Abstract: An apparatus and control method for multicast traffic forwarding in a system supporting Point-to-Point Protocol (PPP) multi-link includes: a memory adapted to store a received frame and a buffer handler having meta data information; and a network processor adapted to: store the frame received from an external network interface card in the memory; store the buffer handler indicating the frame and as many buffer handlers as either frame copies for multicasting or fragments for multi-linking; check the buffer handler stored in the memory and then to copy and transmit the corresponding frame stored in the memory via a corresponding port upon transmitting the frame to an external network interface card; and delete corresponding buffer handlers after transmitting the frame to the external network interface card, thereby managing forwarding of the frame.

Abstract: In a network system using dynamic addresses, an address management server assigns dynamic addresses to hosts attempting to use the dynamic addresses in response to dynamic address requests from the hosts, and a router manages packet exchange between hosts connected to the network system based upon authenticated dynamic address information. In a method for assigning dynamic addresses in a network, dynamic addresses are assigned to hosts attempting to use the dynamic addresses in response to a request therefrom, the dynamic address information of assigned dynamic addresses is delivered to the host, and the dynamic address assignment information is registered in a dynamic address management table. In this way, invasion of the network by malicious hosts is prevented.