Hi, I'm running a subagent based on python-netsnmpagent, along with the distribution snmpd (net-snmp) agent on a Debian embedded system. I'm using the version of snmpd that comes default with the distribution - 5.7.3. I have a custom MIB for my new variables, similar to SIMPLE-MIB.txt in the python-netsnmpagent example. Through the standard snmp command line commands I am able to read and write to the standard MIB defined OIDs, and to the new OIDs in my MIB, without issue.
I would like to also be able to take over management of sysContact and sysLocation through my subagent. This makes it easier to control these variables through my outside gui. I've tried registering SNMPv2-MIB::sysContact and SNMPv2-MIB::sysLocation through the agentx socket, but receive error 263 - duplicate registration. It seems the primary agent has already registered these variables and won't give up control. How does the agent know which variables the subagent can register and which it cannot? Is my error due to another cause? My custom MIB is located in the same directory as the rest of the system MIBs, in the search path - /usr/share/snmp/mibs. When I register a variable from my MIB, the master agent accepts it. When I attempt to register sysContact or sysLocation it is denied. If all the MIBs are stored together, how does it know my SIMPLE-MIB objects can be registered, but the others cannot? Is there configuration somewhere else that determines which MIB variables I can register and which I cannot? Am I only able to register variables in the new MIB? How does it know which MIBs are custom and which are standard? I've checked the snmpd.conf file, and it looks like I can define OID trees that trigger external programs, but there doesn't appear to be configuration for which OIDs are under master control and which can be controlled by the subagent, for normal snmp command line access. Is there perhaps a better way of going about doing this? I've gone through the mail lists and haven't been able to find an answer to this question. Any help/pointers on this would be much appreciated. Thank you, Winston
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