To run some agents successfully, a certain pair of snmp and utils package must 
be pre-installed. Some snmp and utils packages which are often used on standard 
platforms such as redhat 73 and redhat 80 have been paired off in the table:
===================================================================================
Platform           | snmp package               | snmp utility package
-----------------------------------------------------------------------------------
redhat73           | ucd-snmp-4.2.3-1.i386.rpm  | ucd-snmp-utils-4.2.3-1.i386.rpm
-----------------------------------------------------------------------------------
redhat80           | ucd-snmp-4.2.3-1.i386.rpm  | ucd-snmp-utils-4.2.3-1.i386.rpm
-----------------------------------------------------------------------------------
redhat90           | net-snmp-5.0.6-17.i386.rpm | net-snmp-utils-5.0.6-17.i386.rpm
-----------------------------------------------------------------------------------
redhat enterprise3 | net-snmp-5.0.8-11.i386.rpm | net-snmp-utils-5.0.8-11.i386.rpm
===================================================================================

Each line of the table represents a pair.
For instance:
  If your operating system is redhat 90, then you must install 
net-snmp-5.0.6-17.i386.rpm and net-snmp-utils-5.0.6-17.i386.rpm!