METHOD AND APPARATUS FOR AUTOMATICALLY RESOLVING CONFLICTING DEVICES ON A NETWORK

• US 20120131197A1
• Filed: 06/21/2011
• Published: 05/24/2012
• Est. Priority Date: 11/23/2010
• Status: Abandoned Application

• Current Assignee: Sensormatic Electronics LLC (Johnson Controls International plc)
• Original Assignee: Sensormatic Electronics LLC (Johnson Controls International plc)
• Inventors: Prentice, Mark, Tremblay, Yannick
• Application Number:
  US13/164,805
• Publication Number:
  US 20120131197A1
• Time in Patent Office: Days
• US Class Current: 709/226
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092

Abstract

A method and apparatus are disclosed for automatically detecting and resolving conflicts between devices on a security network by comparing the IP addresses of all devices on the network. When one or more conflicts are detected, the user is presented with the option of reassigning the conflicting device to a DHCP address, or to a new static IP address. The new static IP address can be configured to lie within a user defined range. In one embodiment, a default changes the address to any free address on the network. The disclosed method and apparatus automates the conflict resolution process without requiring that network devices (e.g., cameras, camera encoders) be individually and sequentially connected to the security network in order to resolve conflicts. The disclosed approach results in reduced human interaction and is much faster than the traditional approach of adding devices one at a time to the network. Other embodiments are also disclosed.

Claims

1. A method for resolving conflicts in IP addresses for a plurality of devices on a network, comprising:

identifying at least first and second devices associated with a network as having a same IP address;

determining a first IP address in an IP address range as being free for allocation to one of the first and second devices;

adding an entry to an address resolution protocol (ARP) table to route TCP/IP commands to the first or second device;

correlating an original IP address of the first or second to a media access control (MAC) address of that device;

sending a command to change the IP address of the first or second device to the first IP address;

reclassifying the first IP address as no longer being free for allocation; and

clearing the entry in the ARP table so that so that TCP/IP commands can be routed to other conflicting devices.

2. The method of claim 1, wherein the determining step comprises checking the first IP address against a list of IP addresses of devices known to be present on the network.

3. The method of claim 1, comprising verifying that the first address is free using a network scanning mechanism.

4. The method of claim 3, wherein the network scanning mechanism comprises a ping or a portmap.

5. The method of claim 1, wherein at least one of the plurality of devices comprises a video camera.

6. The method of claim 1, wherein when the first IP address is determined to be unavailable, selecting a next IP address and determining whether the next IP address is free for allocation.

7. The method of claim 1, wherein the IP address range is user-defined.

8. The method of claim 7, wherein the command to change the IP address of the first or second device comprises a TCP/IP command.

9. The method of claim 1, comprising determining whether a second targeted device is listed in a list of devices to be cleared of conflicting IP addresses;

and repeating said determining, adding, correlating, sending and reclassifying steps for the second targeted device.

10. The method of claim 1, wherein if the first IP address is determined to be not free, determining whether a next IP address is free.

11. The method of claim 10, comprising repeating the determining step until a free address is identified.

12. A system for resolving conflicts in IP addresses for a plurality of devices on a network, the system comprising a processor and a memory, a plurality of IP addressable devices, and a machine-readable storage medium encoded with a computer program code such that, when the computer program code is executed by a processor, the processor performs a method comprising:

identifying at least first and second devices associated with a network as having a same IP address;

determining a first IP address in an IP address range as being free for allocation to one of the first and second devices;

adding an entry to an address resolution protocol (ARP) table to route TCP/IP commands to the first or second device;

correlating an original IP address of the first or second to a media access control (MAC) address of that device;

sending a command to change the IP address of the first or second device to the first IP address;

reclassifying the first IP address as no longer being free for allocation; and

clearing the entry in the ARP table so that so that TCP/IP commands can be routed to other conflicting devices.

13. The system of claim 12, wherein the determining step comprises checking the first IP address against a list of IP addresses of devices known to be present on the network.

14. The system of claim 12, comprising verifying that the first address is free using a network scanning mechanism.

15. The system of claim 14, wherein the network scanning mechanism comprises a ping or a portmap.

16. The system of claim 12, wherein at least one of the plurality of devices comprises a video camera.

17. The system of claim 12, wherein when the first IP address is determined to be unavailable, selecting a next IP address and determining whether the next IP address is free for allocation.

18. The system of claim 12, wherein the IP address range is a user-defined.

19. The system of claim 18, wherein the command to change the IP address of the first or second device sending comprises a TCP/IP command.

20. The system of claim 12, comprising determining whether a second targeted device exists in a list of devices to be cleared of conflicting IP addresses;

and repeating said determining, adding, correlating, sending and reclassifying steps for a second targeted device of said list of devices.

21. The system of claim 12, wherein if the first IP address is determined to be not free, determining whether a next IP address is free.

22. The system of claim 21, comprising repeating the determining step until a free address is identified.

23. A system for resolving conflicts in IP addresses for a plurality of devices on a network, the system comprising

a controller, comprising a processor, a memory, an address resolution protocol (ARP) table, a network interface, and a user interface;

the controller configured to;

identify first and second devices associated with a network as having a same IP address;

allocate a free IP address for allocation to a selected one of the first and second devices;

add an entry to the ARP table to route TCP/IP commands to the selected device;

command the selected device to change its IP address to the free IP address;

reclassify the first IP address as no longer being free for allocation; and

clearing the entry in the ARP table so that so that TCP/IP commands can be routed to other conflicting devices.