D-Link DFL-2500 User Guide - Page 313
D-Link DES 3250TG minimum firmware: R3.00-B09
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294 Chapter 28. Zone Defense • The IP address of the management interface of the switch • The switch model type • The SNMP community string (write access) Currently, Zone Defense feature supports the following switches: - D-Link DES 3226S (minimum firmware: R4.02-B14) - D-Link DES 3250TG (minimum firmware: R3.00-B09) - D-Link DES 3326S (minimum firmware: R4.01-B39) - D-Link DES 3350SR (minimum firmware: R1.02.035 ) - D-Link DES 3526 (minimum firmware: R3.01-B23) - D-Link DES 3550 (minimum firmware: R3.01-B23) - D-Link DGS 3324SR (minimum firmware: R4.10-B15) Note Make sure that the switches have the minimum required firmware versions before activating Zone Defense. 28.2.1 SNMP Simple Network Management Protocol (SNMP) is an application layer protocol for complex network management. SNMP allows managers and managed devices in a network to communicate by sending messages, for the purpose of accessing different parts of the network. Manager A typical manager, such as a D-Link firewall, executes SNMP protocol to monitor and control network devices in the managed environment. The manager can query stored statistics from the controlled devices by using the SNMP community string , which is like a user id or password to allow access to the device's database. If the community string type is "write", the manager will be allowed to modify properties in the device. D-Link Firewalls User's Guide