Ip address allocation system and method

A control device for use in a system in which a control plane is separated from a forwarding plane, the control device comprising:

• a communications unit, configured to communicate with an external network element;
• and
• a processor, configured to:
• acquire user characteristic information of user equipment (UE) and an internet protocol (IP) address allocated to the UE, and
• send first instruction information to a forwarder by using the communications unit, wherein the first instruction information is used to instruct the forwarder to send, when a packet whose destination address is the IP address is received, the packet to the UE according to the user characteristic information, wherein the forwarder is controlled by the control device.

An address allocation method for use in a system in which a control plane is separated from a forwarding plane, the method comprising:

• receiving, by a forwarder, an address request sent by an external network element, wherein the address request comprises a dynamic host configuration protocol (DHCP) request of user equipment (UE) and user characteristic information of the UE;
• acquiring, by the forwarder from a DHCP service network element according to the DHCP request, an internet protocol (IP) address allocated to the UE;
• acquiring, by the forwarder, first instruction information that is delivered by a control device according to the user characteristic information of the UE and the IP address allocated to the UE, wherein the first instruction information is used to indicate sending, when a packet whose destination address is the IP address is received, the packet to the UE according to the user characteristic information;
• and
• sending, by the forwarder, the IP address to the UE according to the user characteristic information.