Method and system for setting and managing externally provided internet protocol addresses using the dynamic host configuration protocol

• US 6,212,563 B1
• Filed: 10/01/1998
• Issued: 04/03/2001
• Est. Priority Date: 10/01/1998
• Status: Expired due to Term

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: 3Com Corporation (HP Inc.)
• Inventors: Beser, Nurettin B.
• Primary Examiner(s): VU, VIET DUY
• Application Number:
  US09/164,744
• Time in Patent Office: 915 Days
• Field of Search: 709/217, 709/219, 709/223, 709/225, 709/226, 709/227, 709/228, 709/229, 709/237
• US Class Current: 709/227
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04N 21/42684 Client identification by a unique number or address, e.g. serial number, MAC address, socket ID network arrangements, protocols or services for addressing or naming H04L61/00
• CPC Class Codes: H04N 21/6118 involving cable transmission, e.g. using a cable modem
• CPC Class Codes: H04N 21/6402 Address allocation for clients address allocation in data networks H04L61/50
• CPC Class Codes: H04N 7/165 Centralised control of user terminal subsequent to an upstream request signal H04N7/17345; Registering at central by two-way working H04N7/17309

Abstract

A system and method for allocating IP addresses for network devices using the dynamic host configuration protocol (DHCP) wherein the DHCP server returns the requested IP address every time the IP address is requested. A client identifier is generated for each network device as a function of the IP address. The client identifier is used in the DHCP options field of the DHCP parameter list in a DHCPDISCOVERY message. The DHCP server indexes the network device configuration parameters according to the client identifier and returns the same IP address each time the DHCP is queried.

Claims

1. A method for permanently allocating an Internet protocol (IP) address for a network device in a network using a dynamic host configuration protocol (DHCP) server comprising the steps of:

generating a unique client identifier using the IP address in a client identifier function;

setting the IP address in a selected IP address parameter and the client identifier in an options parameter field in a DHCP parameter list;

sending the DHCP parameter list in a DHCPDISCOVER message to the DHCP server;

receiving a DHCPOFFER message from the DHCP server; and

using the IP address and the client identifier in subsequent DHCP messages to the DHCP server.

2. A method as claimed in claim 1 further comprising the step of maintaining the client identifier and the IP address for the network device using a Client ID generator.

3. A method as claimed in claim 2 further comprising the step of generating at least one client identifier using the IP address.

4. A method as claimed in claim 3 further comprising the step of determining the IP addresses of the network devices by querying the DHCP server using the client identifiers of the network devices.

5. A method as claimed in claim 1 wherein the network devices are cable modems.

6. A method as claimed in claim 5 wherein the cable modems are connected to a cable modem termination system.

7. A method as claimed in claim 6 wherein the cable modem includes the Client ID generator.

8. A method as claimed in claim 5 wherein the cable modems are connected on an upstream connection to a telephony return access concentrator and on a downstream connection to a cable modem termination system.

9. A method as claimed in claim 8 wherein the telephony return access concentrator generates an original IP address for each cable modem.

10. An improved system for allocating an Internet protocol (IP) address to a network device connected to a network having a dynamic host configuration protocol (DHCP) server, the improvement comprising:

an Client ID generator for generating a client identifier as a function of the IP address; and

a DHCP parameter list having a selected IP address set to the IP address and a DHCP option field set to the client identifier.

11. The improved system as claimed in claim 10 wherein the network device is a cable modem.

12. The improved system as claimed in claim 11 wherein the cable modem is connected to a cable modem termination system.

13. The improved system as claimed in claim 12 wherein the cable modem includes the Client ID generator.

14. The improved system as claimed in claim 11 wherein the cable modem includes an upstream connection to a telephony return access concentrator.

15. A method for permanently allocating an Internet protocol (IP) address for a network device in a network using a server having means for allocating IP addresses comprising the steps of:

generating a unique client identifier using the IP address in a client identifier function;

setting the IP address in a selected IP address parameter and the client identifier in an options parameter field in a server parameter list;

sending the server parameter list in a server message to the server having means for allocating IP addresses;

receiving a server IP address offer message from the server having means for allocating IP addresses; and

using the IP address and the client identifier in subsequent server messages to the server having means for allocating IP addresses.

16. A method as claimed in claim 15 further comprising the step of maintaining the client identifier and the IP address for the network device using a Client ID generator.

17. A method as claimed in claim 16 further comprising the step of generating at least one client identifier using the IP address.

18. A method as claimed in claim 17 further comprising the step of determining the IP addresses of the network devices by querying the server having means for allocating IP addresses using the client identifiers of the network devices.

19. An improved system for allocating an Internet protocol (IP) address to a network device connected to a network having a server providing means for allocating IP addresses, the improvement comprising:

an Client ID generator for generating a client identifier as a function of the IP address; and

a server parameter list having a selected IP address set to the IP address and a server option field set to the client identifier.