Method and apparatus for providing security in an intranet network

• US 9,699,143 B2
• Filed: 06/01/2015
• Issued: 07/04/2017
• Est. Priority Date: 08/07/2008
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Dargis, Anthony
• Primary Examiner(s): Siddiqi, Mohammad A
• Application Number:
  US14/727,457
• Publication Number:
  US 20150264013A1
• Time in Patent Office: 764 Days
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 63/101 Access control lists [ACL]
• CPC Class Codes: H04L 63/1458 Denial of Service
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 63/20 for managing network security; network security policies in general filtering policies H04L63/0227

Abstract

A method and an apparatus for providing security in an intranet network are disclosed. For example, the method receives a packet at a customer edge router, and applies an inbound access control list by the customer edge router to the packet if the packet is destined to a server in a protected server group, wherein said protected server group identifies one or more servers within the intranet network to be protected. The method applies an outbound access control list by the customer edge router to the packet if the packet is from a server in the protected server group.

Claims

1. A method for providing security in a virtual private network, the method comprising:

defining, by a processor of a customer edge router, a protected server group, wherein the protected server group identifies a subset of all customer endpoint devices in the virtual private network, wherein the subset includes a server within the virtual private network to be protected;

receiving, by the processor, a packet; and

applying, by the processor, an outbound access control list to the packet when the packet is from a server in the protected server group, wherein the outbound access control list comprises an outbound list of internet protocol addresses that the protected server group is allowed to initiate a session with, wherein the applying the outbound access control list comprises;

determining that the packet is from the server in the protected server group and that the packet is sent without being solicited; and

blocking a transmission of the packet that is sent without being solicited.

2. The method of claim 1, further comprising:

allowing the packet to proceed towards its destination when the packet is not to or from the server in the protected server group.

3. The method of claim 1, further comprising:

determining whether the server in the protected server group has been compromised by monitoring a request from the server for creating a session.

4. The method of claim 1, further comprising:

detecting a denial of service attack by monitoring a number of half open sessions from a customer endpoint device to the server in the protected server group.

5. The method of claim 1, wherein the packet is for a stateless session.

6. The method of claim 1, wherein the packet is for a user datagram protocol session.

7. The method of claim 1, wherein the packet is for an internet control message protocol session.

8. A tangible non-transitory computer-readable medium storing a plurality of instructions which, when executed by a processor of a customer edge router, cause the processor to perform operations for providing security in a virtual private network, the operations comprising:

defining a protected server group, wherein the protected server group identifies a subset of all customer endpoint devices in the virtual private network, wherein the subset includes a server within the virtual private network to be protected;

receiving a packet; and

applying an outbound access control list to the packet when the packet is from a server in the protected server group, wherein the outbound access control list comprises an outbound list of Internet protocol addresses that the protected server group is allowed to initiate a session with, wherein the applying the outbound access control list comprises;

determining that the packet is from the server in the protected server group and that the packet is sent without being solicited; and

blocking a transmission of the packet that is sent without being solicited.

9. The non-transitory computer-readable medium of claim 8, further comprising:

allowing the packet to proceed towards its destination when the packet is not to or from the server in the protected server group.

10. The non-transitory computer-readable medium of claim 8, further comprising:

determining whether the server in the protected server group has been compromised by monitoring a request from the server for creating a session.

11. The non-transitory computer-readable medium of claim 8, further comprising:

detecting a denial of service attack by monitoring a number of half open sessions from a customer endpoint device to the server in the protected server group.

12. The non-transitory computer-readable medium of claim 8, wherein the packet is for a stateless session.

13. The non-transitory computer-readable medium of claim 8, wherein the packet is for a user datagram protocol session.

14. The non-transitory computer-readable medium of claim 8, wherein the packet is for an internet control message protocol session.

15. An apparatus for providing security in a virtual private network, the apparatus comprising:

a processor of a customer edge router; and

a non-transitory computer-readable medium storing a plurality of instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising;

defining a protected server group, wherein the protected server group identifies a subset of all customer endpoint devices in the virtual private network, wherein the subset includes a server within the virtual private network to be protected;

receiving a packet; and

applying an outbound access control list to the packet when the packet is from a server in the protected server group, wherein the outbound access control list comprises an outbound list of internet protocol addresses that the protected server group is allowed to initiate a session with, wherein the applying the outbound access control list comprises;

determining that the packet is from the server in the protected server group and that the packet is sent without being solicited; and

blocking a transmission of the packet that is sent without being solicited.

16. The apparatus of claim 15, wherein the operations further comprise:

allowing the packet to proceed towards its destination when the packet is not to or from the server in the protected server group.

17. The apparatus of claim 15, wherein the operations further comprise:

determining whether the server in the protected server group has been compromised by monitoring a request from the server for creating a session.

18. The apparatus of claim 15, wherein the operations further comprise:

detecting a denial of service attack by monitoring a number of half open sessions from a customer endpoint device to the server in the protected server group.

19. The apparatus of claim 15, wherein the packet is for a stateless session.

20. The apparatus of claim 15, wherein the packet is for a user datagram protocol session or an internet control message protocol session.