Network Working Group B. Fenner

Network Working Group B. Fenner
Request for Comments: 4113 AT&T Labs - Research
Obsoletes: 2454, 2013 J. Flick
Category: Standards Track Hewlett-Packard Company
June 2005

Management Information Base for the User Datagram Protocol (UDP)

Status of This Memo

This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (2005).

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 User Datagram Protocol (UDP) in an IP version independent
manner. This memo obsoletes RFCs 2013 and 2454.

Table of Contents

1. The Internet-Standard Management Framework . . . . . . . . . . 2
2. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.1. Relationship to Other MIBs . . . . . . . . . . . . . . . 3
2.1.1. Relationship to RFC1213-MIB . . . . . . . . . . 3
2.1.2. Relationship to the IPV6-UDP-MIB . . . . . . . . 3
2.1.3. Relationship to HOST-RESOURCES-MIB and
SYSAPPL-MIB. . . . . . . . . . . . . . . . . . . 4
3. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 15
5. Contributors . . . . . . . . . . . . . . . . . . . . . . . . . 15
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8.1. Normative References . . . . . . . . . . . . . . . . . . 17
8.2. Informative References . . . . . . . . . . . . . . . . . 18

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1. The Internet-Standard Management Framework

For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC3410].

Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
[RFC2580].

2. Overview

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 User Datagram Protocol (UDP), as defined in RFC 768 [RFC0768],
in an IP version independent manner.

The current UDP-MIB defined in this memo consists of one table and a
group of scalars:

o The udp group of scalars reports parameters and statistics of a
UDP protocol engine. Two scalars, udpHCInDatagrams and
udpHCOutDatagrams, have been added to this group since the
publication of RFC 2013 [RFC2013] in order to provide high-
capacity counters for fast networks. Discontinuities in the
values of the counters in this group are indicated by
discontinuities in the value of the sysUpTime object, which is
defined in RFC 3418 [RFC3418].

o The udpEndpointTable provides access to status information for all
UDP endpoints handled by a UDP protocol engine. The table
provides for strictly listening endpoints, as with the historical
udpTable, and also for "connected" UDP endpoints, which only
accept packets from a given remote system. It also reports
identification of the operating system level processes that handle
UDP connections. Addresses and ports of UDP endpoints in this
table are represented using the InetAddressType, InetAddress, and
InetPortNumber textual conventions defined in RFC 4001 [RFC4001].

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2.1. Relationship to Other MIBs

This section discusses the relationship of this UDP-MIB module to
other MIB modules.

2.1.1. Relationship to RFC1213-MIB

UDP related MIB objects were originally defined as part of the
RFC1213-MIB, defined in RFC 1213 [RFC1213]. The UDP related objects
of the RFC1213-MIB were later copied into a separate MIB module and
published in RFC 2013 [RFC2013] in SMIv2 format.

The previous versions of the UDP-MIB both defined the udpTable, which
has been deprecated for basically two reasons:

(1) The udpTable only supports IPv4.

The current approach in the IETF is to write IP version neutral
MIBs rather than have different definitions for various version
of IP. This reduces the amount of overhead when new objects are
introduced, since there is only one place to add them. Hence,
the approach taken in RFC 2454 [RFC2454] of having separate
tables is not continued.

(2) The udpTable does not permit describing "connected" UDP
endpoints.

It turns out that "connected" endpoints tend to have a different
behaviour and management access pattern from those of listening
endpoints. Adding remote endpoint information to the
udpEndpointTable thus allows for the addition of specific status
and statistic objects for "connected" endpoints and connections.

2.1.2. Relationship to the IPV6-UDP-MIB

The IPV6-UDP-MIB, defined in RFC 2454 [RFC2454], has been moved to
Historic because the approach of having separate IP version specific
tables is not followed anymore. Implementation of RFC 2454 is thus
not suggested anymore.

Note that because scoped addresses are now represented using the
IPv4z and IPv6z address types, there is no longer a need to
explicitly include the ifIndex in the index clause of the
udpEndpointTable. This is a change from the use of ipv6UdpIfIndex in
RFC 2454.

