[SNMP4J] EngineBoots and EngineTime issue

["M. Joaquín Suárez Chulián"]

Hi Frank,

I have an agent that is built for an embeded target. I know that the 
agent works properly for the version 3 of the protocol because I use an 
specific manager for this one.

I need to build a manager using snmp4j library. In fact, I have one that 
works fine without using authentication, but it fails when I use 
authentication like MD5 or SHA.

If I use Wireshark with the specific agent the result is something like 
that:

IP Manager 192.168.20.130
IP Agent 192.168.20.80

1    0.000000    192.168.20.130    192.168.20.80    SNMP    get-request
2    0.003054    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.4.0
3    0.009106    192.168.20.130    192.168.20.80    SNMP    get-request 
1.3.6.1.4.1.4761.99.11.1.1.0
4    0.013181    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.2.0
5    0.016548    192.168.20.130    192.168.20.80    SNMP    get-request 
1.3.6.1.4.1.4761.99.11.1.1.0
6    0.021766    192.168.20.80    192.168.20.130    SNMP    get-response 
1.3.6.1.4.1.4761.99.11.1.1.0

In the third frame, EngineBoots and EngineTime values are differents 
than EngineBoots and EngineTime values in the fourth frame so, If I'm 
not mistaken, the manager synchronizes with the agent with the fourth 
frame and in the next try the communication is possible (EngineBoots and 
EngineTime values are the same in the frames number 5 and 6)

But I use Wireshark with the snmp4j agents the result is shown below:

1    0.000000    192.168.20.130    192.168.20.80    SNMP    get-request
2    0.003408    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.4.0
3    0.058151    192.168.20.130    192.168.20.80    SNMP    get-request 
1.3.6.1.4.1.4761.99.11.1.1.0
4    0.062492    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.2.0
5    1.999864    192.168.20.130    192.168.20.80    SNMP    get-request 
1.3.6.1.4.1.4761.99.11.1.1.0
6    2.003975    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.2.0
7    4.000730    192.168.20.130    192.168.20.80    SNMP    get-request 
1.3.6.1.4.1.4761.99.11.1.1.0
8    4.005022    192.168.20.80    192.168.20.130    SNMP    report 
1.3.6.1.6.3.15.1.1.2.0

 From 1 to 4 is the same, but in the fifth frame the manager doen't 
syncronize with the agent and the communication isn't possible 
(EngineBoots and EngineTime values are different between agent and manager)

I was looking for a solution but I haven't been able to find one. I 
don't know if it a bug in the library or not.

I would appreciate your help.

Best regards,

Joaquin Suarez