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Tracking fragmented data flows

A data stream and fragment technology, applied in the network field, can solve problems such as fragment stream not working

Inactive Publication Date: 2013-06-05
JUMIPER NETWORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, simple stream mapping systems such as those that work on layer 3 and layer 4 information do not work well for fragmented streams

Method used

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  • Tracking fragmented data flows
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  • Tracking fragmented data flows

Examples

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example

[0082] Figure 11A and 11B is a schematic diagram of an example of the process described herein. Such as Figure 11A As shown, a first fragment of a fragmented data unit may be received. It is assumed that the first fragment is also the initial fragment received for the data stream associated with the fragmented data unit. Entries can be created in the flow table. For example, the flow identifier can be determined from information in the first segment, such as L3 information, L4 information, and / or protocol information, as described above. Assume that the stream identifier corresponds to the value "A". An entry may be stored at an address location corresponding to the flow identifier value A in the flow table.

[0083] Entries can also be created in fragment memory. For example, the segment key may be determined according to information in the first segment (eg, L3 information and segment identification information), as described above. Assume that the segment key corr...

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Abstract

A device may receive a fragment of a fragmented data unit (810), determine a flow identifier that identifies a data flow with which the fragment is associated (820), and create a flow entry (830), based on the flow identifier, to store information associated with the data flow. The device may also determine a fragment key associated with the fragment (840), store a pointer to the flow entry based on the fragment key, correlate the fragment and another fragment (880), associated with the data flow, based on the fragment key and the pointer to the flow entry, and accumulate statistics associated with the fragment and the other fragment after correlating the fragment and the other fragment.

Description

technical field [0001] The present invention relates to the network field, and in particular, relates to tracking fragment data flow. Background technique [0002] Network devices typically track data flow status using flow tables. Flow tables use layer 3 and layer 4 information in packet headers to identify and track individual data flows. However, when a packet is split into fragments, layer 4 information is only carried in the first packet. The second and subsequent packets carry layer 3 information, not layer 4 information. Therefore, simple stream mapping systems such as those that work based on layer 3 and layer 4 information do not work well for fragmented streams. Contents of the invention [0003] According to one embodiment, a method performed by a device may include: receiving a first fragment of a fragmented data unit; determining a flow identifier identifying a data flow associated with the first fragment; Create entries in to store information related to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06H04L9/00
CPCH04L47/2441H04L47/2483H04L47/10H04L43/026H04L49/9094
Inventor 大卫·罗厄尔杰克·科恩古奈什·艾巴伊
Owner JUMIPER NETWORKS INC
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