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2.1.3. Relationship to HOST-RESOURCES-MIB and SYSAPPL-MIB

The udpEndpointTable reports the identification of the operating
system level process that handles a connection or a listening
endpoint. The value is reported as an Unsigned32, which is expected
to be the same as the hrSWRunIndex of the HOST-RESOURCES-MIB
[RFC2790] (if the value is smaller than 2147483647) or the
sysApplElmtRunIndex of the SYSAPPL-MIB [RFC2287]. This allows
management applications to identify the UDP connections that belong
to an operating system level process, which has proven valuable in
operational environments.

3. Definitions

UDP-MIB DEFINITIONS ::= BEGIN

IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Counter32, Counter64,
Unsigned32, IpAddress, mib-2 FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF
InetAddress, InetAddressType,
InetPortNumber FROM INET-ADDRESS-MIB;

udpMIB MODULE-IDENTITY
LAST-UPDATED "200505200000Z" -- May 20, 2005
ORGANIZATION
"IETF IPv6 Working Group
http://www.ietf.org/html.charters/ipv6-charter.html"
CONTACT-INFO
"Bill Fenner (editor)

AT&T Labs -- Research
75 Willow Rd.
Menlo Park, CA 94025

Phone: +1 650 330-7893
Email: <[email protected]>

John Flick (editor)

Hewlett-Packard Company
8000 Foothills Blvd. M/S 5557
Roseville, CA 95747

Phone: +1 916 785 4018
Email: <[email protected]>

Send comments to <[email protected]>"

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DESCRIPTION
"The MIB module for managing UDP implementations.
Copyright (C) The Internet Society (2005). This
version of this MIB module is part of RFC 4113;
see the RFC itself for full legal notices."
REVISION "200505200000Z" -- May 20, 2005
DESCRIPTION
"IP version neutral revision, incorporating the
following revisions:

- Added udpHCInDatagrams and udpHCOutDatagrams in order
to provide high-capacity counters for fast networks.
- Added text to the descriptions of all counter objects
to indicate how discontinuities are detected.
- Deprecated the IPv4-specific udpTable and replaced it
with the version neutral udpEndpointTable. This
table includes support for connected UDP endpoints
and support for identification of the operating
system process associated with a UDP endpoint.
- Deprecated the udpGroup and replaced it with object
groups representing the current set of objects.
- Deprecated udpMIBCompliance and replaced it with
udpMIBCompliance2, which includes the compliance
information for the new object groups.

This version published as RFC 4113."
REVISION "199411010000Z" -- November 1, 1994
DESCRIPTION
"Initial SMIv2 version, published as RFC 2013."
REVISION "199103310000Z" -- March 31, 1991
DESCRIPTION
"The initial revision of this MIB module was part of
MIB-II, published as RFC 1213."
::= { mib-2 50 }

-- the UDP group

udp OBJECT IDENTIFIER ::= { mib-2 7 }

udpInDatagrams OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of UDP datagrams delivered to UDP
users.

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Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 1 }

udpNoPorts OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of received UDP datagrams for which
there was no application at the destination port.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 2 }

udpInErrors OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of received UDP datagrams that could not be
delivered for reasons other than the lack of an
application at the destination port.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 3 }

udpOutDatagrams OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of UDP datagrams sent from this
entity.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 4 }

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udpHCInDatagrams OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of UDP datagrams delivered to UDP
users, for devices that can receive more than 1
million UDP datagrams per second.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 8 }

udpHCOutDatagrams OBJECT-TYPE
SYNTAX Counter64
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The total number of UDP datagrams sent from this
entity, for devices that can transmit more than 1
million UDP datagrams per second.

Discontinuities in the value of this counter can occur
at re-initialization of the management system, and at
other times as indicated by discontinuities in the
value of sysUpTime."
::= { udp 9 }

--
-- { udp 6 } was defined as the ipv6UdpTable in RFC2454's
-- IPV6-UDP-MIB. This RFC obsoletes RFC 2454, so { udp 6 } is
-- obsoleted.
--

-- The UDP "Endpoint" table.

udpEndpointTable OBJECT-TYPE
SYNTAX SEQUENCE OF UdpEndpointEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A table containing information about this entity's UDP
endpoints on which a local application is currently
accepting or sending datagrams.

