Netgear XCM8806 - 8800 SERIES 6-SLOT CHASSIS SWITCH 사용자 설명서

SNMPv3

SNMPv3 is an enhanced standard for SNMP that improves the security and privacy of SNMP 
access to managed devices and provides sophisticated control of access to the device MIB. 
The prior standard versions of SNMP, SNMPv1, and SNMPv2c, provided no privacy and little 
security. 

The following RFCs provide the foundation for the NETGEAR implementation of SNMPv3:

RFC 3410, Introduction to version 3 of the Internet-standard Network Management 

Framework, provides an overview of SNMPv3. 

RFC 3411, An Architecture for Describing SNMP Management Frameworks, talks about 

SNMP architecture, especially the architecture for security and administration. 

RFC 3412, Message Processing and Dispatching for the Simple Network Management 

Protocol (SNMP), talks about the message processing models and dispatching that can 
be a part of an SNMP engine. 

RFC 3413, SNMPv3 Applications, talks about the different types of applications that can 

be associated with an SNMPv3 engine. 

RFC 3414, The User-Based Security Model for Version 3 of the Simple Network 

Management Protocol (SNMPv3), describes the User-Based Security Model (USM).

RFC 3415, View-based Access Control Model (VACM) for the Simple Network 

Management Protocol (SNMP), talks about VACM as a way to access the MIB.

RFC 3826 - The Advanced Encryption Standard (AES) Cipher Algorithm in the SNMP 

User-based Security Model

3DES, AES 192 and AES 256 bit encryption are proprietary 

implementations and may not work with some SNMP Managers.

The SNMPv3 standards for network management were driven primarily by the need for 
greater security and access control. The new standards use a modular design and model 
management information by cleanly defining a message processing (MP) subsystem, a 
security subsystem, and an access control subsystem.

The MP subsystem helps identify the MP model to be used when processing a received 
Protocol Data Unit (PDU), which are the packets used by SNMP for communication. The MP 
layer helps in implementing a multilingual agent, so that various versions of SNMP can 
coexist simultaneously in the same network.

The security subsystem features the use of various authentication and privacy protocols with 
various timeliness checking and engine clock synchronization schemes. SNMPv3 is 
designed to be secure against:

Modification of information, where an in-transit message is altered

Masquerades, where an unauthorized entity assumes the identity of an authorized entity

Message stream modification, where packets are delayed and/or replayed