[SNMP4J] SNMP v3 Traps, Cannot receive from device

[Frank Fock]

Hello Ramsey,

I think the problem is that you did not specify a specific port
you want to listen on. By default any free port is used. So
there is only a small chance that it is port 162.

To fix the code, just replace "new DefaultUDPTransportMapping()"
by "new DefaultUDPTransportMapping("0.0.0.0/162")".

Best regards,
Frank

Ramsey Hage wrote:

>Hello,
> 
>I am interested in receiving SNMPv3 traps to my SNMP manager, using
>SNMP4J 1.5,
>JDK5.0 (on startup of manager).
> 
>According to SNMP standards, traditional SNMP managers require a 
>"Notification Receiver Application" to handle the incoming trap.  It
>seems that
>to handle SNMPv3 traps with SNMP4J, we need to instantiate a
>CommandResponder.
>1) Is this correct?
>2) I have tried it, with no success.  I am not receiving the trap
>(below).
> 
>I am planning to keep a static variable for "Snmp" class, register a
>CommandResponder 
>instance to the static Snmp instance, and use the static Snmp instance
>to send requests
>and handle the traps.
> 
>The manager calls the initialize, at startup.  I expect to be able to
>receive the trap (below)
>after this call is done.  I am not receiving it.
> 
>Please advise, am I doing something wrong?
> 
>________________________________
>
>Actual Code Snipet:
>________________________________
>
>public class X {
>    private static Snmp snmp = null;
>            
>    public X() {
>    }
>    
>    public static void initialize() {
>        try {
>            TransportMapping transport = new
>DefaultUdpTransportMapping();
>            snmp = new Snmp(transport);
>            MPv3 mpv3 =
> 
>(MPv3)snmp.getMessageProcessingModel(MessageProcessingModel.MPv3);
>            
>            USM usm = new USM(SecurityProtocols.getInstance(),
>                              new OctetString("abcd"), 0);
>            SecurityModels.getInstance().addSecurityModel(usm);
>            transport.listen();
>        }
>        catch (IOException e1) {
>            e1.printStackTrace();
>        }
> 
>        CommandResponder trapPrinter = new CommandResponder() {
>                public synchronized void
>processPdu(CommandResponderEvent e) {
>                    e.setProcessed(true);
>                    System.out.println("Caught");    // Not hit, PROBLEM
>!!!!!!!
>                }
>        };
>        snmp.addCommandResponder(trapPrinter);
>        snmp.getUSM().addUser(
>                new OctetString("admin"),
>                new UsmUser(   new OctetString("admin"),
>                                        AuthMD5.ID,
>                                        new OctetString("bulu1234"),
>                                        PrivDES.ID,
>                                        new
>OctetString("MD5DESUserPrivPassword")));
>    }
> 
> 
>________________________________
>
>Captured SNMP trap on network:
>________________________________
>
>Frame 17 (153 bytes on wire, 153 bytes captured)
>Ethernet II, Src: 00:0f:4d:00:01:16, Dst: 00:20:18:2c:10:6d
>Internet Protocol, Src Addr: 192.168.0.105 (192.168.0.105), Dst Addr:
>192.168.0.188 (192.168.0.188)
>User Datagram Protocol, Src Port: snmp (161), Dst Port: snmptrap (162)
>Simple Network Management Protocol
>    Version: 3 (3)
>    Message Global Header
>        Message Global Header Length: 13
>        Message ID: 1
>        Message Max Size: 2000
>        Flags: 0x00
>            .... .0.. = Reportable: Not set
>            .... ..0. = Encrypted: Not set
>            .... ...0 = Authenticated: Not set
>        Message Security Model: USM
>    Message Security Parameters
>        Message Security Parameters Length: 25
>        Authoritative Engine ID: 61626364
>        Engine Boots: 2
>        Engine Time: 0
>        User Name: admin
>        Authentication Parameter: 
>        Privacy Parameter: 
>    Context Engine ID: 61626364
>    Context Name: lan
>    PDU type: TRAP-V2 (7)
>    Request Id: 0x00000001
>    Error Status: NO ERROR (0)
>    Error Index: 0
>    Object identifier 1: 1.3.6.1.2.1.1.3 (SNMPv2-MIB::sysUpTime)
>    Value: Timeticks: (12) 0:00:00.12
>    Object identifier 2: 1.3.6.1.6.3.1.1.4.1 (SNMPv2-MIB::snmpTrapOID)
>    Value: OID: SNMPv2-MIB::coldStart 
>________________________________
>
>    
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