Method and system for identifying a computing device in response to a request packet

• US 7,287,090 B1
• Filed: 06/01/2001
• Issued: 10/23/2007
• Est. Priority Date: 12/21/2000
• Status: Expired due to Term

• Current Assignee: Cloudrock LLC (Slingshot Technologies LLC)
• Original Assignee: Noatak Software LLC (Intellectual Ventures LLC)
• Inventors: Berg, Mitchell T.
• Primary Examiner(s): Avellino; Joseph E.
• Application Number:
  US09/872,332
• Time in Patent Office: 2,335 Days
• Field of Search: 709236-244, 709217-219, 709227-229, 370/389, 370/392
• US Class Current: 709/238
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/101 based on network conditions
• CPC Class Codes: H04L 67/1012 based on compliance of requirements or conditions with available server resources
• CPC Class Codes: H04L 67/1014 based on the content of a request
• CPC Class Codes: H04L 67/1017 based on a round robin mechanism
• CPC Class Codes: H04L 67/1019 Random or heuristic server selection
• CPC Class Codes: H04L 67/1023 based on a hash applied to IP addresses or costs
• CPC Class Codes: H04L 67/1027 Persistence of sessions during load balancing

Abstract

According to a first embodiment, a first computing device receives a request packet originating from a client. In response to at least the request packet and a state of at least one of the first computing device and a second computing device, the first computing device selects a computing device for maintaining a session with the client. If the selected computing device is the first computing device, the first computing device outputs a response packet to the client for identifying the first computing device as maintaining the session with the client. If the selected computing device is a second computing device, the first computing device outputs a response packet to the client for identifying the second computing device as maintaining the session with the client. According to a second embodiment, a first computing device receives a request packet originating from a client. The request packet includes an identifier. In response to the request packet, the first computing device identifies a computing device that is associated with the identifier. If the identified computing device is the first computing device, the first computing device performs an operation of an application in response to the request packet. If the identified computing device is a second computing device, the first computing device outputs the request packet to the second computing device for performing the operation in response to the request packet.

Claims

1. An information processing system, comprising:

a first computing device configured to;

receive a request packet originating from a client, the request packet including an identifier;

in response to the request packet, identify a computing device that is associated with the identifier;

when the identified computing device is the first computing device, perform an operation of a first application in response to the request packet; and

when the identified computing device is a second computing device, output a second packet addressed to a forward thread address of the second computing device for performing the operation of the first application in response to the second packet, the second packet including a reference to connection with the client and a field that is set to indicate the second packet is a forwarded packet, the reference and the field being included within a single header of the second packet.

2. The system of claim 1 wherein the identifier is a session identifier.

3. The system of claim 2 wherein the session identifier is an HTTP session identifier.

4. The system of claim 1 wherein the identifier is a URL identifier.

5. The system of claim 1 wherein the identifier is an SSL identifier.

6. The system of claim 1 wherein the first computing device is configured to identify the computing device associated with the identifier by determining whether the computing device stores a data structure of the connection with the client.

7. The system of claim 1 wherein the second packet includes the request packet.

8. The system of claim 1 wherein the reference includes an IP address of the client, a port of a second application executed by the client, an IP address of the second computing device, and a port of the first application executed by the second computing device.

9. The system of claim 8 wherein the port of the application executed by the second computing device is a TCP port.

10. The system of claim 8 wherein the port of the application executed by the second computing device is a UDP port.

11. The system of claim 1 wherein the first computing device is configured to receive the request packet through a global computer network.

12. The system of claim 11 wherein the first computing device is configured to:

when the identified computing device is the second computing device, output the second information packet to the second computing device through a local area network.

13. The system of claim 1 wherein the first application is a socket-based application.

14. The system of claim 1 wherein the first computing device comprises a network interface card.

15. The system of claim 1 wherein the first and second computing devices are servers in a server farm.

16. The system of claim 1 wherein the field comprises a packet type field and is set to indicate the second packet is associated with an existing connection.

17. A method performed by a first computing device of an information processing system, the method comprising:

receiving a request packet originating from a client, the request packet including an identifier;

in response to the request packet, identifying a computing device that is associated with the identifier;

when the identified computing device is the first computing device, performing an operation of a first application in response to the request packet; and

when the identified computing device is a second computing device, outputting a second packet addressed to a forward thread address of the second computing device for performing the operation of the first application in response to the second packet, the second packet including a reference to a connection with the client and a field that is set to indicate the second packet is a forwarded packet, the reference and the field being included within a single header of the second packet.

18. The method of claim 17 wherein the identifier is a session identifier.

19. The method of claim 18 wherein the session identifier is an HTTP session identifier.

20. The method of claim 17 wherein the identifier is a URL identifier.

21. The method of claim 17 wherein the identifier is an SSL identifier.

22. The method of claim 17 wherein identifying the computing device associated with the identifier comprising determining whether the computing device stores a data structure of the connection with the client.

23. The method of claim 17 wherein the second packet includes the request packet.

24. The method of claim 17 wherein the reference includes an IP address of the client, a port of a second application executed by the client, an IP address of the second computing device, and a port of the first application executed by the second computing device.

