Hi,
I've just started working with SNMP4J (and SNMP in general), and have
been very impressed with how quickly the library has helped me to get
something up and running. However, I could use a little help.
I've built a very simple agent based upon TestAgent, and I've tried it
with two separate clients: net-snmp's snmpget and the graphical browser
Mibble. When I use net-snmp, I successfully retrieve the value I'm
looking for. Mibble, however, times out.
With the help of a packet sniffer, and plenty of debug information, I've
uncovered the following...
net-snmp snmpget:
* net-snmp issues a non-specific 'get', specifying no engine ID,
boot count or time
* agent responds with 1.3.6.1.6.3.15.1.1.4.0 ('unknown engine ID')
- the report includes the correct engine ID, plus boot count and time
both set to zero
* net-snmp issues a 'get' for the desired OID, with the correct
engine ID, plus boot count and time both set to zero
* agent responds with 1.3.6.1.6.3.15.1.1.2.0 ('not in time
window') - the report includes the correct engine ID, plus correct boot
count and time
* net-snmp issues a 'get' for the desired OID, with the correct
engine ID, plus correct boot count and time
* agent responds with the requested information
Mibble:
* Mibble issues a 'get' for the desired OID, with the incorrect
engine ID and some non-zero values for boot count and time
* agent throws some exceptions (Mibble retries a number of times,
each time causing an exception)
* the Mibble request times out
The exception (manually transcribed, so forgive any typos!) is:
java.lang.NullPointerException
at org.snmp4j.mp.MPv3.prepareDataElements(MPv3.java:1103)
at
org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.j
ava:263)
...
I'm using SNMP v3 with an 'authNoPriv' user. I'm building against
snmp4j-1.9.3d and snmp4j-agent-1.2.2.
I've also tried querying a net-snmp agent using both client tools. With
net-snmp as the agent, both client tools get the value they're looking
for.
Can anybody help to explain what is going on? Might I have
misconfigured by agent in some way?
Any help would be appreciated!
Thanks,
Alistair.
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