Method and system for automatic allocation of resources in a network

• US 6,009,103 A
• Filed: 12/23/1997
• Issued: 12/28/1999
• Est. Priority Date: 12/23/1997
• Status: Expired due to Term

• Current Assignee: Comcast MO Group Incorporated (Comcast Corporation)
• Original Assignee: MediaOne Group Inc. (Comcast Corporation), U S West Inc.
• Inventors: Woundy, Richard
• Primary Examiner(s): Jung, Min
• Application Number:
  US08/997,279
• Time in Patent Office: 735 Days
• Field of Search: 370/389, 370/400, 370/401-410, 370/431, 370/462, 370/463, 370/468, 370/420, 709/225, 709/226, 709/250
• US Class Current: 370/401
• CPC Class Codes: H04J 3/1694 Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers Passive Optical Networks H04Q11/0062
• CPC Class Codes: H04L 61/4511 using domain name system [DNS]
• CPC Class Codes: H04L 61/4523 using lightweight directory access protocol [LDAP]
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04L 61/5053 Lease time; Renewal aspects
• CPC Class Codes: H04L 61/5076 Update or notification mechanisms, e.g. DynDNS

Abstract

In a broadband cable data network, a method and system for automatically allocating network resources such as IP addresses to control access to the network utilizes at least one DHCP server, and a common network database formed from a LDAP directory for storing respective user configuration parameters, hardware address registration, and current binding information. A DHCP server can add new hardware address registrations to the LDAP using an "unregistered" service class. The DHCP server sends a DHCP reply tailored for unregistered devices, such as by allocating a privately-allocated IP address with no Internet access, or an IP address for a self-provisioning web server. A DHCP server views IP address allocation as indefinite, while a user will view an IP address allocation as having a short duration. Thus, if the IP network configuration does not change, the user terminal will continue to receive the same allocated IP address due to the DHCP server'"'"'s perception of an indefinite lease. The consistency of the IP addresses simplifies many operational concerns about dynamic addresses, such as minimizing DNS (domain name service) hostname updates, mapping IP addresses to user terminals during security incidents, etc.

Claims

1. In a broadband cable data network where information is distributed from at least one DHCP server to a plurality of user terminals, a method for automatically allocating network resources to control access to the network comprising:

generating a discover message from a user wanting to receive allocation of a network resource;

at a DHCP server, detecting user identification information from the discover message to determine whether an address entry is currently stored for the user;

creating an unregistered class entry and assigning a temporary IP address to the user which allows only limited access rights to the network if an address entry does not exist; and

sending an offer message which communicates the temporary IP address to allow limited access to a network user registration service.

2. The method of claim 1 wherein said IP address is tagged temporarily in use.

3. The method of claim 1 wherein the IP address is temporarily assigned, and is stored as an address entry.

4. The method of claim 1 further comprising a user selecting an DHCP offer by sending a request message identifying the offering server.

5. The method of claim 4 further comprising determining whether an address entry is currently stored based on identification information received in the request message, and sending an acknowledgment message if an address entry exists indicating a temporary address has been assigned.

6. The method of claim 5 further comprising registering the user by changing the assigned IP address from a temporary, limited access IP address to a permanently in use IP address having a predetermined duration of valid use.

7. The method of claim 1 further comprising a user selecting an DHCP offer by sending a request message not identifying a server.

8. The method of claim 4 further comprising determining whether an address entry is currently stored based on identification information received in the request message, and sending an acknowledgment message if an address entry exists indicating a temporary address has been assigned.

9. The method of claim 1 further comprising determining at the user a duplicate assigned IP address, and sending a decline message to the DHCP server indicating nonacceptance of the offer.

10. The method of claim 1 further comprising sending a release message from the user to cause premature termination of the IP address assignment.

11. The method of claim 1 wherein assignment of the temporary address is automatically reset after a predetermined period of time.

12. The method of claim 1 further comprising determining a user type based on the identification information, and creating an unregistered class entry and assigning a temporary IP address only if the user type is one of an acceptable type of user device.