Apparatus connected to network, and address determination program and method

• US 7,443,862 B2
• Filed: 12/27/2002
• Issued: 10/28/2008
• Est. Priority Date: 01/22/2002
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Nishio, Masahiro
• Primary Examiner(s): Pham; Chi H.
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US10/329,389
• Publication Number:
  US 20030140283A1
• Time in Patent Office: 2,132 Days
• Field of Search: 370/389, 370/390, 370/392, 370/393, 370/395.54, 370/432, 370/475, 709/219, 709/245
• US Class Current: 370/395.54
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 61/5092 by self-assignment, e.g. picking addresses at random and testing if they are already in use
• CPC Class Codes: H04L 61/58 Caching of addresses or names

Abstract

A network-capable device stores an address of another device. The network-capable device determines whether or not a connected network has been changed. If it has not been changed, then an address other than the address of the other device stored is determined as an address of the apparatus.

Claims

1. An apparatus connected to a network, comprising:

communication means for communicating with another device over a network;

determination means for determining an address of the apparatus; and

memory means for storing a first address which was used by the apparatus when the apparatus was connected to the network and for storing a second address which was used by another device which was connected to the network,

wherein said determination means determines whether or not there is a device which uses the second address stored in said memory means, and determines that the first address stored in said memory means is reused as the address of the apparatus if there is the device which uses the second address stored in said memory means.

2. The apparatus according to claim 1, wherein said determination means determines an address other than the second address stored in said memory means as the address of the apparatus if there is the device which uses the address stored in said memory means.

3. The apparatus according to claim 1, wherein said determination means controls depending on traffic on the network a transmission of a signal for use in checking whether or not there is the device which uses the first address.

4. A computer-readable medium for storing a computer program to be executed by an apparatus for determining an address of the apparatus, the computer program, comprising:

an obtaining step of obtaining a first address which was used by the apparatus when the apparatus was connected to a network and obtaining a second address which was used by another device which was connected to the network;

a determining step of determining whether or not there is a device which uses the second address obtained in said obtaining step; and

a reusing step of reusing the first address obtained in said obtaining step as the address of the apparatus when there is the device which uses the second address obtained in said obtaining step.

5. The program according to claim 4, wherein in said reusing step, when there is the device which uses the first address obtained in said obtaining step, an address other than the second address obtained in said obtaining step is determined as the address of the apparatus.

6. The program according to claim 4, wherein in said reusing step, a transmission of a signal for use in checking whether or not there is the device which uses the first address is controlled depending on traffic on the network.

7. An address determination method for determining an address of an apparatus, the method comprising:

an obtaining step of obtaining a first address which was used by the apparatus when the apparatus was connected to a network, and obtaining a second address which was used by another device which was connected to the network;

a determining step of determining whether or not there is a device which uses the second address obtaining step; and

a reusing step of reusing the first address obtained in said obtaining step as the address of the apparatus when there is the device which uses the second address obtained in said obtaining step.

8. The method according to claim 7, wherein in said reusing step, when there is the device on the network which uses the first address obtained in said obtaining step, an address other than the second address obtained in said obtaining step is determined as the address of the apparatus.

9. The method according to claim 8, wherein in said reusing step, a transmission of a signal for use in checking whether or not there is the device which uses the first address is controlled depending on traffic on the network.