25. The method of claim 24 wherein the port of the application executed by the second computing device is a TCP port.

26. The method of claim 24 wherein the port of the application executed by the second computing device is a UDP port.

27. The method of claim 17 wherein the method comprises receiving the request packet through a global computer network.

28. The method of claim 27 wherein the method comprises:

when the identified computing device is the second computing device, outputting the second information packet to the second computing device through a local area network.

29. The method of claim 17 wherein the first application is a socket-based application.

30. The method of claim 17 wherein the first computing device comprises a network interface card.

31. The method of claim 17 wherein the first computing device is a first destination server in a server farm and the second computing device is a second destination server in the server farm.

32. The method of claim 31 wherein the method comprises:

receiving the computing device from the client through a first network;

when the identified device is the first server, performing the operation of the first application in response to the first information packet comprises executing, by the first server, a server application associated with the received packet; and

when the identified computing device is the second server, outputting the second information packet to the second computing device comprises;

generating the second packet; and

forwarding the second packet to the second server through a second network.

33. The method of claim 17 wherein the field comprises a packet type field and is set to indicate the second packet is associated with an existing condition.

34. A computer-readable storage medium containing instructions that cause a first computing device of an information processing system to perform a method comprising:

receiving a request packet originating from a client, the request packet including an identifier;

in response to the request packet, identifying a computing device that is associated with the identifier;

when the identified computing device is the first computing device, performing an operation of an application in response to the request packet; and

when the identified computing device is a second computing device, outputting a second packet addressed to a forward thread address of the second computing device for performing the operation in response to the second packet, the second packet containing a reference to a connection with the client and a field that is set to indicate the second packet is a forwarded packet, the reference and the field being included within a single header of the second packet.

35. The computer-readable storage medium of claim 34 wherein the identifier is a session identifier.

36. The computer-readable storage medium of claim 35 wherein the session identifier is an HTTP session identifier.

37. The computer-readable storage medium of claim 34 wherein the identifier is a URL identifier.

38. The computer-readable storage medium of claim 34 wherein the identifier is an SSL identifier.

39. The computer-readable storage medium of claim 34 wherein the computer-readable storage medium is a memory of a computing device.

40. The computer-readable storage medium of claim 34 wherein the field comprises a packet type field and is set to indicate the second packet is associated with an existing connection.

41. An information processing system, comprising:

a first computing device comprising;

means for receiving a first information packet originating from a client;

means for responding to the first information packet by identifying a computing device that has a connection with the client;

means for selectively performing an operation of a server application configured to perform the operation when the identified computing device is the first computing device; and

means for selectively outputting a second information packet to a second computing device configured to output the second information packet addressed to a forward thread address of the second computing device when the identified computing device is the second computing device, wherein the second computing device is configured to perform the operation in response to the second information packet, the second information packet including a reference to the connection and a field that is set to indicate the second packet is a forwarded packet, the reference and the field being included within a single header of the second information packet.

42. The system of claim 41 wherein the second information packet includes the first information packet.

43. The system of claim 41 wherein the reference includes an IP address of the client, a port of a second application executed by the client, an IP address of the second computing device, and a port of the first application executed by the second computing device.

44. The system of claim 43 wherein the port of the first application is a TCP port.

45. The system of claim 41 wherein the means for receiving is configured to receive the first information packet through a global computer network.

46. The system of claim 41 wherein the means for selectively outputting is configured to:

when the identified computing device is a second computing device, output the second information packet to the second computing device through a local area network.

47. The system of claim 41 wherein the server application is a socket-based application.

48. The system of claim 41 wherein the first computing device comprises a network interface card.

49. The system of claim 41 wherein the first information packet is addressed by the client to the first computing device, and wherein the means for receiving is configured to receive the first information packet in response to the addressing.

50. The system of claim 41 wherein the first computing device and the second computing device are servers in a server farm.

51. The system of claim 41 wherein the field comprises a packet type field and is set to indicate the second packet is associated with an existing connection.

52. A computer-readable storage medium containing instructions to cause a first computing device to process information, by performing a method comprising:

receiving a first information packet originating from a client;

in response to the first information packet, identifying a computing device that has a connection with the client;

when the identified computing device is the first computing device, performing an operation of a server application in response to the first information packet; and

when the identified computing device is a second computing device, outputting a second information packet addressed to a forward thread address of the second computing device, wherein the second computing device is configured to perform the operation in response to the second information packet, the second information packet including a reference to the connection and a field that is set to indicate the second packet is a forwarded packet, the reference and the field being included within a single header of the second information packet.

53. The computer-readable storage medium of claim 52 wherein the second information packet includes the first information packet.

54. The computer-readable storage medium of claim 52 wherein the reference includes an IP address of the client, a port of a second application executed by the client, an IP address of the second computing device, and a port of the first application executed by the second computing device.

55. The computer-readable storage medium of claim 54 wherein the port of the first application is a TCP port.

56. The computer-readable storage medium of claim 52 wherein the computer-readable medium is a memory of a computer device.

57. The computer-readable storage medium of claim 52 wherein the first information packet is received through a global computer network.

58. The computer-readable storage medium of claim 52 wherein the application is a socket-based application.

59. The computer-readable storage medium of claim 52 wherein the first computing device comprises a network interface card.