A METHOD FOR IPV6 CLOUD DISCOVERY OVER IPV4 BACKBONE.

摘要

The present invention relates to IPv6 technology and particularly to a method for IPv6 cloud discovery over IPV4 backbone. This invention explains a method for IPv6 cloud discovery over ipv4 backbone in a network system comprising plurality of Dual-Stack Border Routers connected through IPv4 for providing IPv6 connectivity, the said method comprising the steps of: at the Dual-Stack Border Router/Host: Joining a multicast group/using shared-unicast for sharing IPv6 reachability information; Triggering Route Reachability Info request using ICMPv6 if no match to an IPv6 destination is found in the IPv6 routing table; Constructing ICMPv6 IPV6_ROUTE_INFO Request/Reply message; Encapsulating ICMPv6 IPV6_ROUTE_INFO Request message in an IPv4 packet and transmitting it to a multicast/shared-unicast destination; Decapsulating IPv4 packet containing ICMPV6 IPv6_ROUTE_INFO REQUEST/REPLY message after receiving it and processing; Triggering route lookup for IPv6 host/network address on processing IPv6_ROUTE_INFO REQUEST message; Constructing ICMPv6 IPV6_ROUTE_INFO REPLY message in response to IPV6_ROUTE_INFO Request; and Encapsulating ICMPv6 IPV6_ROUTE_INFO REPLY message in an IPv4 packet and transmitting it.