D-Link DFL-260E User Manual for DFL-260E - Page 73
SNMP Monitoring, Simple Network Management Protocol, GET REQUEST, GET NEXT REQUEST
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2.4.2. SNMP Monitoring Chapter 2. Management and Maintenance Maximum Loss Grace Period Send from Shared IP Address 2.4.2. SNMP Monitoring A single host is considered unreachable if this number of consecutive ping responses to that host are not replied to. Do not allow the link monitor to trigger an action for this number of seconds after the last reconfiguration. This avoids false positives during initial link negotiation. The default value is 45 seconds. This option only appears in an HA cluster and should be used if individual public IPv4 addresses are not available to the devices in a cluster. Overview Simple Network Management Protocol (SNMP) is a standardized protocol for management of network devices. An SNMP compliant client can connect to a network device which supports the SNMP protocol to query and control it. NetDefendOS supports SNMP version 1 and version 2. Connection can be made by any SNMP compliant clients to devices running NetDefendOS. However, only query operations are permitted for security reasons. Specifically, NetDefendOS supports the following SNMP request operations by a client: • The GET REQUEST operation • The GET NEXT REQUEST operation • The GET BULK REQUEST operation (SNMP Version 2c only) The NetDefendOS MIB The Management Information Base (MIB) is a database, usually in the form of a text file, which defines the parameters on a network device that an SNMP client can query or change. The MIB file for a device running NetDefendOS is distributed with the standard NetDefendOS distribution pack as a file with the name DFLNNN-TRAP.MIB (where NNN indicates the model number of the firewall). This MIB file should be transferred to the hard disk of the workstation that will run the SNMP client so it can be imported by the client software. When the SNMP client runs, the MIB file is read and tells the client which values can be queried on a NetDefendOS device. Defining SNMP Access SNMP access is defined through the definition of a NetDefendOS Remote object with a Mode value of SNMP. The Remote object requires the entry of: • Interface - The NetDefendOS interface on which SNMP requests will arrive. • Network - The IP address or network from which SNMP requests will come. • Community - The community string which provides password security for the accesses. The Community String 73