IP Address Assignment System, Dynamic Host Configuration Protocol Server, And Method Of Assigning An IP Address
First Claim
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.
1 Assignment
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Accused Products
Abstract
A DHCP server assigning an IP address to a client. The DHCP server stores an exclusive address range corresponding to a range of IP addresses assignable to the client, 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, and 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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Citations
16 Claims
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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 include an 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A Dynamic Host Configuration Protocol (DHCP) server assigning an Internet Protocol (IP) address to a client and being able to belong to a first network, the DHCP server comprising:
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an 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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of assigning an Internet Protocol (IP) address to a client using a plurality of Dynamic Host Configuration Protocol (DHCP) servers that respectively are able to belong to a first network, the method comprising:
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assigning an IP address included in an exclusive address range to the client with a lease period representing a period between an assignment of the IP address and a cancellation of the assignment in each DHCP servers, when a request for assignment of new IP address is received from the client wherein the exclusive address range is stored in a memory of each DHCP server, the 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, and the exclusive address range does not overlap with an exclusive address range of another DHCP server; and sending a permission for extension to the client from each DHCP server, 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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16. A method of assigning an Internet Protocol (IP) address to a client using a Dynamic Host Configuration Protocol (DHCP) server that is able to belong to a first network, the method comprising:
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assigning an IP address included in an exclusive address range to the client with a lease period representing a period between an assignment of the IP address and a cancellation of the assignment in a DHCP server, when a request for assignment of new IP address is received from the client, wherein the exclusive address range is stored in a memory of the DHCP server, the 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, and the exclusive address range does not overlap with an exclusive address range of another DHCP server; and sending a permission for extension to the client in a DHCP server, 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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Specification