1. WHAT IS DHCP CLIENT?
The MikroTik RouterOS DHCP client may be enabled on any Ethernet-like interface at a time. The client will accept an address, netmask, default gateway, and two dns server addresses. The received IP address will be added to the interface with the respective netmask. The default gateway will be added to the routing table as a dynamic entry. Should the DHCP client be disabled or not renew an address, the dynamic default route will be removed.
2. CRATE DHCP CLIENT
IP => DHCP Client
RESOURCE:
http://wiki.mikrotik.com/wiki/Manual:IP/DHCP_Client