECT-TYPE SYNTAX Counter32 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of connections which have been established to this endpoint." ::= { tcpListenerEntry 7 } tcpListenerHCConnectionsAccepted OBJECT-TYPE SYNTAX Counter64 MAX-ACCESS read-only STATUS current DESCRIPTION "The number of connections which have been established to this endpoint." ::= { tcpListenerEntry 8 } tcpListenerStartTime OBJECT-TYPE SYNTAX TimeStamp MAX-ACCESS read-only STATUS current DESCRIPTION "The value of sysUpTime at the time this listener was established." ::= { tcpListenerEntry 9 } tcpListenerProcessID OBJECT-TYPE SYNTAX Unsigned32 MAX-ACCESS read-only STATUS current DESCRIPTION "The system's process ID for the process associated with this listener, or zero if there is no such process. This value is expected to be the same as HOST-RESOURCES- MIB::hrSWRunIndex or SYSAPPL-MIB::sysApplElmtRunIndex for some row in the appropriate tables." ::= { tcpListenerEntry 10 } Fenner Section 4. [Page 17] INTERNET-DRAFT Expires: May 2002 November 2001 -- The deprecated TCP Connection table tcpConnTable OBJECT-TYPE SYNTAX SEQUENCE OF TcpConnEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "A table containing information about existing IPv4-specific TCP connections or listeners. This table has been deprecated in favor of the version neutral tcpConnectionTable." ::= { tcp 13 } tcpConnEntry OBJECT-TYPE SYNTAX TcpConnEntry MAX-ACCESS not-accessible STATUS deprecated DESCRIPTION "A conceptual row of the tcpConnTable containing information about a particular current IPv4 TCP connection. Each row of this table is transient, in that it ceases to exist when (or soon after) the connection makes the transition to the CLOSED state." INDEX { tcpConnLocalAddress, tcpConnLocalPort, tcpConnRemAddress, tcpConnRemPort } ::= { tcpConnTable 1 } TcpConnEntry ::= SEQUENCE { tcpConnState INTEGER, tcpConnLocalAddress IpAddress, tcpConnLocalPort INTEGER, tcpConnRemAddress IpAddress, tcpConnRemPort INTEGER } tcpConnState OBJECT-TYPE SYNTAX INTEGER { closed(1), listen(2), synSent(3), synReceived(4), established(5), finWait1(6), finWait2(7), closeWait(8), lastAck(9), Fenner Section 4. [Page 18] INTERNET-DRAFT Expires: May 2002 November 2001 closing(10), timeWait(11), deleteTCB(12) } MAX-ACCESS read-write STATUS deprecated DESCRIPTION "The state of this TCP connection. The only value which may be set by a management station is deleteTCB(12). Accordingly, it is appropriate for an agent to return a `badValue' response if a management station attempts to set this object to any other value. If a management station sets this object to the value deleteTCB(12), then this has the effect of deleting the TCB (as defined in RFC 793) of the corresponding connection on the managed node, resulting in immediate termination of the connection. As an implementation-specific option, a RST segment may be sent from the managed node to the other TCP endpoint (note however that RST segments are not sent reliably)." ::= { tcpConnEntry 1 } tcpConnLocalAddress OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-only STATUS deprecated DESCRIPTION "The local IP address for this TCP connection. In the case of a connection in the listen state which is willing to accept connections for any IP interface associated with the node, the value 0.0.0.0 is used." ::= { tcpConnEntry 2 } tcpConnLocalPort OBJECT-TYPE SYNTAX INTEGER (0..65535) MAX-ACCESS read-only STATUS deprecated DESCRIPTION "The local port number for this TCP connection." ::= { tcpConnEntry 3 } tcpConnRemAddress OBJECT-TYPE SYNTAX IpAddress MAX-ACCESS read-only STATUS deprecated Fenner Section 4. [Page 19] INTERNET-DRAFT Expires: May 2002 November 2001 DESCRIPTION "The remote IP address for this TCP connection." ::= { tcpConnEntry 4 } tcpConnRemPort OBJECT-TYPE SYNTAX INTEGER (0..65535) MAX-ACCESS read-only STATUS deprecated DESCRIPTION "The remote port number for this TCP connection." ::= { tcpConnEntry 5 } -- conformance information tcpMIBConformance OBJECT IDENTIFIER ::= { tcpMIB 2 } tcpMIBCompliances OBJECT IDENTIFIER ::= { tcpMIBConformance 1 } tcpMIBGroups OBJECT IDENTIFIER ::= { tcpMIBConformance 2 } -- compliance statements tcpMIBCompliance2 MODULE-COMPLIANCE STATUS current DESCRIPTION "The compliance statement for systems which implement TCP." MODULE -- this module MANDATORY-GROUPS { tcpBaseGroup, tcpConnectionGroup, tcpListenerGroup } GROUP tcpHCGroup DESCRIPTION "This group is mandatory for those systems which are capable of receiving or transmitting more than 1 million TCP packets per second. 