Flow timeout control within a network

• US 10,298,694 B1
• Filed: 07/01/2014
• Issued: 05/21/2019
• Est. Priority Date: 07/01/2014
• Status: Active Grant

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Tagore, Kalyana Prakash Ravindranath
• Primary Examiner(s): Chacko, Joe
• Application Number:
  US14/321,135
• Time in Patent Office: 1,785 Days
• CPC Class Codes: H04L 63/0209 Architectural arrangements, e.g. perimeter networks or demilitarized zones
• CPC Class Codes: H04L 67/145 avoiding end of session, e.g. keep-alive, heartbeats, resumption message or wake-up for inactive or interrupted session

Abstract

In general, techniques are described for performing flow timeout control within a network. A device comprising a processor may be configured to perform the techniques. The processor may be configured to, as one example, determine, from a first packet of a packet flow, a minimum timeout value for the packet flow indicative of a time duration during which a first computing device will not send a keep-alive message to prevent the packet flow from timing out. The processor may then determine an intermediate timeout value for the packet flow based on a comparison of the minimum timeout value to a maximum timeout value, and specify the intermediate timeout value in a second packet of the packet flow sent by the second network device to the first network device in response to the first packet.

Claims

1. A method comprising:

determining, by a first computing device and for a packet flow that will include data from an instance of an application executed by the first computing device, a minimum timeout value indicative of a time duration during which the first computing device is not required to send a keep-alive message to prevent an intermediate network device positioned in a service provider network between the first computing device and a second computing device from timing out the packet flow, the first computing device operating as a client of the second computing device, the second computing device positioned in a public network to which the service provider network provides access, the packet flow is from the first computing device to the second computing device, and the intermediate network device is not configured to execute, for the packet flow, as any of a host of, client of, or proxy for any of the first computing device and the second computing device;

generating, by the first computing device, either a transport control protocol (TCP) packet of the packet flow, the packet including an option field in a header of the TCP packet specifying the minimum timeout value, or a user datagram protocol (UDP) packet of the packet flow, the UDP packet including a field in a payload of the UDP packet specifying the minimum timeout value;

transmitting, by the first computing device and via the intermediate network device, either the TCP packet or the UDP packet to an application executing on the second computing device;

receiving a packet forwarded by the intermediate network device specifying an intermediate timeout value inserted, by the intermediate network device, into a TCP packet or UDP packet forwarded by the intermediate network device; and

transmitting, based on the intermediate timeout value and the minimum timeout value, subsequent packets of the packet flow.

2. The method of claim 1, wherein transmitting the subsequent packets comprises transmitting, when the intermediate timeout value is the same as the minimum timeout value, the subsequent packets of the packet flow in accordance with the minimum timeout value.

3. The method of claim 1, wherein transmitting the subsequent packets comprises:

generating, when the intermediate timeout value is not the same as the minimum timeout value, one of the subsequent packets in response to the packet forwarded by the intermediate network device specifying the intermediate timeout value in place of the minimum timeout value; and

transmitting the remaining ones of the subsequent packets of the packet flow in accordance with the intermediate timeout value.

4. The method of claim 1,

wherein the application comprises a first application,

wherein the minimum timeout value comprises a first minimum timeout value,

wherein the packet flow comprises a first packet flow, and

wherein the method further comprises:

determining, by the first computing device and for a second packet flow that will include data from an instance of a second application executed by the first computing device, a second minimum timeout value indicative of a time duration during which the first computing device is not required to send a keep-alive message to prevent an intermediate network device positioned between the first computing device and a second computing device from timing out the second packet flow, wherein the second minimum timeout value is different than the first minimum timeout value;

generating, by the first computing device, a packet of the second packet flow such that the packet from the second packet flow includes a request to the intermediate network device that the second packet flow be assigned the second minimum timeout value; and

transmitting the packet of the second packet flow to an application executing on a third computing device.

5. The method of claim 1, further comprising issuing, with the instance of the application executing on the first computing device, a kernel call to an operating system of the first computing device to register the instance of the application with the operating system and specify the minimum timeout value to be used with packet flows originated by the operating system for the instance of the application.

6. The method of claim 1,

wherein the first computing device comprises a mobile endpoint device,

wherein the service provider network comprises a wireless access network and a core network,

wherein the mobile endpoint device interfaces with the wireless access network via a wireless connection, and

wherein the intermediate network device comprises a mobile gateway positioned intermediately in the core network.

7. A first computing device comprising:

one or more processors operably coupled to a memory, and configured to;

determine, for a packet flow that will include data from an instance of an application executed by the first computing device, a minimum timeout value indicative of a time duration during which the first computing device is not required to send a keep-alive message to prevent an intermediate network device positioned in a service provider network between the first computing device and a second computing device from timing out the packet flow, the first computing device operating as a client of the second computing device, the second computing device positioned in a public network to which the service provider network provides access, the packet flow is from the first computing device to the second computing device, and the intermediate network device is not configured to execute, for the packet flow, as any of a host of, client of, or proxy for any of the first computing device and the second computing device; and

generate either a transport control protocol (TCP) packet of the packet flow, the packet including an option field in a header of the TCP packet specifying the minimum timeout value, or a user datagram protocol (UDP) packet of the packet flow, the UDP packet including a field in a payload of the UDP packet specifying the minimum timeout value; and

a network interface configured to;

transmit, via the intermediate network device, either the TCP packet or the UDP packet to an application configured to be executed by the second computing device;

receive a packet forwarded by the intermediate network device specifying an intermediate timeout value inserted, by the intermediate network device, into the TCP packet or the UDP packet forwarded by the intermediate network device; and

transmit, based on the intermediate timeout value and the minimum timeout value, subsequent packets of the packet flow.

