Hi,
I implemented a simple snmp4j trap listener a while ago which has been
receiving SNMPv1 and SNMPv2c traps without any issue. Recently I noticed that
my trap listener is not receiving v3 traps. According to the following snmp4j
documentation, to receive v3 traps, I have to add the highlighted code with the
v3 USM configured. My system allows various v3 credentials to be configured on
the agents and the v3 credentials are not naturally known to the trap listener.
I'm wondering if snmp4j allows disabling v3 trap authentication in some way so
that my current trap listener code can also receive v3 traps without having to
configure USM?
Example for Receiving SNMP Messages
import org.snmp4j.*;
import org.snmp4j.smi.*;
import org.snmp4j.mp.SnmpConstants;
...
TransportMapping transport =
new DefaultUdpTransportMapping(new UdpAddress("0.0.0.0/161"));
Snmp snmp = new Snmp(transport);
if (version == SnmpConstants.version3) {
byte[] localEngineID =
((MPv3)snmp.getMessageProcessingModel(MessageProcessingModel.MPv3)).createLocalEngineID();
USM usm = new USM(SecurityProtocols.getInstance(),
new OctetString(localEngineID), 0);
SecurityModels.getInstance().addSecurityModel(usm);
snmp.setLocalEngine(localEngineID, 0, 0);
// Add the configured user to the USM
...
}
snmp.addCommandResponder(this);
snmp.listen();
...
public synchronized void processPdu(CommandResponderEvent e) {
PDU command = e.getPdu();
if (command != null) {
...
}
}
Thanks,
Hoiying
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