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SNMP4j - Cannot send RESPONSE PDU on some OID


SNMP4j - Cannot send RESPONSE PDU on some OID

By : Afonso Silva
Date : November 21 2020, 07:31 AM
this will help After setting up a VM and checking with Wireshark, it turned out I forgot to set, on the response PDU, the same request ID than the GET PDU.
code :
CommunityTarget comm = new CommunityTarget(event.getPeerAddress(), new OctetString(event.getSecurityName()));
comm.setSecurityLevel(event.getSecurityLevel());
comm.setSecurityModel(event.getSecurityModel());
PDU resp = new PDU(PDU.RESPONSE, responses);
resp.setRequestID(pdu.getRequestID()); // Forgot that!
snmp.send(resp, comm);


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How do I send a SNMP trap to multiple managers using snmp4j?

How do I send a SNMP trap to multiple managers using snmp4j?


By : user3590923
Date : March 29 2020, 07:55 AM
hope this fix your issue You need to define one CommunityTarget for each manager. If there is more than one, it probably should go in a for loop, fetching their addresses from a file or other source.
SNMP response is null [SNMP4j]

SNMP response is null [SNMP4j]


By : Pasha P
Date : March 29 2020, 07:55 AM
may help you . I've hit kind of a brick wall. I got a small system that communicate with DSLAM's by SNMP. Everything has worked fine for a couple of months, but when I recently added a new DSLAM to the system, I couldn't get an answer from it. Tried the other IP's and didn't have a problem. , Well, as a friend pointed out 192 does not equal 195.
SNMP4J: Which SNMP4J Jar should be used to write a SNMP agent?

SNMP4J: Which SNMP4J Jar should be used to write a SNMP agent?


By : T.bashiri
Date : March 29 2020, 07:55 AM
this will help An agent is some kind of server: it mainly replies to requests (it may occasionally also send traps to managers).
A manager is a some kind of client: it mainly send requests to agents (it may occasionally also receive traps from managers).
Heartbeat SNMP4J: How to send SNMP heartbeat message using SNMP4J?

Heartbeat SNMP4J: How to send SNMP heartbeat message using SNMP4J?


By : astDev
Date : March 29 2020, 07:55 AM
To fix this issue Usually, it is the other way around. The NMS keeps a track of the network elements connected to it. Anyway, from any side if you want to perform heartbeat the concept is - Periodically poll the agent for these two scenarios.
The agent replies back which mean that the agent is up and running. No reply from the agent after certain no of retries, which means the agent is down. Do the follow-up action.
How to send v3 trap with enginedId using snmp4j

How to send v3 trap with enginedId using snmp4j


By : user2770533
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I had the same issue. I was using snmp4j 2.5.3 and Java 1.7. You can use a higher version of snmp4j lib with Java 1.8.
So when you add a user to USM with an engine id and send the Pdu, this engine id is not actually used to extract the UsmUserEntry from the userTable. In fact the localEngineID is used to extract the UsmUserEntry. Hence the UsmUserEntry object becomes null and you get an exception as "Message processing model 3 returned error: Unknown security name".
code :
USM usm = new USM(SecurityProtocols.getInstance(),  new OctetString(MPv3.createLocalEngineID()), 0);

SecurityModels.getInstance().addSecurityModel(usm);

//Add engine id while addinf user
snmp.getUSM().addUser(new OctetString(username), new OctetString("12345"),
                        new UsmUser(new OctetString(username), AuthSHA.ID, new OctetString(authpassphrase), PrivAES192.ID, new OctetString(privacypassphrase)));

//set the same engine to localEngineId
snmp.setLocalEngine(new OctetString("12345").getValue(),0,0);
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