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The address type in this table represents the address
type used for the communication, irrespective of the
higher-layer abstraction. For example, an application
using IPv6 'sockets' to communicate via IPv4 between
::ffff:10.0.0.1 and ::ffff:10.0.0.2 would use
InetAddressType ipv4(1).

Unlike the udpTable in RFC 2013, this table also allows
the representation of an application that completely
specifies both local and remote addresses and ports. A
listening application is represented in three possible
ways:

1) An application that is willing to accept both IPv4
and IPv6 datagrams is represented by a
udpEndpointLocalAddressType of unknown(0) and a
udpEndpointLocalAddress of ''h (a zero-length
octet-string).

2) An application that is willing to accept only IPv4
or only IPv6 datagrams is represented by a
udpEndpointLocalAddressType of the appropriate
address type and a udpEndpointLocalAddress of
'0.0.0.0' or '::' respectively.

3) An application that is listening for datagrams only
for a specific IP address but from any remote
system is represented by a
udpEndpointLocalAddressType of the appropriate
address type, with udpEndpointLocalAddress
specifying the local address.

In all cases where the remote is a wildcard, the
udpEndpointRemoteAddressType is unknown(0), the
udpEndpointRemoteAddress is ''h (a zero-length
octet-string), and the udpEndpointRemotePort is 0.

If the operating system is demultiplexing UDP packets
by remote address and port, or if the application has
'connected' the socket specifying a default remote
address and port, the udpEndpointRemote* values should
be used to reflect this."
::= { udp 7 }

udpEndpointEntry OBJECT-TYPE
SYNTAX UdpEndpointEntry
MAX-ACCESS not-accessible
STATUS current

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DESCRIPTION
"Information about a particular current UDP endpoint.

Implementers need to be aware that if the total number
of elements (octets or sub-identifiers) in
udpEndpointLocalAddress and udpEndpointRemoteAddress
exceeds 111, then OIDs of column instances in this table
will have more than 128 sub-identifiers and cannot be
accessed using SNMPv1, SNMPv2c, or SNMPv3."
INDEX { udpEndpointLocalAddressType,
udpEndpointLocalAddress,
udpEndpointLocalPort,
udpEndpointRemoteAddressType,
udpEndpointRemoteAddress,
udpEndpointRemotePort,
udpEndpointInstance }
::= { udpEndpointTable 1 }

UdpEndpointEntry ::= SEQUENCE {
udpEndpointLocalAddressType InetAddressType,
udpEndpointLocalAddress InetAddress,
udpEndpointLocalPort InetPortNumber,
udpEndpointRemoteAddressType InetAddressType,
udpEndpointRemoteAddress InetAddress,
udpEndpointRemotePort InetPortNumber,
udpEndpointInstance Unsigned32,
udpEndpointProcess Unsigned32
}

udpEndpointLocalAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The address type of udpEndpointLocalAddress. Only
IPv4, IPv4z, IPv6, and IPv6z addresses are expected, or
unknown(0) if datagrams for all local IP addresses are
accepted."
::= { udpEndpointEntry 1 }

udpEndpointLocalAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local IP address for this UDP endpoint.

The value of this object can be represented in three

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possible ways, depending on the characteristics of the
listening application:

1. For an application that is willing to accept both
IPv4 and IPv6 datagrams, the value of this object
must be ''h (a zero-length octet-string), with
the value of the corresponding instance of the
udpEndpointLocalAddressType object being unknown(0).

2. For an application that is willing to accept only IPv4
or only IPv6 datagrams, the value of this object
must be '0.0.0.0' or '::', respectively, while the
corresponding instance of the
udpEndpointLocalAddressType object represents the
appropriate address type.

3. For an application that is listening for data
destined only to a specific IP address, the value
of this object is the specific IP address for which
this node is receiving packets, with the
corresponding instance of the
udpEndpointLocalAddressType object representing the
appropriate address type.

