Checkpoint Routines

A user-defined object must implement at least one of the following checkpoint routines.

The routines are more thoroughly described in the following sections.

messageReceived
The messageReceived routine lets you add an external means of authentication to each received DHCP or BOOTP message.
addressOffered
The addressOffered routine is used for accounting. Parameters passed to the routine are read-only. The routine has no return code to prevent sending the outgoing message.
addressAssigned
The addressAssigned routine can be used for accounting purposes or to add an external means of name and address association.
addressReleased
The addressReleased routine is used for accounting when DHCP clients are ready to be sent an address OFFER message. Parameters given to the routine are read-only.
addressExpired
The addressExpired routine is used for accounting when any DHCP database detects an association must be cancelled because the address and client identifier association has existed beyond the end of the offered lease.
addressDeleted
The addressDeleted routine is used for accounting when any address association is explicitly deleted from lack of interaction with the client or because of a lease expired.
addressDeclined
The addressDeclined routine is used for accounting purposes when a DHCP client indicates to the server (through the DHCP DECLINE message type) that the given address is in use on the network.

Parent topic: User-Defined Object Requirements