Communications system, apparatus and method therefor

Details Communications system, apparatus and method therefor Communications system, apparatus and method therefor

2007-01-09

2007-01-09

Pezzlo, John (Department: 2616)

Multiplex communications

Fault recovery

Bypass an inoperative switch or inoperative element of a...

C370S225000, C370S352000

Reexamination Certificate

active

09723019

ABSTRACT:
In the Internet, a domain can be multi-homed to a first and a second domain by a first path and a second path, respectively. If one of the first or second paths becomes unavailable, a path still remains to communicate with a host attached to the multi-homed domain. However, due to the requirements of IPv6 in relation to allocating addresses to domains, packets received via the remaining path during a communication will not be recognised by the host at a transport layer. Therefore, the present invention overcomes this problem by making use of a dynamic address variation facility of IPv6 used for mobile nodes. The dynamic address variation facility also, advantageously, can act as a replacement for a content switch and can maintain communication of packets to and from the host as a result of a change of IP address of the host caused by, for example, an administrative need to change the IP address of the host.

REFERENCES:
patent: 6480900 (2002-11-01), Habert
patent: 6501741 (2002-12-01), Mikkonen et al.
patent: 6587457 (2003-07-01), Mikkonen
patent: 6681259 (2004-01-01), Lemilainen et al.
patent: 6735202 (2004-05-01), Ahmed et al.
patent: 6742036 (2004-05-01), Das et al.

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