Revealing occurrence of network address translations

• US 8,914,872 B2
• Filed: 08/26/2013
• Issued: 12/16/2014
• Est. Priority Date: 06/15/1999
• Status: Expired due to Fees

• Current Assignee: SSH Communications Security Oyj
• Original Assignee: SSH Communications Security Oyj
• Inventors: Kivinen, Tero, Ylonen, Tatu
• Primary Examiner(s): Cervetti, David Garcia
• Application Number:
  US13/975,492
• Publication Number:
  US 20130339524A1
• Time in Patent Office: 477 Days
• Field of Search: 726/14
• US Class Current: 726/14
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 2101/663 Transport layer addresses, e.g. aspects of transmission control protocol [TCP] or user datagram protocol [UDP] ports
• CPC Class Codes: H04L 45/026 Details of "hello" or keep-alive messages
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/25 of the same type
• CPC Class Codes: H04L 61/2514 between local and global IP addresses
• CPC Class Codes: H04L 61/2553 Binding renewal aspects, e.g. using keep-alive messages
• CPC Class Codes: H04L 61/256 NAT traversal
• CPC Class Codes: H04L 61/2564 for a higher-layer protocol, e.g. for session initiation protocol [SIP]
• CPC Class Codes: H04L 61/2575 using address mapping retrieval, e.g. simple traversal of user datagram protocol through session traversal utilities for NAT [STUN]
• CPC Class Codes: H04L 61/2578 without involvement of the NAT server
• CPC Class Codes: H04L 61/5007 Internet protocol [IP] addresses
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/029 Firewall traversal, e.g. tunnelling or, creating pinholes
• CPC Class Codes: H04L 63/04 for providing a confidential data exchange among entities communicating through data packet networks
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/165 : Combined use of TCP and UDP protocols; selection criteria therefor

Abstract

A method, apparatus, and computer-readable media are presented that provide a configuration for revealing occurrence of network address translation by receiving a packet that includes an encoding of a source port number and then determining whether a network address translation occurred on the packet by comparing the source port number against a predetermined port number.

Claims

1. An apparatus comprising at least one processor, and at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processor, cause the apparatus to:

receive a packet comprising an encoding of a source port number; and

determine whether a network address translation occurred on the packet by comparing the source port number against a predetermined port number.

2. The apparatus of claim 1, wherein the apparatus is configured to determine an occurred network address translation when the comparing indicates that the source port number is different from the predefined source port number.

3. The apparatus of claim 1, wherein the apparatus is configured to compare a source port number in a header of the packet against a standard source port number.

4. The apparatus of claim 1, wherein the predetermined source port number comprises a standard Internet Key Exchange (IKE) port number.

5. The apparatus of claim 1, wherein the predetermined source port number is 500.

6. A method comprising:

receiving, by a computer device, a packet comprising an encoding of a source port number; and

determining whether a network address translation occurred on the packet by comparing the source port number against a predetermined port number.

7. The method of claim 6, wherein the determining comprises determining an occurred network address translation when the comparing indicates that the source port number is different from the predefined source port number.

8. The method of claim 6, wherein the determining comprises comparing a source port number in a header of the packet against a standard source port number.

9. The method of claim 6, wherein the predetermined source port number comprises a standard Internet Key Exchange (IKE) port number.

10. The method of claim 6, wherein the predetermined source port number is 500.

11. A non-transitory computer readable media for revealing occurrence of network address translations, comprising program code for causing a processor to perform instructions for

receiving a packet comprising an encoding of a source port number;

and

determining whether a network address translation occurred on the packet by comparing the source port number against a predetermined port number.

12. The non-transitory computer readable media of claim 11, wherein the determining comprises determining an occurred network address translation when the comparing indicates that the source port number is different from the predefined source port number.

13. The non-transitory computer readable media of claim 11, wherein the determining comprises comparing a source port number in a header of the packet against a standard source port number.

14. The non-transitory computer readable media of claim 11, wherein the predetermined source port number comprises a standard Internet Key Exchange (IKE) port number.

15. The non-transitory computer readable media of claim 11, wherein the predetermined source port number is 500.