Methods, communication networks, and computer program products for monitoring, examining, and/or blocking traffic associated with a network element based on whether the network element can be trusted

• US 8,977,745 B2
• Filed: 02/18/2013
• Issued: 03/10/2015
• Est. Priority Date: 12/22/2005
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Aaron, Jeffrey A., Shrum, Edgar Vaughan Jr.
• Primary Examiner(s): Keehn, Richard G
• Application Number:
  US13/769,693
• Publication Number:
  US 20130160118A1
• Time in Patent Office: 750 Days
• Field of Search: 709/224
• US Class Current: 709/224
• CPC Class Codes: H04L 63/0263 Rule management
• CPC Class Codes: H04L 63/1408 by monitoring network traffic monitoring network traffic per se H04L43/00
• CPC Class Codes: H04L 63/1441 Countermeasures against malicious traffic countermeasures against attacks on cryptographic mechanisms H04L9/002
• CPC Class Codes: H04L 67/1057 involving pre-assessment of levels of reputation of peers

Abstract

A communication network is operated by determining whether a network element can be trusted and monitoring traffic associated with the network element based on whether the network element can be trusted. At least some of the monitored traffic may be selected for examination based on the degree of trust for the network element. At least some of the monitored and/or examined traffic is selected to be blocked based on the degree of trust for the network element.

Claims

1. A method of operating a communication network, comprising:

determining whether a network element can be trusted, wherein determining whether a network element can be trusted comprises;

generating a first hash value based on data associated with the network element wherein the first hash value is based on a configuration of the network element at a first time and the first hash value is an acceptable result for the configuration of the network element;

generating a second hash value based on the data associated with the network element wherein the second hash value is based on a configuration of the network element at a second time different than the first time;

comparing the first hash value with the second hash value to determine whether the network element can be trusted based on whether a change has occurred in the configuration of the network between the first time and the second time;

monitoring traffic associated with the network element based on whether the network element can be trusted; and

selecting some of the traffic that was monitored to be blocked based on the degree of trust for the network element;

wherein monitoring traffic comprises;

monitoring the traffic using rules to determine if the traffic contains unexpected information based on the degree of trust for the network element;

providing results with respect to whether the traffic contains unexpected information to a human expert interface based on the degree of trust for the network element;

selecting traffic for monitoring using rules that are based on network element trust information; and

selecting some of the traffic that was monitored for examination based on a degree of trust for the network element;

wherein monitoring traffic further comprises;

specifying the traffic to be monitored based on traffic classification;

examining the traffic that was monitored and was selected using rules using a level of examination selected from a plurality of levels of examination to determine whether the traffic contains unexpected information based on the degree of trust for the network element; and

providing results with respect to whether the traffic that was monitored and was selected using rules contains unexpected information to the human expert interface based on the degree of trust for the network element;

wherein the level of examination of the traffic that was monitored and was selected using rules is based on the degree of trust for the network element.

2. The method of claim 1, wherein comparing the first hash value with the second hash value to determine whether the network element can be trusted comprises comparing the first hash value with the second hash value to determine a degree of trust for the network element.

3. The method of claim 1, wherein monitoring traffic further comprises:

specifying the traffic to be monitored based on one of a time duration and a traffic amount.

4. The method of claim 1, wherein monitoring the traffic further comprises:

obtaining input via the human expert interface; and

revising the results with respect to whether the traffic contains unexpected information based on the input.

5. The method of claim 1, further comprising:

examining the some of the traffic that was monitored using one of rules, pattern matching techniques, and deviation from expected values techniques to determine if the traffic contains unexpected information based on the degree of trust for the network element.

6. The method of claim 5, wherein examining the some of the traffic that was monitored comprises:

obtaining input via the human expert interface; and

revising the results with respect to whether the some of the traffic that was monitored contains unexpected information based on the input.

7. The method of claim 1, further comprising:

blocking the some of the traffic to be blocked using filtering based on one of source address, destination address, port, protocol, and state of a connection.

8. The method of claim 7, wherein blocking the some of the traffic to be blocked comprises:

obtaining input via the human expert interface; and

permanently blocking the some of the traffic to be blocked based on the input.

9. The method of claim 1, further comprising:

modifying rules, pattern matching techniques, and deviation from expected values techniques used in monitoring the traffic and examining the some of the traffic.

10. A method according to claim 1 wherein the network element is a communications device comprising one of a router, a gateway, a switching device, a cable modem, a digital subscriber line modem, a public switched telephone network modem, a wireless local area network modem, a wireless wide area network modem, a computer with a modem, a mobile terminal with a modem, a personal data assistant with a modem, and a cellular telephone with a modem.

11. A system, comprising:

a processor; and

a memory coupled to the processor and comprising computer readable program code embodied in the memory that when executed by the processor causes the processor to perform operations comprising;

generating a first hash value based on data associated with the network element wherein the first hash value is based on a configuration of the network element at a first time and the first hash value is an acceptable result for the configuration of the network element;

generating a second hash value based on the data associated with the network element wherein the second hash value is based on a configuration of the network element at a second time different than the first time;

comparing the first hash value with the second hash value to determine whether the network element can be trusted based on whether a change has occurred in the configuration of the network between the first time and the second time;

monitoring traffic associated with the network element based on whether the network element can be trusted; and

selecting some of the traffic that was monitored to be blocked based on the degree of trust for the network element;

wherein monitoring traffic comprises;

monitoring the traffic using rules to determine if the traffic contains unexpected information based on the degree of trust for the network element;

providing results with respect to whether the traffic contains unexpected information to a human expert interface based on the degree of trust for the network element;

selecting traffic for monitoring using rules that are based on network element trust information; and

selecting some of the traffic that was monitored for examination based on a degree of trust for the network element;

wherein monitoring traffic further comprises;

specifying the traffic to be monitored based on traffic classification;

examining the traffic that was monitored and was selected using rules using a level of examination selected from a plurality of levels of examination to determine whether the traffic contains unexpected information based on the degree of trust for the network element; and

providing results with respect to whether the traffic that was monitored and was selected using rules contains unexpected information to the human expert interface based on the degree of trust for the network element;

wherein the level of examination of the traffic that was monitored and was selected using rules is based on the degree of trust for the network element.

12. The system of claim 11, wherein comparing the first hash value with the second hash value to determine whether the network element can be trusted comprises comparing the first hash value with the second hash value to determine a degree of trust for the network element.

13. The system of claim 11, wherein monitoring traffic further comprises:

specifying the traffic to be monitored based on one of a time duration and a traffic amount.

14. The system of claim 11, wherein monitoring the traffic further comprises:

obtaining input via the human expert interface; and

revising the results with respect to whether the traffic contains unexpected information based on the input.

15. The system of claim 11, wherein the operations further comprise:

examining the some of the traffic that was monitored using one of rules, pattern matching techniques, and deviation from expected values techniques to determine if the traffic contains unexpected information based on the degree of trust for the network element.