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IP Address Assignment System, Dynamic Host Configuration Protocol Server, And Method Of Assigning An IP Address

  • US 20120311184A1
  • Filed: 05/30/2012
  • Published: 12/06/2012
  • Est. Priority Date: 05/31/2011
  • Status: Abandoned Application
First Claim
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1. An Internet Protocol (IP) address assignment system that assigns an IP address to a client, the system comprising:

  • a plurality of Dynamic Host Configuration Protocol (DHCP) servers that respectively are able to belong to a first network, wherein each of the DHCP servers includean address range storage that stores an exclusive address range corresponding to a range of IP addresses assignable to the client in an entire network address range representing an overall IP address range of the first network, wherein the exclusive address range does not overlap with an exclusive address range of another DHCP server;

    an address assignment controller that assigns an IP address to the client with a lease period when a request for assignment of new IP address is received from the client, wherein the IP address is included in the exclusive address range and the lease period represents a period between an assignment of the IP address and a cancellation of the assignment; and

    an extension permission controller that sends a permission for extension to the client, irrespective of whether an assigned IP address is included in the exclusive address range, as long as the assigned IP address is included in the entire network address range, when a request for extension of the lease period with regard to the assigned IP address is received from the client.

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