Data packet retransmission processing

Patent metadata

Field	Value
Publication number	US-2016308764-A1
Application number	US-201514749746-A
Country	US
Kind code	A1
Filing date	Jun 25, 2015
Priority date	Apr 17, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

Methods for performing retransmission of data packets over a network. A node receives a data packet with a source and a destination address. The data packet is sent along a network path to the destination address, and information associated with the data packet is sent to a controller node that is independent of the network path. A controller receives information associated with a data packet from any forwarder node within a plurality of forwarder nodes each monitoring communications along separate communications paths. An indication of a receipt acknowledgement for the data packet is received from a second forwarder node that is separate from the first forwarder node and the controller node. The receipt acknowledgement is correlated with the data packet and based on the correlating, data associated with retransmission processing of the data packet is deleted.

First claim

What is claimed is:

1 . A method comprising:
receiving, at a network node, a data packet with a source address and a destination address, the network node being separate from a source node with the source address and separate from a destination node with the destination address; sending the data packet along a network path to the destination node; identifying a data packet type of the data packet; and sending, based on a determination that the data packet type is within a set of determined data packet types, information associated with the data packet to a controller node, the controller node being independent of the network path.

2 . The method of claim 1 , wherein the information associated with the data packet comprises at least a portion of the data packet.

3 . The method of claim 1 , further comprising:
storing at least a portion of the data packet into a data storage; deleting, based on receiving an indication to delete the data packet, the at least the portion of the data packet from the data storage; and resending, based on a retransmission instruction from the controller, the at least the portion of the data packet to the destination.

4 . The method of claim 3 , further comprising receiving a message from the controller comprising at least one of the indication to delete the data packet and the retransmission instruction.

5 . The method of claim 1 , wherein identifying the data packet type comprising determining a characteristic of the data packet, the characteristic comprising at least one of a subnet of an address within the data packet, a TCP port number of the data packet, and a flow direction of the data packet and wherein the data packet type is based on the characteristic.

6 . The method of claim 1 , further comprising defining, based on the data packet type, the information associated with the data packet to comprise data packet addressing and data packet payload data contained within the data packet.

7 . The method of claim 1 , further comprising selecting components of the data packet to be contents of a subset of data contained within the data packet, wherein the information associated with the data packet comprises only the subset.

8 . The method of claim 7 , wherein the subset comprises only information to identify the data packet for correlation of a receipt acknowledgement with the data packet.

9 . A method, comprising:
receiving, at a controller node, information associated with a data packet from a first forwarder node, the first forwarder node being any forwarder node within a plurality of forwarder nodes each monitoring communications along separate communications paths, each forwarder node further communicating with the controller node; receiving, from a second forwarder node subsequent to receiving the information, an indication of a receipt acknowledgement for the data packet, the second forwarder node being separate from the first forwarder node and the controller node; correlating the indication of the receipt acknowledgement with the data packet; and based on correlating the indication of the receipt acknowledgment with the data packet, deleting data associated with retransmission processing of the data packet.

10 . The method of claim 9 , wherein the first forwarder node and the second forwarder node are separate from one another,
wherein the first forwarder node monitors a first communications path, and wherein the second forwarder node monitors a second communications path, the first communications path and the second communications path each comprising independent, alternative communications paths of a communications channel communicatively coupling a source node and a destination node.

11 . The method of claim 9 , further comprising:
determining, after an acknowledgement timeout time interval, a lack of an indication of a receipt acknowledgment for the data packet; and based on determining the lack of the indication, causing transmission of a retransmission packet corresponding to the data packet.

12 . The method of claim 11 ,
wherein the information associated with the data packet comprises identification information for the data packet, and wherein the causing retransmission of the retransmission packet comprises instructing the first forwarder node to send the retransmission packet.

13 . The method of claim 11 ,
wherein the information associated with the data packet comprises data packet addressing data and data packet payload data contained within the data packet, and the method further comprising: storing the information associated with the data packet; and creating, based on determining the acknowledgement timeout time interval, the retransmission packet, and wherein the causing retransmission of the retransmission packet comprises transmitting the retransmission packet to a destination node specified for the data packet.

Assignees

• IBM

Inventors

• Le Thai Franck
• Nahum Erich M
• Pappas Vasileios
• Verma Dinesh

Classifications

• H04L49/252

  Store and forward routing · CPC title

• H04L45/24

  Multipath · CPC title

• H04L45/70 Primary

  Routing based on monitoring results · CPC title

• H04L45/42

  Centralised routing · CPC title

• H04L45/742

  Route cache; Operation thereof · CPC title