1 million packets per second will cause a Counter32 to wrap in just over an hour." GROUP tcpStatisticsGroup DESCRIPTION "This group is optional. It provides visibility for counters that some systems already implement." GROUP tcpHCStatisticsGroup DESCRIPTION "This group is mandatory for those systems which implement the tcpStatisticsGroup and are capable of receiving or transmitting more than 1 million TCP packets per second. 1 million packets per second will cause a Counter32 to wrap in just over an hour." Fenner Section 4. [Page 20] INTERNET-DRAFT Expires: May 2002 November 2001 OBJECT tcpConnectionState MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { tcpMIBCompliances 2 } tcpMIBCompliance MODULE-COMPLIANCE STATUS deprecated DESCRIPTION "The compliance statement for IPv4-only systems which implement TCP. In order to be IP version independent, this compliance statement is deprecated in favor of tcpMIBCompliance2. However, agents are still encouraged to implement these objects in order to interoperate with the deployed base of managers." MODULE -- this module MANDATORY-GROUPS { tcpGroup } OBJECT tcpConnState MIN-ACCESS read-only DESCRIPTION "Write access is not required." ::= { tcpMIBCompliances 1 } -- units of conformance tcpGroup OBJECT-GROUP OBJECTS { tcpRtoAlgorithm, tcpRtoMin, tcpRtoMax, tcpMaxConn, tcpActiveOpens, tcpPassiveOpens, tcpAttemptFails, tcpEstabResets, tcpCurrEstab, tcpInSegs, tcpOutSegs, tcpRetransSegs, tcpConnState, tcpConnLocalAddress, tcpConnLocalPort, tcpConnRemAddress, tcpConnRemPort, tcpInErrs, tcpOutRsts } STATUS deprecated DESCRIPTION "The tcp group of objects providing for management of TCP entities." ::= { tcpMIBGroups 1 } tcpBaseGroup OBJECT-GROUP OBJECTS { tcpRtoAlgorithm, tcpRtoMin, tcpRtoMax, tcpMaxConn, tcpActiveOpens, tcpPassiveOpens, tcpAttemptFails, tcpEstabResets, tcpCurrEstab, tcpInSegs, tcpOutSegs, tcpRetransSegs, tcpInErrs, tcpOutRsts } STATUS current Fenner Section 4. [Page 21] INTERNET-DRAFT Expires: May 2002 November 2001 DESCRIPTION "The group of counters common to TCP entities." ::= { tcpMIBGroups 2 } tcpHCGroup OBJECT-GROUP OBJECTS { tcpHCInSegs, tcpHCOutSegs } STATUS current DESCRIPTION "The group of objects providing for counters of high speed TCP implementations." ::= { tcpMIBGroups 3 } tcpConnectionGroup OBJECT-GROUP OBJECTS { tcpConnectionState } STATUS current DESCRIPTION "The table of TCP connections." ::= { tcpMIBGroups 4 } tcpListenerGroup OBJECT-GROUP OBJECTS { tcpListenerRemAddressType } STATUS current DESCRIPTION "The table of TCP listeners." ::= { tcpMIBGroups 5 } tcpStatisticsGroup OBJECT-GROUP OBJECTS { tcpConnectionInPackets, tcpConnectionOutPackets, tcpConnectionInOctets, tcpConnectionOutOctets, tcpConnectionStartTime, tcpConnectionProcessID, tcpListenerConnectionsTimedOut, tcpListenerConnectionsAccepted, tcpListenerStartTime, tcpListenerProcessID } STATUS current DESCRIPTION "The packet and octet counters and other statistics specific to a TCP connection or listener." ::= { tcpMIBGroups 6 } tcpHCStatisticsGroup OBJECT-GROUP OBJECTS { tcpConnectionHCInPackets, tcpConnectionHCOutPackets, tcpConnectionHCInOctets, tcpConnectionHCOutOctets, tcpListenerHCConnectionsTimedOut, tcpListenerHCConnectionsAccepted } STATUS current DESCRIPTION "The group of objects providing for statistics for listeners or connections on high speed TCP implementations." Fenner Section 4. [Page 22] INTERNET-DRAFT Expires: May 2002 November 2001 ::= { tcpMIBGroups 7 } END 5. Open Issues Why is tcpListenerRemoteAddressType = unknown better than tcpListenerLocalAddressType = unknown and tcpListenerLocalAddress = ''h? Then we could get rid of tcpListenerRemoteAddressType. Is tcp*ProcessID OK? Should there be an OID pointer into a row of some *Run* table? Are the current per-connection byte/segment counters appropriate? Other stats? [in optional conformance group] ConnSRTT? More HC counters? 