Internet protocol based communication system and method for setting host address and selecting source address therein

A method for selecting a source address in an Internet protocol based communication system, comprising the steps of:

• a) designating areas near a host as a plurality of virtual cells and placing a router for transmitting and managing network information within each virtual cell;
• b) visiting the plurality of virtual cells by the host to receive network prefixes for the plurality of virtual cells from routers in order to label the network prefixes and to configure a table;
• c) setting by the host global IPv6 (Internet Protocol, version 6) addresses corresponding to the network prefixes;
• and
• d) selecting by the host an interface to which a global IPv6 address corresponding to a previously visited network among the global IPv6 addresses corresponding to the network prefixes configured in the table is set for a virtual cell being the previously visited network.

A method for setting a host address in an Internet protocol based communication system, comprising the steps of:

• a) a router creating a shorter label than a network prefix, the label being representative of the network prefix;
• b) the router transmitting an RA (Router Advertisement) message to a host that incorporates the label instead of the network;
• c) a host that receives the RA message reading the label to determine whether the read label matches a label in a prefix information table of the host;
• d) if the read label matches a label in the prefix information table, the host activating an interface ID (identifier) corresponding to the label of the prefix information table;
• and
• e) the host acquiring a global IPv6 (Internet Protocol, version 6) address corresponding to the activated interface ID as the host address.

A method for setting a host address in an Internet protocol based communication system, comprising the steps of:

• a) a router periodically transmitting an RA (Router Advertisement) message containing network prefix information to a host connected by a network to the router;
• b) in response to a request by the host to transmit the RA message containing only a label without the network prefix information, the router creating a shorter label than a network prefix, the label being representative of the network prefix, such that the router incorporates the label instead of the network prefix in the RA message and transmits the RA message to the host;
• c) the host receiving the RA message reading the label to determine whether the read label matches a label in a prefix information table of the host;
• and
• d) if the read label matches a label in the prefix information table, the host activating by an interface ID (identifier) corresponding to the read label of the prefix information table;
• and
• e) the host acquiring a global IPv6 (Internet Protocol, version 6) address corresponding to the activated interface ID as the host address.