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Traps are unsolicited messages sent by the agent to the management applications to report the conditions of the managed node. The trapreceiver example can be used to receive the traps sent by the agents. For example:
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java trapreceiver |
The above command waits for the trap in the port 162, the default port for receiving traps, and prints the received traps. In some operating systems, such as Unix, some ports are accessible only for users with root privileges. The following error occurs, if the port is not accessible.
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Error: com.adventnet.snmp.snmp2.SnmpException: java.net.BindException: Permission denied |
In such cases, you can specify the port in which the trap can be received as follows.
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java trapreceiver -p 8001 |
Here, the traps are received in the port 8001. For example, the following v1 trap:
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java sendtrap -p 8001 -m ../../mibs/RFC1213-MIB remotehost 1.2.0 localhost 0 6 1000 1.5.0 testing |
gives the following output in the trapreceiver demon.
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Got a trap from: xx.xx.xx.xx SNMP Trap PDU SNMP Version: Version 1 Remote Host: xx.xx.xx.xx Remote Port: 1430 Community: public Request ID: 0 Timeout: 0 Retries: 0 Enterprise: .1.3.6.1.2.1.1.2.0 Trap Type: 0 Specific Type: 6 UpTime: 1000 Error Status: no error SNMP PDU Variable Bindings: Object ID: .1.3.6.1.2.1.1.5.0 STRING: testing |
The output of the trapreceiver is different if we send a v2c/v3 trap.
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java sendv2trap -p 8001 -m ../../mibs/RFC1213-MIB remotehost 5000 1.2.0 1.5.0 test |
Output of the trapreceiver is:
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Got a trap from: 192.168.1.40 SNMP V2 Trap PDU SNMP Version: Version 2C Remote Host: 192.168.1.40 Remote Port: 1436 Community: public Request ID: 2 Timeout: 0 Retries: 0 Error Status: no error SNMP PDU Variable Bindings: Object ID: .1.3.6.1.2.1.1.3.0 TIMETICKS: 0 hours, 0 minutes, 50 seconds. Object ID: .1.3.6.1.6.3.1.1.4.1.0 OBJID: .1.3.6.1.2.1.1.2.0 Object ID: .1.3.6.1.2.1.1.5.0 STRING: test |
Source
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High-level API |
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Low-level API |
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MIB Support API |
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RMI API |
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CORBA API |
Usage
The usage of the trapreceiver utility is provided below.
java snmptrapd [-v version(v1,v2)] [-m MIB_files] [-c community] [-p port]
java rmitrapreceiver [-SnmpServer hostname] [-m MIB_files] [-c community] [-p port] [-u user] [-e engineID] [-a authProtocol] [-w auth_password] [-pp privProtocol(DES/AES-128/AES-192/AES-256/3DES)] [-s priv_password]
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