Here is a concise reference on SNMP, one of the TCP/IP Protocols
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SNMP was first developed in 1988 as part of the TCP/IP suite to exchange information about the configuration and status of nodes.
SNMP defines the arrangement of messages sent to configure, monitor, and control bridges, hubs, routers, network servers, and other equipment.
This Network Managment system is based on the Manager/Agent paradigm:
Management system clients "pull" data from agents by issueing GET status inquiries (e.g., to monitor printer queues) and SET requests to manage devices. The Console also send management information to:
Agent SNMP servers respond to GET commands with GET-RESPONSE message back to the SNMP Console.
Agent servers also "push" trap messages to clients, reporting extraordinary events.
Microsoft Windows 2000 uses the separate SNMP Trap Service (snmptrap.exe) to receive trap messages from agents.
Proxy agents cache and translate data between the network and devices that cannot implement SNMP. On Microsoft Windows the SNMP Agent is the SNMP Service (snmp.exe) automatically started by default.
On Microsoft machines, SNMP stores it configuration in Windows Registry HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/SNMP.
SNMP messages interact with virtual management information bases (MIBs) that define the properties of objects used to manage physical devices on the network, stored as objects formatted in Abstract Syntax Notation One (ASN.1).
The 1988 MIB-1 [ RFC 1212/1215] has 114 entries.
The 1990 MIB-II [ RFC 1158/1213 SNMPv1] MIB-2 has 171 entries to also include data on TCP/IP traffic, routing, configuration, and errors. HP has defined their own MIB structure.
Secure SNMP ConfigurationTo communicate with each other, SNMP consoles and devices must all be configured with the same SNMP Community Name.
To have the system automatically send an alert message if a nondefined host attempts to send a request to the server, check security option “Send authentication trap”.
To prevent a SNMP Agent from processing Set requests for a community of servers, set Read-Only community rights.
Events that trigger SNMP traps are configured on Windows 2000 using the “SNMP Event to Trap Translator”.
DPS Telecom's SNMP Tutorial
Poznan's Lessons about SNMP includes discussions about SNMPv2 and SNMPv3 [5 RFCs 2271 to 2275] in January 1998
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