Electronics and Telecommunications Research Institute

Jong-kuk Lee

Hyeong-Ho Lee

Hae-Won Jung

Sung-soo Kang

Ki-dong Nam

Sang-sig Nam

Disclosed is a method for determining a transmission path of a router system, in which a forwarding table of the router system is managed with a dualized address system including an absolute address indicating a physical port and a relative address indicating the place of the absolute address. Only the absolute address in a relative forwarding table can be changed without changing the relative address when traffic congestion occurs on a certain port of the router system or when load-balancing is needed, so that the router can actively cope with a real-time change of a destination address.

Method for determining transmission path of router system

A method for providing IP multicast service using a VLAN in a network including an IP multicast/VLAN manager for supporting an IGMP and a GVRP, and multicast group members, includes: after generating an IP multicast group, allowing a sender to request the IP multicast/VLAN manager to search for at least one host joining the IP multicast group; allowing the IP multicast/VLAN manager to check whether the host supports the VLAN; and allowing the sender to transfer a packet through the VLAN if the host joining the IP multicast group supports the VLAN and allowing the sender to broadcast a packet though IP multicast if not.

Method for providing IP multicast service using virtual LAN

Provided is a method and apparatus for assigning an Internet Protocol (IP) address using agents in a zero configuration network. The IP address assignment method involves: (a) receiving a registration request message of a user computer which contains a home agent IP address, and the ID and password of the user computer; (b) transmitting to the user computer an encoded address answer message which indicates permission of the address registration; and (c) setting up a network environment in the user computer by decoding the encoded address answer message. Problems of mobile IP extensibility and a dynamic host configuration protocol (DHCP) authentication are solved by applying the concept of a mobile Internet protocol agent to the protocol in a zero configuration network.

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Daejeon-si, South Korea

Jong-kuk Lee