Linux/DHCP

Release Address
dhclient -r -v eth0

Request Address
dhclient -v eth0

Request Specific Address
/etc/dhcp/dhclient.conf: send dhcp-requested-address 192.168.1.240;

Ref:
 * networking - How do i make ubuntu request a specific ip address from a dhcp server? - Ask Ubuntu - https://askubuntu.com/questions/246121/how-do-i-make-ubuntu-request-a-specific-ip-address-from-a-dhcp-server
 * networking - How to request a specific IP address from DHCP server? - Super User - https://superuser.com/questions/487607/how-to-request-a-specific-ip-address-from-dhcp-server