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Disclosed is a system for IPv6 address failover using MobileIPv6 (*1). By using this system, multiple servers at different links can compose a IPv6 address failover system.
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IPv6 address failover system using MobileIP
Disclosed is a system for IPv6 address failover using MobileIPv6 (*1). By using this system, two (or more) servers on different links can compose a IPv6 address faileover system.
By using MobileIPv6, mobile nodes on different link (MN_A and MN_B) composed a IPv6 address failover system. MN_A and MN_B are conifugred to use the same home address (HomeAddr) and the same home agent (HA). Then only MN_A is activated as a mobile node. MN_A and MN_B communicate with each other as ordinary High Availability cluster system does. Fig. 1 and 2 illustrate the topology of this system and Fig.2 illustrates the block diagram.
HA gets binding update from MN_A and creates a binding of MN_A's current address,
AddrA, with HomeAddr. If a correspondent node, CN, sends a packet to HomeAddr, HA intercepts the packet.
HA forwards the intercepted packet to MN_A in regular MobileIPv6 manner.
MN_A replys the packet forwarded by HA and starts MobileIPv6 signalling with CN to
use MobileIPv6 route optimization. After MobileIPv6 signalling, CN sends packets to MN_A directly.
If MN_A fails for some reason and MN_B is aware of MN_A's failure, MN_B takes over
the network service which MN_A provides at HomeAddr. MN_B activates mobile node functionality and sends binding update to HA. Then HA
replaces the binding of MN_A. HA receives a packet from CN after receiving a biniding update from MN_B.
HA stops forwarding packets to MN_A and starts forwarding packets to MN_B