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Data transmission method and device based on NAT (Network Address Translation) address translation

A data transmission method and address translation technology are applied in the field of data transmission methods and devices based on NAT address translation, which can solve the problems of inability to distinguish sending data, inability to implement NAT devices, etc., and achieve the effect of simplifying network planning and simplifying network maintenance.

Active Publication Date: 2012-07-11
XINHUASAN INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] like figure 1 As shown, it is a schematic diagram of the PIM SSM network. In the PIM SSM network, the situation of NAT equipment cannot be realized in the prior art
Specifically, when three multicast source devices in the private network send data to the public network, since the three multicast source devices all use PIM SSM technology, the group addresses of the data are the same, and the source address (private network address ) are different; on the NAT device, the source address will be converted to the same public network address, so that the subsequent data sent to different multicast source devices cannot be distinguished

Method used

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  • Data transmission method and device based on NAT (Network Address Translation) address translation
  • Data transmission method and device based on NAT (Network Address Translation) address translation
  • Data transmission method and device based on NAT (Network Address Translation) address translation

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Embodiment Construction

[0050] The present invention proposes a data transmission method based on NAT address translation, such as figure 2 As shown, it is a schematic diagram of the application scene of the present invention, and the method is applied to multicast source equipment (such as multicast source 1, 2, 3), receiver equipment (ie client), NAT equipment and management server (ie video program management server) in the PIM SSM network (such as the network using PIM SSM technology in video-on-demand application scenarios such as IPTV). The NAT device is used to implement address translation when accessing between any two networks. These two networks are called the internal network (intranet) and the external network (external network), and the multicast source device is located in the internal network, and the receiver device and the management server are located on the external network; usually, the private network is the internal network, and the public network is the external network.

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Abstract

The invention discloses a data transmission method and a device based on NAT (Network Address Translation) address translation. The method comprises the steps that a management server receives a data request message from a receiver device, wherein the data request message carries an identifier of a multicast source device, required to be checked; the management server obtains an internal network IP (internet protocol) address of the multicast source device through the identifier of the multicast source device and distributes an external network IP address for the multicast source device; the management server informs the receiver device of the external network IP address of the multicast source device; and the management server informs a NAT device of the external network IP address and the internal network IP address of the multicast source device. In the invention, the multicast data can be ensured not to be influenced when penetrating through the NAT.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a data transmission method and equipment based on NAT address translation. Background technique [0002] The current multicast networking technologies include: (1) PIM-DM (Dense Mode Multicast Routing Protocol), using the "Push (Push) mode" to transmit multicast data, usually suitable for small networks with relatively dense multicast group members ; (2) PIM-SM (Multicast Routing Protocol in Sparse Mode), which uses "Pull (Pull) mode" to transmit multicast data, is usually applicable to large and medium-sized networks with relatively scattered distribution of multicast group members and a wide range, and PIM SM does not care about the specific multicast source address; (3) PIM (Protocol Independent Multicast, Protocol Independent Multicast) SSM (Source-Specific Multicast, specified source multicast), which provides a solution for specified source multicast, And PIM SSM can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/12
Inventor 王军周迪
Owner XINHUASAN INFORMATION TECH CO LTD
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