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Recombination method for IP fragment messages and device thereof

An IP fragmentation and message technology, applied in the field of network communication, can solve problems such as VPN, avoid errors and mutual influence, improve transmission quality, and improve stability

Active Publication Date: 2010-02-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the IPv6 protocol appeared later than the IPv4 protocol, the reassembly process of the IPv6 message still only considers the content of the IP header itself, and does not consider the VPN. Therefore, the reassembly process of the IPv6 message also has the same problem as the IPv4 reassembly process.

Method used

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  • Recombination method for IP fragment messages and device thereof
  • Recombination method for IP fragment messages and device thereof
  • Recombination method for IP fragment messages and device thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] figure 2 It shows the situation that the router device processes fragmented messages in different VPNs after using the IP reassembly process of the present invention. It can be seen from the schematic diagram that the reassembly module is the same as VRF, logically there is one for each VPN, but in fact there is only one reassembly module in the entire router device, only a slight change has been made to the original reassembly module. When whether the fragmented packets belong to the same original packet, in addition to comparing the IP_ID, source IP address, destination IP address, and the four fields in the IP header of the protocol number, the VPN_ID of the packet is also compared. Only the fragments under the same VPN Only when the packets are sent from the same original packet can they be reassembled together.

[0029]...

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PUM

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Abstract

The invention discloses a method and a system for improving the existing IP recombination process, wherein the IP fragment messages belonging to different VPNs (Virtual Private Networks) are not influenced with each other during recombination by increasing the judgment of the VPNs belonged in the messages for the existing recombination module. The application of the invention can avoid the possibility that IP fragment messages of different VPNs are influenced with each other during recombination, thereby supplementing the description of RFC protocol about IP recombination process, improving the existing IP recombination process, being capable of improving the stability of network device, and improving the transmission quality of IP network. The invention is suitable for IPv4 recombinationand IPv6 recombination, and is independent of the implementation way of VPN.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and device for recombining IP fragmented messages. Background technique [0002] IP is the core protocol in the TCP / IP protocol suite. All TCP, UDP, ICMP and IGMP data are transmitted in IP datagram format, and the data unit encapsulated by IP protocol is called IP message. The lower layer protocol of the IP protocol is the link layer protocol. For most link layer protocols, the length of the data frame that can be transmitted has an upper limit. For example, the maximum length of the transmittable length of Ethernet and 802.3 is 1500 respectively. And 1492 bytes, this feature of the link layer is called MTU, the largest transmission unit. [0003] If the IP layer has a data message to be transmitted, and the length of the data is larger than the MTU of the link, then the IP layer needs to fragment the IP message so that the length of each message is not ...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/46H04L29/06
CPCH04L12/4641
Inventor 赵丰收姚俊郭树波汪勇单丽杰谈青
Owner ZTE CORP
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