Dynamic Host Configuration Protocol Server Exit Programs

The iSeries^(TM) Dynamic Host Configuration Protocol (DHCP) server assigns and releases TCP/IP addresses from client hosts in a network. Exit points have been provided so that user-written programs can be called from the running DHCP server. They allow for customer-supplied security validation of incoming client requests, as well as notification when IP addresses are assigned or released.

The DHCP Request Packet Validation exit program allows for incoming client request packets to be screened by a user program that starts any processing on it. The user program is able to communicate back to the DHCP server that either the packet should be discarded or that it should be allowed to process.

The Address Binding Notification exit program and the Address Release Notification exit program are for notification purposes only. These allow for user applications to keep track of which IP addresses are currently in use and by which clients.

The Dynamic Host Configuration Protocol Server exit programs are:

• DHCP Address Binding Notification allows for notification each time the Dynamic Host Configuration Protocol (DHCP) server assigns an IP address to a specific host.
• DHCP Address Release Notification allows for notification each time the DHCP server releases an IP address from its specific client host assignment binding.
• DHCP Request Packet Validation provides additional control for restricting which incoming DHCP and Bootstrap Protocol (BOOTP) message request packets from client hosts are processed by their DHCP server, and which are rejected.