agentx comms problem

Hi,

I am trying to get a working agentx module by following the tutorial at
http://net-snmp.sourceforge.net/wiki/index.php/TUT:Writing_a_Subagent

Problem: when I do this:

  snmpget -v1 -c public localhost nstAgentSubagentObject.0

I get:

  Error in packet
  Reason: (noSuchName) There is no such variable name in this MIB.
  Failed object: NET-SNMP-TUTORIAL-MIB::nstAgentSubagentObject.0

For debugging, I am starting snmpd so:

  snmpd -Le -f -Dagentx

When I run up the subagent 'mysubagent', the output from snmpd looks so:

8<----------8<----------8<----------8<----------8<----------8<----------
agentx/master: unexpected callback op 4
agentx/master: handle pdu (req=0x1a8d7bd2,trans=0x0,sess=0x0)
agentx/master: open 0x814ced8
agentx/master: opened 0x815da00 = 5 with flags = a0
agentx/master: send response, stat 0 (req=0x1a8d7bd2,trans=0x0,sess=0x0)
agentx_build: packet built okay
agentx/master: handle pdu (req=0x1a8d7bd3,trans=0x0,sess=0x5)
agentx/master: in register_agentx_list
agentx/master: registered ok
agentx/master: send response, stat 0 (req=0x1a8d7bd3,trans=0x0,sess=0x5)
agentx_build: packet built okay
8<----------8<----------8<----------8<----------8<----------8<----------

It looks to me like mysubagent is registering okay, but what's that error
'unexpected callback op 4' ? Is that perhaps the problem?

When I run the command snmpget -v1 -c public localhost nstAgentSubagentObject.0
the snmpd daemon only prints one line:

    Connection from UDP: [127.0.0.1]:58692

In fact if I kill mysubagent, the error I get from the 'snmpget' is no
different, which makes me think that snmpd and mysubagent are not talking
happily, but /var/agentx/master exists, and when mysubagent is running
snmpd appears to get a 'ping' packet every 15 seconds or so.

Here are my config files:

~/.snmp/snmp.conf contains:

    mibs +NET-SNMP-EXAMPLES-MIB
    mibs +NET-SNMP-MIB
    mibs +NET-SNMP-TUTORIAL-MIB

~/.snmp/mibs/ contains these files:

    NET-SNMP-EXAMPLES-MIB
    NET-SNMP-MIB
    NET-SNMP-TUTORIAL-MIB

/etc/snmp/snmpd.conf looks like so:

    com2sec paranoid  default         public
    com2sec readwrite 10.0.0.0/8      private
    group MyROSystem v1        paranoid
    group MyROSystem v2c       paranoid
    group MyROSystem usm       paranoid
    group MyROGroup v1         readonly
    group MyROGroup v2c        readonly
    group MyROGroup usm        readonly
    group MyRWGroup v1         readwrite
    group MyRWGroup v2c        readwrite
    group MyRWGroup usm        readwrite
    view all    included  .1                               80
    view system included  .iso.org.dod.internet.mgmt.mib-2.system
    access MyROSystem ""     any       noauth    exact  system none   none
    access MyROGroup ""      any       noauth    exact  all    none   none
    access MyRWGroup ""      any       noauth    exact  all    all    none
    syslocation Unknown (configure /etc/snmp/snmpd.local.conf)
    syscontact Root <root@localhost> (configure /etc/snmp/snmpd.local.conf)
    master  agentx

Many thanks,
Thomas

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