As this object is used in the index for the
udpEndpointTable, implementors of this table should be
careful not to create entries that would result in OIDs
with more than 128 subidentifiers; else the information
cannot be accessed using SNMPv1, SNMPv2c, or SNMPv3."
::= { udpEndpointEntry 2 }

udpEndpointLocalPort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The local port number for this UDP endpoint."
::= { udpEndpointEntry 3 }

udpEndpointRemoteAddressType OBJECT-TYPE
SYNTAX InetAddressType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The address type of udpEndpointRemoteAddress. Only
IPv4, IPv4z, IPv6, and IPv6z addresses are expected, or
unknown(0) if datagrams for all remote IP addresses are
accepted. Also, note that some combinations of

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udpEndpointLocalAdressType and
udpEndpointRemoteAddressType are not supported. In
particular, if the value of this object is not
unknown(0), it is expected to always refer to the
same IP version as udpEndpointLocalAddressType."
::= { udpEndpointEntry 4 }

udpEndpointRemoteAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote IP address for this UDP endpoint. If
datagrams from any remote system are to be accepted,
this value is ''h (a zero-length octet-string).
Otherwise, it has the type described by
udpEndpointRemoteAddressType and is the address of the
remote system from which datagrams are to be accepted
(or to which all datagrams will be sent).

As this object is used in the index for the
udpEndpointTable, implementors of this table should be
careful not to create entries that would result in OIDs
with more than 128 subidentifiers; else the information
cannot be accessed using SNMPv1, SNMPv2c, or SNMPv3."
::= { udpEndpointEntry 5 }

udpEndpointRemotePort OBJECT-TYPE
SYNTAX InetPortNumber
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The remote port number for this UDP endpoint. If
datagrams from any remote system are to be accepted,
this value is zero."
::= { udpEndpointEntry 6 }

udpEndpointInstance OBJECT-TYPE
SYNTAX Unsigned32 (1..'ffffffff'h)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The instance of this tuple. This object is used to
distinguish among multiple processes 'connected' to
the same UDP endpoint. For example, on a system
implementing the BSD sockets interface, this would be
used to support the SO_REUSEADDR and SO_REUSEPORT
socket options."

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::= { udpEndpointEntry 7 }

udpEndpointProcess OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The system's process ID for the process associated with
this endpoint, 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."
::= { udpEndpointEntry 8 }

-- The deprecated UDP Listener table

-- The deprecated UDP listener table only contains information
-- about this entity's IPv4 UDP end-points on which a local
-- application is currently accepting datagrams. It does not
-- provide more detailed connection information, or information
-- about IPv6 endpoints.

udpTable OBJECT-TYPE
SYNTAX SEQUENCE OF UdpEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"A table containing IPv4-specific UDP listener
information. It contains information about all local
IPv4 UDP end-points on which an application is
currently accepting datagrams. This table has been
deprecated in favor of the version neutral
udpEndpointTable."
::= { udp 5 }

udpEntry OBJECT-TYPE
SYNTAX UdpEntry
MAX-ACCESS not-accessible
STATUS deprecated
DESCRIPTION
"Information about a particular current UDP listener."
INDEX { udpLocalAddress, udpLocalPort }
::= { udpTable 1 }

UdpEntry ::= SEQUENCE {
udpLocalAddress IpAddress,
udpLocalPort Integer32

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}

udpLocalAddress OBJECT-TYPE
SYNTAX IpAddress
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The local IP address for this UDP listener. In the
case of a UDP listener that is willing to accept
datagrams for any IP interface associated with the
node, the value 0.0.0.0 is used."
::= { udpEntry 1 }

udpLocalPort OBJECT-TYPE
SYNTAX Integer32 (0..65535)
MAX-ACCESS read-only
STATUS deprecated
DESCRIPTION
"The local port number for this UDP listener."
::= { udpEntry 2 }

-- conformance information

udpMIBConformance OBJECT IDENTIFIER ::= { udpMIB 2 }
udpMIBCompliances OBJECT IDENTIFIER ::= { udpMIBConformance 1 }
udpMIBGroups OBJECT IDENTIFIER ::= { udpMIBConformance 2 }

-- compliance statements

udpMIBCompliance2 MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for systems that implement
UDP.

