System and method for communicating between ipv6 mobile ad-hoc network and external network

The invention in the IPv6 network reduces the network load for a connection to the external network, provides a system and method for efficient network formation. The present invention therefor is provided a system for performing the communication with the external network through the Internet gateway in a MANET network consisting of one or more nodes having a link local address, set the source address to the link-local address, and a destination address global and a source node for transmitting a packet data set to the address of the external network to the Internet gateway, which is from the source node destination upon receiving the external mangin packet data, corresponding to a source address of the packet data to the link-local address after converting the address and it characterized in that it comprises an Internet gateway for transmitting to the external network.