Internet-Draft TCP MIB for IPv6 June 1997
Expires December 1997
IP Version 6 Management Information Base
for the Transmission Control Protocol
<draft-ietf-ipngwg-ipv6-tcp-mib-00.txt>
Mike Daniele
Digital Equipment Corporation
Status of this Memo
This document is an Internet-Draft. 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."
To view the entire list of current Internet-Drafts, please check
the "1id-abstracts.txt" listing contained in the Internet-Drafts
Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net
(Europe), munnari.oz.au (Pacific Rim), ds.internic.net (US East
Coast), or ftp.isi.edu (US West Coast).
Abstract
This document is one in the series of documents that define
various MIB objects for IPv6. Specifically, this document
is the MIB module which defines managed objects for
implementations of the Transmission Control Protocol (TCP)
over IP Version 6 (IPv6).
This document also recommends a specific policy with respect to
the applicability of RFC 2012 for implementations of IPv6.
Namely, the most of managed objects defined in RFC 2012 are
independent of which IP versions underly TCP, and only the
TCP connection information is IP version-specific.
This memo defines an experimental portion of the Management
Information Base (MIB) for use with network management
protocols in the IPv6-based internets.
1. Introduction
A management system contains: several (potentially many) nodes, each
with a processing entity, termed an agent, which has access to
management instrumentation; at least one management station; and, a
management protocol, used to convey management information between
the agents and management stations. Operations of the protocol are
carried out under an administrative framework which defines
authentication, authorization, access control, and privacy policies.
Management stations execute management applications which monitor and
control managed elements. Managed elements are devices such as
hosts, routers, terminal servers, etc., which are monitored and
controlled via access to their management information.
Management information is viewed as a collection of managed objects,
residing in a virtual information store, termed the Management
Information Base (MIB). Collections of related objects are defined
in MIB modules. These modules are written using a subset of OSI's
Abstract Syntax Notation One (ASN.1) [1], termed the Structure of
Management Information (SMI) [2].
2. Overview
This document is one in the series of documents that define various
MIB objects, and statements of conformance, for IPv6. This document
defines the required instrumentation for implementations of TCP over
IPv6.
3. Transparency of IP versions to TCP
The fact that a particular TCP connection uses IPv6 as opposed to
IPv4, is largely invisible to a TCP implementation. A "TCPng" did
not need to be defined, implementations simply need to support
IPv6 addresses.
As such, the managed objects already defined in [TCP MIB] are
sufficient for managing TCP in the presence of IPv6. These objects
are equally applicable whether the managed node supports IPv4 only,
IPv6 only, or both IPv4 and IPv6.
For example, tcpActiveOpens counts "The number of times TCP
connections have made a direct transition to the SYN-SENT state from
the CLOSED state", regardless of which version of IP is used between
the connection endpoints.
Stated differently, TCP implementations don't need separate counters
for IPv4 and for IPv6.
4. Representing TCP Connections
The exception to the statements in section 3 is the tcpConnTable.
Since IPv6 addresses cannot be represented with the IpAddress syntax,
not all TCP connections can be represented in the tcpConnTable
defined in [TCP MIB].
This memo defines a new, separate table to represent only those
TCP connections between IPv6 endpoints. TCP connections between
IPv4 endpoints continue to be represented in tcpConnTable [TCP MIB].
A different approach would have been to define a new table to
represent all TCP connections regardless of IP version. This would
require changes to [TCP MIB] and hence to existing (IPv4-only)
TCP implementations. The approach suggested in this memo has the
advantage of leaving [TCP MIB] intact.
5. Conformance
This memo contains conformance statements to define conformance
to this MIB for TCP over IPv6 implementations. Conformance is
defined in terms of both the new TCP connection table defined here,
and the objects defined in [TCP MIB].
