Method for recombining IP message

A technology of IP message and IP fragmentation, which is applied in the field of IP message, can solve the problem that IP fragmentation cannot be handled simply and effectively, and achieve the effect of simplifying the implementation method of reorganization and reducing the implementation cost

Inactive Publication Date: 2009-07-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The purpose of the present invention is to provide a method for reorganizing IP message fragments, so as to solve the problem in the prior art that IP fragments that exceed the length limit of equipment reassembly cannot be handled simply and effectively

Method used

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  • Method for recombining IP message
  • Method for recombining IP message

Examples

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Embodiment Construction

[0033] The basic principle of the present invention is that when adding encapsulation headers to packet fragments reorganized by convergence devices of various IP-based tunnel technologies such as L2TP, the fragments that exceed the reassembly length limit, the fragments that are less than the reassembly length limit, and just Fragments that exceed the reassembly length limit are processed separately. Fragments that are smaller than the reassembly length limit are forwarded to the reassembly module for reassembly, and fragments that are greater than the reassembly length limit are directly transparently forwarded. For those that just exceed the reassembly length limit The fragments send their virtual trailers to the reassembly module while directly transparently transmitting and forwarding them. The reassembly module completes the reassembly based on the fragments and virtual trailers that are less than the reassembly length limit.

[0034] as attached image 3 As shown, A, B ...

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Abstract

The invention discloses a method for recombining IP messages. The method includes the following steps: a. IP fragments whose route selection module is smaller than the recombination length limit of the recombination device are forwarded to the recombination module, and IP fragments that are larger than the recombination length limit The direct transparent transmission and forwarding of the IP fragments that just cross the reassembly length limit will be passed to the reassembly module to participate in the reassembly while transparently forwarding the IP fragments; b. The reassembly module forwards the IP fragments and offsets according to the routing module After reassembly, it is forwarded as a new IP fragment. The present invention overcomes the deficiencies of the prior art, and separately processes fragments that do not exceed the length limit of the reorganization, fragments that exceed the length limit, and fragments that just cross the length limit, and only by judging the length range of the fragments, the Packet forwarding, and ensuring that IP packets that do not exceed the length limit can be reassembled normally, simplifying the reorganization implementation method of IP fragmentation, and reducing implementation costs.

Description

technical field [0001] The present invention relates to the technical field of IP messages, in particular to the fragment reassembly technology of IP messages. Background technique [0002] Because the Ethernet has the characteristics of low cost, flexible networking and good scalability, more and more IP (Internet Protocol) data is carried on the Ethernet, but because the Ethernet has an upper limit of 1500Byte for the payload length, resulting in When IP packets pass through the Ethernet, the packets that are too long must be fragmented and reassembled. [0003] In the data structure of the IP message in RFC0791 (Internet Protocol Specification) of the IETF, the data field used for fragment reassembly is defined, and the data structure of the IP message header is as follows: [0004] [0005] The data structure is described as follows: [0006] [0007] [0008] Among them, the fields that play a key role in fragment reassembly are Total Length, Identification, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L47/43
Inventor 何军
Owner HUAWEI TECH CO LTD
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