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United States Patent 8,341,295
Liu ,   et al. December 25, 2012
Server failover using IPV6 mobility features

Abstract
Techniques are provided for using the mobility support features of IPv6 to allow client and server nodes to communicate without the continuing intervention of a load-balancing node that selected the server node. A load-balancing node intercepts a TCP SYN packet addressed to a virtual IP address. The load-balancing node selects a server node from among multiple server nodes, and sends the packet toward the server node. The server node sends an IPv6 packet toward the client node. The packet contains a Binding Update option that specifies the virtual IP address as a Home Address. This information causes the client node to replace destination addresses in outgoing IP packets so that packets that the client node would have sent toward the virtual IP address are sent toward the selected server node's IP address instead. Consequently, the IP packets are routed toward the selected server node instead of the load-balancing node.

Inventors: Liu; Zaide (Cupertino, CA), Day; Richard David (Upton, MA), Swildens; Eric Sven-Johan (Mountain View, CA)
Assignee: Akamai Technologies, Inc. (Cambridge, MA)
Appl. No.: 13/435,417
Filed: March 30, 2012
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