Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2005-10-24
2010-06-01
D'Agosta, Stephen M (Department: 2617)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S310200, C370S338000, C370S393000, C370S400000, C370S401000, C455S414100, C455S414200, C455S418000, C455S432100, C455S432300, C455S436000, C709S210000, C709S217000, C709S230000, C709S245000
Reexamination Certificate
active
07729314
ABSTRACT:
Methods and apparatus for preventing an IP address from being assigned to a client implementing a protocol such as DHCP are disclosed. This is particularly useful in an environment such as a Mobile IP environment in which a network device (e.g., Access Point) performs proxy registration on behalf of the client. When the client transmits a detection packet to detect whether its IP address is still valid (e.g., whether it is on the same sub-network on which the IP address was allocated), a response is transmitted to the client that indicates that the client is still on its home network. This response is transmitted regardless of whether the client is still on its home network. Since the client believes it is still on its home network, a new IP address will not be assigned to the client. As a result, an existing Mobile IP session will not be interrupted.
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Leung Kent K.
McMurdo Bruce A.
Siddiqi Waseem
Cisco Technology Inc.
D'Agosta Stephen M
Weaver Austin Villeneuve & Sampson LLP
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