There are a number of INDEX objects that cannot be
represented in the form of OBJECT clauses in SMIv2, but
for which we have the following compliance
requirements, expressed in OBJECT clause form in this
description clause:

-- OBJECT udpEndpointLocalAddressType
-- SYNTAX InetAddressType { unknown(0), ipv4(1),
-- ipv6(2), ipv4z(3),
-- ipv6z(4) }
-- DESCRIPTION
-- Support for dns(5) is not required.
-- OBJECT udpEndpointLocalAddress

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-- SYNTAX InetAddress (SIZE(0|4|8|16|20))
-- DESCRIPTION
-- Support is only required for zero-length
-- octet-strings, and for scoped and unscoped
-- IPv4 and IPv6 addresses.
-- OBJECT udpEndpointRemoteAddressType
-- SYNTAX InetAddressType { unknown(0), ipv4(1),
-- ipv6(2), ipv4z(3),
-- ipv6z(4) }
-- DESCRIPTION
-- Support for dns(5) is not required.
-- OBJECT udpEndpointRemoteAddress
-- SYNTAX InetAddress (SIZE(0|4|8|16|20))
-- DESCRIPTION
-- Support is only required for zero-length
-- octet-strings, and for scoped and unscoped
-- IPv4 and IPv6 addresses.
"
MODULE -- this module
MANDATORY-GROUPS { udpBaseGroup, udpEndpointGroup }
GROUP udpHCGroup
DESCRIPTION
"This group is mandatory for systems that
are capable of receiving or transmitting more than
1 million UDP datagrams per second. 1 million
datagrams per second will cause a Counter32 to
wrap in just over an hour."
::= { udpMIBCompliances 2 }

udpMIBCompliance MODULE-COMPLIANCE
STATUS deprecated
DESCRIPTION
"The compliance statement for IPv4-only systems that
implement UDP. For IP version independence, this
compliance statement is deprecated in favor of
udpMIBCompliance2. However, agents are still
encouraged to implement these objects in order to
interoperate with the deployed base of managers."
MODULE -- this module
MANDATORY-GROUPS { udpGroup }
::= { udpMIBCompliances 1 }

-- units of conformance

udpGroup OBJECT-GROUP
OBJECTS { udpInDatagrams, udpNoPorts,
udpInErrors, udpOutDatagrams,
udpLocalAddress, udpLocalPort }

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STATUS deprecated
DESCRIPTION
"The deprecated group of objects providing for
management of UDP over IPv4."
::= { udpMIBGroups 1 }

udpBaseGroup OBJECT-GROUP
OBJECTS { udpInDatagrams, udpNoPorts, udpInErrors,
udpOutDatagrams }
STATUS current
DESCRIPTION
"The group of objects providing for counters of UDP
statistics."
::= { udpMIBGroups 2 }

udpHCGroup OBJECT-GROUP
OBJECTS { udpHCInDatagrams, udpHCOutDatagrams }
STATUS current
DESCRIPTION
"The group of objects providing for counters of high
speed UDP implementations."
::= { udpMIBGroups 3 }

udpEndpointGroup OBJECT-GROUP
OBJECTS { udpEndpointProcess }
STATUS current
DESCRIPTION
"The group of objects providing for the IP version
independent management of UDP 'endpoints'."
::= { udpMIBGroups 4 }

END

4. Acknowledgements

This document contains a modified subset of RFC 1213 and replaces
RFCs 2013 and 2454. Acknowledgments are therefore due to the authors
and editors of these documents for their excellent work.

5. Contributors

This document is an output of the IPv6 MIB revision team, and
contributors to earlier versions of this document include:

Bill Fenner, AT&T Labs -- Research
Email: [email protected]

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RFC 4113 UDP MIB June 2005

Brian Haberman
Email: [email protected]

Shawn A. Routhier, Wind River
Email: [email protected]

Juergen Schoenwalder, TU Braunschweig
Email: [email protected]

Dave Thaler, Microsoft
Email: [email protected]

Much of Keith McCloghrie's text from RFC1213/RFC2013 remains in this
document, and the structure of the MIB is due to him.

