Method for IP address discovery in rapidly changing network environment

• US 7,523,197 B2
• Filed: 03/09/2006
• Issued: 04/21/2009
• Est. Priority Date: 03/09/2006
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Sielken, Robert Selby, Griffin, David Lee, Momenee, Karen Neidlinger, Woodward, Steven Gary, Nassiff, Amado, Wimer, William Carleton II, Martinez, Christopher James, Celi, Joseph Jr., Castaneda, Frank J.
• Primary Examiner(s): Entienne; Ario
• Assistant Examiner(s): RUBIN, BLAKE J
• Application Number:
  US11/371,783
• Publication Number:
  US 20070214256A1
• Time in Patent Office: 1,139 Days
• Field of Search: None
• US Class Current: 709/224
• CPC Class Codes: H04L 67/025 for remote control or remote monitoring of applications
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066

Abstract

A method for Internet protocol (IP) address discovery in a rapidly changing network environment is presented. A server and a client use an adaptive discovery polling process to determine an optimum heartbeat interval that minimizes network traffic and allows the server to monitor the client'"'"'s source address. The client and server exchange discovery poll messages and heartbeat messages at varying time intervals in order to identify a computer network'"'"'s timeout period or a network address translator'"'"'s message block timeout period. Once the timeout period is identified, the client sends heartbeat messages to the server at an “optimum heartbeat interval” that is less than the identified timeout period in order to maintain the network connection. As a result, the server is able to send messages to the client without delay.

Claims

1. A computer-implemented method comprising:

receiving, at a server, a registration request from a client;

identifying a source address included in the registration request that corresponds to the client;

extracting a protocol layer address from the registration request that is included in the registration request'"'"'s protocol layer information;

comparing the source address with the protocol layer address;

determining whether a network address translator is included in the network connection between the server and the client based upon comparing the source address with the protocol layer address;

providing a discovery poll interval to the client in response to receiving the registration request, the discovery poll interval associated with a time that messages are sent between the server and the client in order to maintain a network connection on a computer network between the server and the client;

detecting, after the providing, that the discovery poll interval should be adjusted;

adjusting the discovery poll interval in response to the detecting, the adjusting comprising steps of;

in response to determining that the network address translator is not included in the network connection between the server and the client, the method further comprises steps of;

receiving a heartbeat message from the client at the server;

determining, at the server, that a heartbeat source address included in the heartbeat message is different than the source address included in the registration request; and

decrementing the discovery poll interval in response to determining that the heartbeat source address is different than the source address included in the registration request;

providing the adjusted discovery poll interval to the client;

determining that the adjusted discovery poll interval minimizes the amount of the messages that are sent between the server and the client while maintaining the network connection, the determining resulting in an optimum heartbeat interval; and

in response to determining that the adjusted discovery poll interval minimizes the amount of the messages that are sent between the server and the client while maintaining the network connection, receiving the heartbeat message from the client at the server at the optimum heartbeat interval.

2. The method of claim 1 further comprising:

in response to determining that the network address translator or firewall is included in the network connection between the server and the client, the adjusting results in incrementing the discovery poll interval in response to determining that the client received the discovery poll interval.

3. The method of claim 1 wherein, in response to determining that the network address translator is included in the network connection between the server and the client, decrementing the discovery poll interval in response to determining that the client did not receive the discovery poll interval.

4. The method of claim 1 further comprising:

detecting a different client that is included on the network;

identifying a different discovery poll interval corresponding to the different client; and

using the different discovery poll interval during the adjusting of the discovery poll interval.

5. The method of claim 1 further comprising:

after determining the optimum heartbeat interval, modifying the optimum heartbeat interval in response to detecting a change in the source address.

6. The method of claim 5 wherein the modifying further comprises:

repeating the providing of the discovery poll interval to the client, the detecting, the adjusting, the providing of the adjusted poll interval, the determining, and the receiving.