If you need even finer control over DHCP, you can take a look at the: xApplicationDHCPHook_Multi, this user implemented hook function is called by the DHCP state machine at multiple phases of the DHCP process. If you wish to stop the DHCP process in the middle for a particular endpoint - pxEndPoint you can make this hook function return - eDHCPUseDefaults, causing the TCP/IP stack to use the static IP settings.