6. Definitions
IPV6-TCP-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
Unsigned32, Gauge32, Counter32,
Integer32 FROM SNMPv2-SMI
Ipv6, Ipv6Address,
Ipv6IfIndex, Ipv6IfIndexOrZero FROM IPV6-TC
tcpRtoAlgorithm, tcpRtoMin,
tcpRtoMax, tcpMaxConn, tcpActiveOpens,
tcpPassiveOpens, tcpAttemptFails,
tcpEstabResets, tcpCurrEstab, tcpInSegs,
tcpOutSegs, tcpRetransSegs,
tcpInErrs, tcpOutRsts FROM TCP-MIB;
ipv6TcpMIB MODULE-IDENTITY
LAST-UPDATED "9706090000Z"
ORGANIZATION "IETF IPv6 MIB Working Group"
CONTACT-INFO
" Mike Daniele
Postal: Digital Equipment Corporation
110 Spitbrook Rd
Nashua, NH 03062.
US
Phone: +1 603 881 1423
Email: daniele@zk3.dec.com"
DESCRIPTION
"The MIB module for entities implementing TCP
over IPv6."
::= { ipv6 4}
-- objects specific to TCP for IPv6
ipv6TcpMIBObjects OBJECT IDENTIFIER ::= { ipv6TcpMIB 1 }
-- the TCP over IPv6 Connection table
-- This connection table contains information about this
-- entity's existing TCP connections between IPv6 endpoints.
-- Only connections between IPv6 addresses are contained in
-- this table. This entity's connections between IPv4
-- endpoints are contained in tcpConnTable.
ipv6TcpConnTable OBJECT-TYPE
SYNTAX SEQUENCE OF Ipv6TcpConnEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing TCP connection-specific
information, for only those connections whose endpoints
are IPv6 addresses."
::= { ipv6TcpMIBObjects 1 } -- eventually to be { tcp 16 }?
ipv6TcpConnEntry OBJECT-TYPE
SYNTAX Ipv6TcpConnEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A conceptual row of the ipv6TcpConnTable 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.
Note that conceptual rows in this table require an additional
index object compared to tcpConnTable, since IPv6 addresses
are not guaranteed to be unique on the managed node."
INDEX { ipv6TcpConnLocalAddress,
ipv6TcpConnLocalPort,
ipv6TcpConnRemAddress,
ipv6TcpConnRemPort,
ipv6TcpConnIfIndex }
::= { ipv6TcpConnTable 1 }
Ipv6TcpConnEntry ::=
SEQUENCE {
ipv6TcpConnLocalAddress Ipv6Address,
ipv6TcpConnLocalPort INTEGER (0..65535),
ipv6TcpConnRemAddress Ipv6Address,
ipv6TcpConnRemPort INTEGER (0..65535),
ipv6TcpConnIfIndex Ipv6IfIndexOrZero,
ipv6TcpConnState INTEGER
}
ipv6TcpConnLocalAddress OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local IPv6 address for this TCP connection. In
the case of a connection in the listen state which
is willing to accept connections for any IPv6
address associated with the managed node, the value
::0 is used."
::= { ipv6TcpConnEntry 1 }
ipv6TcpConnLocalPort OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local port number for this TCP connection."
::= { ipv6TcpConnEntry 2 }
ipv6TcpConnRemAddress OBJECT-TYPE
SYNTAX Ipv6Address
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote IPv6 address for this TCP connection."
::= { ipv6TcpConnEntry 3 }
ipv6TcpConnRemPort OBJECT-TYPE
SYNTAX INTEGER (0..65535)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote port number for this TCP connection."
::= { ipv6TcpConnEntry 4 }
ipv6TcpConnIfIndex OBJECT-TYPE
SYNTAX Ipv6IfIndexOrZero
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An index object used to disambiguate conceptual rows in
the table, since the connection 4-tuple may not be unique.
If the connection's remote address (ipv6TcpConnRemAddress)
is a link-local address and the connection's local address
(ipv6TcpConnLocalAddress) is not a link-local address, this
object identifies a local interface on the same link as
the connection's remote link-local address.
