Network fault isolation

• US 7,305,466 B1
• Filed: 04/19/2000
• Issued: 12/04/2007
• Est. Priority Date: 05/28/1999
• Status: Expired due to Fees

• Current Assignee: Teradyne Incorporated
• Original Assignee: Teradyne Incorporated
• Inventors: Rosen, Joseph S., Kaffine, David M., Mellor, Arthur, Schmidt, Peter H., Wolf, Jonathan
• Primary Examiner(s): Pollack; Melvin H.
• Application Number:
  US09/553,447
• Time in Patent Office: 2,785 Days
• Field of Search: 709/223, 709/224, 709/201, 709/202, 709/236, 709/237, 703/13, 703/21, 703/22, 703/24, 714/25, 714/37, 714/38, 714/4, 714/28
• US Class Current: 709/224
• CPC Class Codes: H04L 41/0631 using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
• CPC Class Codes: H04L 41/0659 by isolating or reconfiguring faulty entities
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04Q 3/0075 Fault management techniques

Abstract

Techniques are provided for improved fault isolation and fault reduction. A system for use with a data network includes multiple diagnostic units each adapted to communicate with the network including to a network user. A central controller is operatively connected to the diagnostic units, the controller being adapted to communicate with and coordinate operations of the diagnostic units, to instruct the diagnostic units to perform tests adapted to help isolate a network fault, and to analyze test results received from a diagnostic unit to attempt to determine the network fault. Various methods for improving fault isolation and fault reduction are also provided.

Claims

1. A method of diagnosing a problem in a network impacting communication between a network user and a destination machine in the data network comprising:

establishing communication between a diagnostic unit and the network user using a protocol stack adapted to establish communication with the network user even if the network user is attempting to communicate using a protocol or configuration that is inconsistent with a protocol or configuration of the destination machine;

simulating, with said diagnostic unit, the destination machine to said network user by receiving first data from the network user, generating second data simulating a response of the destination machine to the first data and sending the second data to the network user;

determining with said diagnostic unit the presence of a problem with said network user based at least in part on information gathered during the act of simulating; and

if a problem is determined, storing an indicator of the problem on a computer-readable medium,

wherein said diagnostic unit is located remotely to said network user and said destination machine.

2. The method of claim 1 wherein determining the presence of a problem with said network user includes determining a problem while there is a problem impacting communication between the diagnostic unit and the destination machine.

3. The method of claim 1 wherein establishing communication between a diagnostic unit and the network user includes establishing communication while the network user is misconfigured for communication through the network.

4. The method of claim 1 wherein emulating further comprises acquiring a user identification of said network user.

5. The method of claim 1 further comprising introducing test data to said network user.

6. The method of claim 4 wherein acquiring a user identification includes authenticating a password of said network user.

7. The method of claim 5 further comprising monitoring the results of said test data introduced to said network user.

15. The method of claim 1 wherein establishing communication between a diagnostic unit and a network user includes the network user calling a help desk maintained by the network operator.

8. A method of diagnosing a problem in a network impacting communication between a network user and a destination machine in the data network comprising:

establishing communication between a diagnostic unit and the destination machine protocol, and between said diagnostic unit and said network user;

simulating, with said diagnostic unit, said network user to said destination machine by generating first data simulating the network user, sending the first data to the destination machine and receiving second data from the destination machine;

determining with said diagnostic unit the presence of a problem within said data network based at least in part on information gathered during the act of simulating; and

if a problem is determined, communicating an indicator of the problem,

wherein said diagnostic unit is located remotely to said network user and said destination machine.

9. The method of claim 8 wherein said determining the presence of a problem within said data network is determined includes determining the presence of a problem within said data network despite the presence of problem impacting communication with the network user.

10. The method of claim 8 wherein determining the presence of a problem within said data network is performed while the network user is misconfigured for communication through the network.

11. The method of claim 8 wherein emulating further comprises said diagnostic unit providing a user identification for said network user.

12. The method of claim 8 further comprising said diagnostic unit injecting test data into said data network.

13. The method of claim 11 wherein acquiring a user identification includes providing a password for said network user.

14. The method of claim 12 further comprising monitoring with said diagnostic unit the results of said test data injected into said data network.

16. A method of diagnosing a problem in a network impacting communication between a network user and a destination machine in the data network comprising:

a) checking for the presence of a problem with a user device by;

i) establishing communication between a diagnostic unit and the user device;

ii) simulating, with said diagnostic unit, the destination machine to said user device by receiving first data from the user device, generating second data simulating a response of the destination machine to the first data, and sending the second data to the network user;

iii) using the diagnostic unit to observe communications from the user device during the act of simulating the destination machine;

iv) using the communications from the user device to determine whether there is a problem with the network in a portion of the network from the diagnostic unit toward the user device; and

v) if a problem is determined, communicating an indicator of the problem;

b) checking for a problem with the network excluding the user device by;

i) establishing communication between a diagnostic unit and the destination machine;

ii) simulating, with said diagnostic unit, said user device to said destination machine by generating third data simulating the user device, sending the third data to the destination machine and receiving fourth data from the destination machine;

iii) using the diagnostic unit to observe communications from the destination machine during the act of simulating said user device;

iv) using the communications from the destination machine to determine whether there is a problem with said data network, in a portion of the network from the diagnostic unit toward the destination machine; and

v) if a problem is determined , storing an indicator of the problem on a computer-readable medium,

wherein said diagnostic unit is located remotely to said network user and said destination machine.

17. The method of claim 16 wherein establishing communication between a diagnostic unit and the user devices includes the user calling a help desk operated by the network service provider.

18. The method of claim 16 wherein establishing communication between a diagnostic unit and the user devices includes negotiating a link control protocol between the diagnostic unit and a user device.

19. The method of claim 16 wherein establishing communication between a diagnostic unit and the user devices includes providing a diagnostic unit that can respond to a user device configured for static IP addressing or dynamic IP addressing.

20. The method of claim 19 wherein determining whether there is a problem with said network user devices includes detecting a misconfigured user device based on the type of IP addressing used to establish communication between the diagnostic unit and the user device.