16.3.1.2 Specifying the Hostname Directly

The other methods of the SNMP protocol adaptor, one for each trap version, enable you to send a trap to a specified recipient:

• sendV1Trap( java.net.InetAddress address, java.lang.String cs, … )

• sendV2Trap( java.net.InetAddress address, java.lang.String cs, … )

• snmpV3UsmTrap( java.net.InetAddress address, contextName, … )

In the first two cases, these methods take an address and a community string, in addition to the version-specific trap information. The address is an InetAddress object that is usually instantiated by its static methods getLocalHost or getByName. The second method returns a valid InetAddress object when given a string representing a hostname or IP address.

The cs parameter is the community string, a name that the agent and manager exchange to help identify one another. The string given is used as the community when sending the trap PDU.

The SNMPv3 method also takes an InetAddress, but does not use the community string. Only use the manager's IP address when creating an SNMPv3 trap group, or the contextName to define the scope of the requests sent.

Either one of these methods sends a trap to a single manager using a single community string. The InetAddressAcl trap group mechanism is better suited to sending traps to multiple managers, though it requires you to set up a trap group. Note that even if a trap group is in use, the two methods above only send one trap to the specified host address.