8. A method comprising:

determining, from a first packet of a packet flow that includes data from an instance of an application executed by a first computing device, a minimum timeout value for the packet flow indicative of a time duration during which the first computing device will not send a keep-alive message to prevent the packet flow from timing out, wherein the first packet comprises either a transport control protocol (TCP) packet including a header having an option field specifying the minimum timeout value or a user datagram protocol (UDP) packet including a field in a payload of the UDP packet specifying the minimum timeout value;

determining an intermediate timeout value for the packet flow based on a comparison of the minimum timeout value to a maximum timeout value, the maximum timeout value configured for use by an intermediate network device intermediately positioned in a service provider network between the first computing device and a second computing device and indicative of a maximum time duration that any given packet flow is to remain active within the intermediate network device before being timed out, the first computing device operating as a client of the second computing device, the second computing device positioned in a public network to which the service provider network provides access, the packet flow is from the first computing device to the second computing device, and the intermediate network device is not configured to execute, for the packet flow, as any of a host of, client of, or proxy for any of the first computing device and the second computing device; and

specifying the intermediate timeout value in a second packet of the packet flow sent by the second computing device to the first computing device in response to the first packet.

9. The method of claim 8,

wherein determining the minimum timeout value comprises determining the minimum timeout value from the optional field in the header of the TCP packet.

10. The method of claim 8,

wherein determining the minimum timeout value comprises determining the minimum timeout value from the field in the payload of the UDP packet.

11. The method of claim 8, wherein determining the intermediate timeout value comprises determining the intermediate timeout value to be equal to the minimum timeout value when the minimum timeout value is less than or equal to the maximum timeout value.

12. The method of claim 8, wherein determining the intermediate timeout value comprises determining the intermediate timeout value to be equal to the maximum timeout value when the minimum timeout value is greater than the maximum timeout value.

13. The method of claim 12, further comprising receiving a third packet from the first computing device specifying the intermediate timeout value to acknowledge that the first computing device has accepted the intermediate timeout value having a value less than the minimum timeout value.

14. The method of claim 8,

wherein the intermediate timeout value comprises a first intermediate timeout value,

wherein the second packet includes an second intermediate timeout value specified by a different intermediate network device that is also intermediately positioned between the first computing device and the second computing device, and

wherein determining the intermediate timeout value comprising determining the first intermediate timeout value to be equal to, when the second intermediate timeout value is less than both the minimum timeout value and the first intermediate timeout value, the second intermediate timeout value.

15. The method of claim 8,

wherein the first computing device comprises a mobile endpoint device,

wherein the service provider network comprises a wireless access network and a core network,

wherein the mobile endpoint device interfaces with the wireless access network via a wireless connection, and

wherein the intermediate network device comprises a mobile gateway positioned intermediately in the core network.

16. An intermediate network device comprising:

one or more processors operably coupled to a memory, configured to;

determine, from a first packet of a packet flow that includes data from an instance of an application executed by a first computing device, a minimum timeout value for the packet flow indicative of a time duration during which the first computing device will not send a keep-alive message to prevent the packet flow from timing out, wherein the first packet comprises either a transport control protocol (TCP) packet including a header having an option field specifying the minimum timeout value or a user datagram protocol (UDP) packet including a field in a payload of the UDP packet specifying the minimum timeout value;

determine an intermediate timeout value for the packet flow based on a comparison of the minimum timeout value to a maximum timeout value, the maximum timeout value configured for use by the intermediate network device intermediately positioned in a service provider network between the first computing device and a second computing device and indicative of a maximum time duration that any given packet flow is to remain active within the intermediate network device before being timed out, the first computing device operating as a client of the second computing device, the second computing device positioned in a public network to which the service provider network provides access, the packet flow is from the first computing device to the second computing device, and the intermediate network device is not configured to execute, for the packet flow, as any of a host of, client of, or proxy for any of the first computing device and the second computing device; and

specify the intermediate timeout value in a second packet of the packet flow sent by the second network device to the first network device in response to the first packet.

17. The intermediate network device of claim 16, wherein the control unit is configured to determine the intermediate timeout value to be equal to the minimum timeout value when the minimum timeout value is less than or equal to the maximum timeout value.

18. The intermediate network device of claim 16, wherein the control unit is configured to determine the intermediate timeout value to be equal to the maximum timeout value when the minimum timeout value is greater than the maximum timeout value.

19. The intermediate network device of claim 18, further comprising an interface configured to receive a third packet from the first computing device specifying the intermediate timeout value to acknowledge that the first computing device has accepted the intermediate timeout value having a value less than the minimum timeout value.

20. The intermediate network device of claim 16,

wherein the intermediate timeout value comprises a first intermediate timeout value,

wherein the second packet includes an second intermediate timeout value specified by a different intermediate network device that is also intermediately positioned between the first computing device and the second computing device, and

wherein the control unit is configured to determine the first intermediate timeout value to be equal to, when the second intermediate timeout value is less than both the minimum timeout value and the first intermediate timeout value, the second intermediate timeout value.