Oracle Hardware Management Pack contains an SNMP Plugin module that extends the native SNMP agent in the host operating system to provide additional Oracle MIB capabilities. It is particularly important to note that the Oracle Hardware Management Pack does not itself contain an SNMP agent. For Linux, a module is added to the net-snmp agent, which must be previously installed. For Solaris, a module is added to the Solaris Management Agent. For Windows, the plugin extends the native SNMP service.
Likewise, any security settings related to SNMP for the Oracle Hardware Management Pack SNMP Plugin are determined by the settings of the native SNMP agent or service, and not by the plugin. See the documentation for net-snmp or the Windows SNMP service for instructions on how to configure SNMP securely.