Mike Daniele wrote the original IPv6 UDP MIB in RFC2454.

Juergen Schoenwalder provided much of the text for section 2.

6. Security Considerations

There are no management objects defined in this MIB that have a MAX-
ACCESS clause of read-write and/or read-create. So, if this MIB is
implemented correctly, then there is no risk that an intruder can
alter or create any management objects of this MIB module via direct
SNMP SET operations.

Some of the readable objects in this MIB module (i.e., objects with a
MAX-ACCESS other than not-accessible) may be considered sensitive or
vulnerable in some network environments. It is thus important to
control even GET and/or NOTIFY access to these objects and possibly
to even encrypt the values of these objects when sending them over
the network via SNMP. These are the tables and objects and their
sensitivity/vulnerability:

The indices of the udpEndpointTable and udpTable contain information
on the listeners on an entity. In particular, the
udpEndpointLocalPort and udpLocalPort objects in the indices can be
used to identify what ports are open on the machine and what attacks
are likely to succeed, without the attacker having to run a port
scanner.

SNMP versions prior to SNMPv3 did not include adequate security.
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 module.

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It is recommended that the implementors consider the security
features as provided by the SNMPv3 framework (see [RFC3410], section
8), including full support for the SNMPv3 cryptographic mechanisms
(for authentication and privacy).

Furthermore, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.

7. IANA Considerations

The MIB module in this document uses the following IANA-assigned
OBJECT IDENTIFIER values, recorded in the SMI Numbers registry:

+------------+-------------------------+
| Descriptor | OBJECT IDENTIFIER value |
+------------+-------------------------+
| udp | { mib-2 7} |
| udpMIB | { mib-2 50 } |
+------------+-------------------------+

8. References

8.1. Normative References

[RFC0768] Postel, J., "User Datagram Protocol", STD 6, RFC 768,
August 1980.

[RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Structure of Management Information Version 2 (SMIv2)",
STD 58, RFC 2578, April 1999.

[RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Textual Conventions for SMIv2", STD 58, RFC 2579, April
1999.

[RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580,
April 1999.

[RFC3418] Presuhn, R., "Management Information Base (MIB) for the
Simple Network Management Protocol (SNMP)", STD 62, RFC
3418, December 2002.

Fenner & Flick Standards [Page 17]

RFC 4113 UDP MIB June 2005

[RFC4001] Daniele, M., Haberman, B., Routhier, S., and J.
Schoenwaelder, "Textual Conventions for Internet Network
Addresses", RFC 4001, February 2005.

8.2. Informative References

[RFC1213] McCloghrie, K. and M. Rose, "Management Information Base
for Network Management of TCP/IP-based internets:MIB-II",
STD 17, RFC 1213, March 1991.

[RFC2013] McCloghrie, K., "SNMPv2 Management Information Base for
the User Datagram Protocol using SMIv2", RFC 2013,
November 1996.

[RFC2287] Krupczak, C. and J. Saperia, "Definitions of System-Level
Managed Objects for Applications", RFC 2287, February
1998.

[RFC2454] Daniele, M., "IP Version 6 Management Information Base for
the User Datagram Protocol", RFC 2454, December 1998.

[RFC2790] Waldbusser, S. and P. Grillo, "Host Resources MIB", RFC
2790, March 2000.

[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.

Authors' Addresses

Bill Fenner
AT&T Labs -- Research
75 Willow Rd
Menlo Park, CA 94025
USA

EMail: [email protected]

John Flick
Hewlett-Packard Company
8000 Foothills Blvd. M/S 5557
Roseville, CA 95747-5557
USA

EMail: [email protected]

Fenner & Flick Standards [Page 18]

RFC 4113 UDP MIB June 2005

Full Copyright Statement

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Fenner & Flick Standards [Page 19]