IPv6 기반 이동 Ad Hoc 망 환경에서 멀티캐스트 데이터 포워딩의 설계 및 구현

Abstract

Support of multicast data forwarding is needed to transmit multicast packets with multicast routing table in mobile ad hoc environment. In wired networks, a network interface of a node has an one-to-one connection to one of the incoming interfaces of other nodes. If the packet coming into an incoming interface needs to be forwarded, it is delivered to the corresponding outgoing interface. However, in wireless ad hoc networks, in most cases each node has only one network interface, so the incoming interface is the same as the outgoing one and the wireless network interface of a node has an one-to-many connection to those of neighboring nodes. Problems such as packet duplication and routing loop can happen in case we do not consider the differences. This paper designs and implements multicast data forwarding mechanism for IPv6-based mobile ad hoc networks, which uses netfilter of linux operating system and a table to prevent packet duplication, and efficiently supports multicast data forwarding using the paths determined by a tree-based multicast routing protocol.