Method and apparatus for managing keepalive transmissions

• US 7,526,556 B2
• Filed: 06/26/2003
• Issued: 04/28/2009
• Est. Priority Date: 06/26/2003
• Status: Expired due to Fees

• Current Assignee: AirBNB Incorporated
• Original Assignee: International Business Machines Corporation
• Inventors: Vallabhaneni, Vasu, Banerjee, Dwip N., Venkatsubra, Venkat, Jain, Vinit
• Primary Examiner(s): Hoang; Hieu T
• Application Number:
  US10/607,460
• Publication Number:
  US 20040264381A1
• Time in Patent Office: 2,133 Days
• Field of Search: 709227-229, 709223-224, 709/230
• US Class Current: 709/227
• CPC Class Codes: H04L 69/14 Multichannel or multilink protocols
• 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 69/163 In-band adaptation of TCP data exchange; In-band control procedures

Abstract

A method, apparatus, and computer instructions for managing keepalive transmissions. A keepalive packet is received from a remote data processing over a particular connection within a set of connections to the remote data processing system. Timers for each of the set of connections are reset in response to receiving a response to a keepalive packet from the remote data processing system such that only a single keepalive packet is required to maintain all of the plurality of connections with the remote data processing system. In this manner, the number of requests and responses with respect to whether a connection is active is minimized, reducing congestion in a network data processing system.

Claims

1. A method in a server data processing system for managing keepalive transmissions using a plurality of keepalive timers, wherein the server data processing system has a plurality of connections to a client data processing system, the method comprising:

responsive to expiration of one of the plurality of keepalive timers, sending a keepalive packet to the client data processing system over a particular connection within the plurality of connections to the client data processing system, wherein the keepalive packet pertains to keeping alive the particular connection within the plurality of connections; and

responsive to receiving a selected response to the keepalive packet from the client data processing system, resetting the plurality of keepalive timers within the server data processing system, with each one of the plurality of keepalive timers being associated with a respective given one of the plurality of connections, wherein transmissions of keepalive packets are reduced to both the keepalive packet and the selected response, wherein the selected response keeps alive each of the plurality of connections to the client data processing system by the resetting of the plurality of keepalive timers, and wherein the plurality of keepalive timers that are reset responsive to the receiving of the selected response are identified by the server data processing system based upon an internet protocol (IP) address used during initial establishment of the particular connection between the server data processing system and the client data processing system.

2. The method of claim 1 further comprising:

responsive to receiving data over any of the plurality of connections, resetting timers for each of the plurality of connections.

3. The method of claim 1 further comprising:

responsive to receiving a reset message over the particular connection, terminating all of the plurality of connections.

4. The method of claim 1 further comprising:

responsive to receiving a reset message over the particular connection, only terminating the particular connection.

5. The method of claim 1, wherein the selected response is an acknowledgement of the keepalive packet.

6. The method of claim 1 further comprising:

responsive to receiving a message unassociated with the keepalive packet, resetting the timers for each of the plurality of connections.

7. The method of claim 1, wherein the method is implemented in a transport layer of a TCP/IP stack.

8. The method of claim 1, wherein the particular connection is selected using a policy, wherein the policy selects the particular connection using a round robin mechanism.