United States Patent 7,764,686
Toebes,   et al. July 6, 2010

Migration to IPv6 using combination of globally significant and locally significant IPv4 addresses


Flexible migration from IPv4 to IPv6 is facilitated for the Internet and other data networks employing Internet Protocol. In one implementation, certain IPv4 nodes are enhanced by use of a dual address including a globally significant realm address and a locally significant address used only within a particular realm. This dual IPv4 address may be readily mapped to or from an IPv6 address. The enhancement and address mapping scheme may be used to automatically tunnel IPv6 packets through IPv4 infrastructure and to use enhanced IPv4 nodes to contact IPv6 infrastructure.

Inventors: Toebes; John (Cary, NC), Levy-Abegnoli; Eric (Nice, FR), Thubert; Pascal (La Colle sur Loup, FR)
Assignee: Cisco Technology, Inc. (San Jose, CA)
Appl. No.: 10/326,471
Filed: December 19, 2002


Full patent text at USPTO