Snmp Traps - D-Link DFL-260E User Manual

2.2.6. SNMP Traps

2.2.6. SNMP Traps
The SNMP protocol
Simple Network Management Protocol (SNMP) is a means for communicating between a Network
Management System (NMS) and a managed device. SNMP defines 3 types of messages: a Read
command for an NMS to examine a managed device, a Write command to alter the state of a
managed device and a Trap which is used by managed devices to send messages asynchronously to
an NMS about a change of state.
SNMP Traps in NetDefendOS
NetDefendOS takes the concept of an SNMP Trap one step further by allowing any event message
to be sent as an SNMP trap. This means that the administrator can set up SNMP Trap notification of
events that are considered significant in the operation of a network.
The file DFLNNN-TRAP.MIB (where NNN indicates the model number of the firewall) is provided
by D-Link and defines the SNMP objects and data types that are used to describe an SNMP Trap
received from NetDefendOS.
For each NetDefend Firewall model there is one generic trap object called DLNNNosGenericTrap,
that is used for all traps (where NNN indicates the model number). This object includes the
following parameters:
• System - The system generating the trap
• Severity - Severity of the message
• Category - What NetDefendOS subsystem is reporting the problem
• ID - Unique identification within the category
• Description - A short textual description
• Action - What action is NetDefendOS taking
This information can be cross-referenced to the Log Reference Guide.
Example 2.12. Sending SNMP Traps to an SNMP Trap Receiver
To enable generation of SNMP traps for all events with a severity greater than or equal to Alert to an SNMP trap
receiver with an IP address of 195.11.22.55, follow the steps outlined below:
Command-Line Interface
gw-world:/> add LogReceiver EventReceiverSNMP2c my_snmp
Note
There is a different MIB file for each model of NetDefend Firewall. Make sure that the
correct file is used.
Note: SNMP Trap standards
NetDefendOS sends SNMP Traps which are based on the SNMPv2c standard as
defined by RFC1901, RFC1905 and RFC1906.
IPAddress=195.11.22.55
Chapter 2. Management and Maintenance
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