Otherwise, this object identifies the local interface that
is associated with the ipv6TcpConnLocalAddress for this
TCP connection. If such a local interface cannot be determined,
this object should take on the value 0. (A possible example
of this would be if the value of ipv6TcpConnLocalAddress is ::0.)
The interface identified by a particular non-0 value of this
index is the same interface as identified by the same value
of ipv6IfIndex.
The value of this object must remain constant during the life
of the TCP connection."
::= { ipv6TcpConnEntry 5 }
ipv6TcpConnState 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 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)."
::= { ipv6TcpConnEntry 6 }
--
-- conformance information
--
ipv6TcpConformance OBJECT IDENTIFIER ::= { ipv6TcpMIB 2 }
ipv6TcpCompliances OBJECT IDENTIFIER ::= { ipv6TcpConformance 1 }
ipv6TcpGroups OBJECT IDENTIFIER ::= { ipv6TcpConformance 2 }
-- compliance statements
ipv6TcpCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMPv2 entities which
implement TCP over IPv6."
MODULE -- this module
MANDATORY-GROUPS { ipv6TcpGroup }
::= { ipv6TcpCompliances 1 }
ipv6TcpGroup OBJECT-GROUP
OBJECTS { -- these are defined in TCP-MIB
tcpRtoAlgorithm,
tcpRtoMin,
tcpRtoMax,
tcpMaxConn,
tcpActiveOpens,
tcpPassiveOpens,
tcpAttemptFails,
tcpEstabResets,
tcpCurrEstab,
tcpInSegs,
tcpOutSegs,
tcpRetransSegs,
tcpInErrs,
tcpOutRsts,
-- these are defined in this module
ipv6TcpConnState
}
STATUS current
DESCRIPTION
"The group of objects providing management of
TCP over IPv6."
::= { ipv6TcpGroups 1 }
END
7. Acknowledgments
This memo is a product of the IPng work group, and benefited especially
from the contributions of the following working group members:
Dimitry Haskin Bay Networks
Margaret Forsythe Epilogue
Tim Hartrick Mentat
Frank Solensky FTP
Jack Mccann DEC
8. References
[1] Information processing systems - Open Systems Interconnection -
Specification of Abstract Syntax Notation One (ASN.1),
International Organization for Standardization. International
Standard 8824, (December, 1987).
[2] McCloghrie, K., Editor, "Structure of Management Information
for version 2 of the Simple Network Management Protocol
(SNMPv2)", RFC 1902, Cisco Systems, January 1996.
[TCP MIB]
SNMPv2 Working Group, McCloghrie, K., Editor,
"SNMPv2 Management Information Base for the Transmission
Control Protocol using SMIv2", RFC 2012, November 1996.
[IPV6 MIB TC]
Haskin, D., and S. Onishi, "Management Information Base
for IP Version 6: Textual Conventions and General Group",
Work in progress.
[IPV6]
Deering, S., and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 1883, December 1995.
9. Security Considerations
Certain management information defined in this MIB may be
considered sensitive in some network environments.
Therefore, authentication of received SNMP requests and
controlled access to management information should be employed
in such environments.
10. Author's Address
Mike Daniele
Digital Equipment Corporation
110 Spit Brook Rd
Nashua, NH 03062
Phone: +1-603-881-1423
EMail: daniele@zk3.dec.com
Expires December 1997
Datatracker
Report a datatracker bug
draft-ietf-ipngwg-ipv6-tcp-mib-00
Internet-Draft
| Document | Document type |
This is an older version of an Internet-Draft that was ultimately published as RFC 2452.
Expired & archived
|
|
|---|---|---|---|
| Select version | |||
| Compare versions | |||
| Author | |||
| RFC stream |
|
||
| Other formats | |||
| Additional resources | Mailing list discussion |