Netgear XCM8806 Chassis User Manual - Page 82
Message Processing, SNMPv3 Security, USM Timeliness Mechanisms
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NETGEAR 8800 User Manual • Disclosure, where packet exchanges are sniffed (examined) and information is learned about the contents The access control subsystem provides the ability to configure whether access to a managed object in a local MIB is allowed for a remote principal. The access control scheme allows you to define access policies based on MIB views, groups, and multiple security levels. In addition, the SNMPv3 target and notification MIBs provide a more procedural approach for generating and filtering of notifications. SNMPv3 objects are stored in non-volatile memory unless specifically assigned to volatile storage. Objects defined as permanent cannot be deleted. Note: In SNMPv3, many objects can be identified by a human-readable string or by a string of hexadecimal octets. In many commands, you can use either a character string, or a colon-separated string of hexadecimal octets to specify objects. To indicate hexadecimal octets, use the keyword hex in the command. Message Processing A particular network manager may require messages that conform to a particular version of SNMP. The choice of the SNMPv1, SNMPv2c, or SNMPv3 MP model can be configured for each network manager as its target address is configured. The selection of the MP model is configured with the mp-model keyword in the following command: configure snmpv3 add target-params [[hex ] | ] user [[hex ] | ] mp-model [snmpv1 | snmpv2c | snmpv3] sec-model [snmpv1 | snmpv2c | usm] {sec-level [noauth | authnopriv | priv]} {volatile} SNMPv3 Security In SNMPv3 the User-Based Security Model (USM) for SNMP was introduced. USM deals with security related aspects like authentication, encryption of SNMP messages, and defining users and their various access security levels. This standard also encompasses protection against message delay and message replay. USM Timeliness Mechanisms A NETGEAR switch has one SNMPv3 engine, identified by its snmpEngineID. The first four octets are fixed to 80:00:11:AE, which represents the NETGEAR vendor ID. By default, the additional octets for the snmpEngineID are generated from the device MAC address. Every SNMPv3 engine necessarily maintains two objects: SNMPEngineBoots, which is the number of reboots the agent has experienced and SNMPEngineTime, which is the local time since the engine reboot. The engine has a local copy of these objects and the 82 | Chapter 3. Managing the Switch
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