Unknown engine ID

Greetings snmp users.

I have configured my snmpd.conf file to use snmpv3, and I ran tests
using 
snmp commands to verify that the snmpget and snmpwalk commands retrieve
the
requested data from the appropriate MIBs.  However, I am encountering a 
situation where the engine ID seems to be getting dropped or lost after
a 
short period of time (2 to 5 minutes).  Since it is not always the same 
time period, it would not appear to be a coded timeout value.   I did
not 
specify an engine ID in the snmpd.conf file because I read that that is
not 
the recommended procedure.  So snmp should be generating the engine ID
with 
its algorithm.

Please see the snmpget commands below.  The "timeticks" display the
number 
of seconds following the startup of the snmpd daemon.  Once the "Unknown

engine ID" msg is returned, the only way to get snmp to process commands

again is to restart the snmpd daemon.


---------------------------------------------------------------------

/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (4555) 0:00:45.55


/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (8348) 0:01:23.48

/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (19107) 0:03:11.07

/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (21359) 0:03:33.59

/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (22596) 0:03:45.96

/etc > snmpget hostname sysUpTime.0
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (24334) 0:04:03.34

/etc > snmpget hostname sysUpTime.0
snmpget: Unknown engine ID (Sub-id not found: (top) -> sysUpTime)

---------------------------------------------------------------------

Does anyone have ideas about what is causing the engine ID to get lost?

Thanking you in advance.

Eric Cardoza



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