6. Acknowledgements This document contains a modified subset of RFC 1213 and updates RFC 2012 and RFC 2452. 7. References [2] Rose, M. and K. McCloghrie, "Management Information Base for Network Management of TCP/IP-based internets", RFC 1213, March 1991. [3] K. McCloghrie, "SNMPv2 Management Information Base for the Transmission Control Protocol using SMIv2", RFC 2012, November 1996. [4] Haskin, D. and S. Onishi, "IP Version 6 Management Information Base for the Transmission Control Protocol", RFC 2452, December 1998. [5] Postel, J., "Transmission Control Protocol - DARPA Internet Program Protocol Specification", STD 7, RFC 793, DARPA, September 1981. [6] Jacobson, V., "Congestion Avoidance and Control", SIGCOMM 1988, Stanford, California. [7] Harrington, D., Presuhn, R., and B. Wijnen, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, April 1999. Fenner Section 7. [Page 23] INTERNET-DRAFT Expires: May 2002 November 2001 [8] Rose, M., and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990. [9] Rose, M., and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991. [10] Rose, M., "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991. [11] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999. [12] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999. [13] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J., Rose, M., and S. Waldbusser, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999. [14] Case, J., Fedor, M., Schoffstall, M., and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990. [15] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996. [16] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996. [17] Case, J., Harrington D., Presuhn R., and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, April 1999. [18] Blumenthal, U., and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, April 1999. [19] Case, J., McCloghrie, K., Rose, M., and S. Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996. [20] Levi, D., Meyer, P., and B. Stewart, "SNMPv3 Applications", RFC 2573, April 1999. Fenner Section 7. [Page 24] INTERNET-DRAFT Expires: May 2002 November 2001 [21] Wijnen, B., Presuhn, R., and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, April 1999. [22] Case, J., Mundy, R., Partain, D., and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", RFC 2570, April 1999. 8. Security Considerations There are a number of management objects defined in this MIB that have a MAX-ACCESS clause of read-write and/or read-create. Such objects may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations. There are a number of managed objects in this MIB that may contain sensitive information. These are: o The tcpConnectionLocalPort and tcpConnLocalPort objects can be used to identify what ports are open on the machine and can thus what attacks are likely to succeed, without the attacker having to run a port scanner. o The tcpConnectionState and tcpConnState objects have a MAX-ACCESS clause of read-write, which allows termination of an arbitrary connection. Unauthorized access could cause a denial of service. It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment. SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB. It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User- based Security Model RFC 2574 [18] and the View-based Access Control Model RFC 2575 [21] is recommended. It is then a customer/user responsibility to ensure that the SNMP entity giving access to an instance of this MIB, is properly configured to give Fenner Section 8. [Page 25] INTERNET-DRAFT Expires: May 2002 November 2001 access to the objects only to those principals (users) that have legitimate rights to indeed GET or SET (change/create/delete) them. 9. Editor's Address Bill Fenner AT&T Labs -- Research 75 Willow Rd Menlo Park, CA 94025 USA Email: fenner@research.att.com 10. Full Copyright Statement Copyright (C) The Internet Society (2001). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of developing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. 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