CN104660472A - Number matching method and device of L2TP (layer 2 tunneling protocol) network simulation system - Google Patents

Abstract

The present invention relates to a number allocation method and device for a Layer 2 Tunneling Protocol L2TP network simulation system, wherein the method includes: a data packet monitoring unit monitors the LAC output port signal of the access concentrator, intercepts the data packet sent by the LAC output port, and uses the data packet To establish data communication between the user equipment UE and the L2TP network server LNS; the data packet contains the IP address of the LAC, the serial port ID of the LAC, and the destination receiving end ID of the data packet; according to the IP address of the LAC and the serial port ID of the LAC, the UE is searched The preset file of the UE, extract the called number of the UE, the calling number of the UE from the preset file; add the called number and the calling number to the data packet; send the changed packets to the destination receiver. The invention realizes the simulation of terminal dialing access to the L2TP network, thereby truly restoring the access operation process of the wireless data private network.

Description

Number allocation method and device for L2TP network simulation system

technical field

The invention relates to the technical field of communication, in particular to a number allocation method and device for a network simulation system of the Layer 2 Tunneling Protocol (L2TP).

Background technique

Layer 2 Tunneling Protocol (L2TP) is an industry standard internet tunneling protocol. In broadband communication network and mobile communication network, terminal equipment dial-up mode is widely used to access L2TP network. Especially for wireless data private network products based on mobile communication networks, it uses dial-up access to the L2TP network to connect wireless terminals to the enterprise's L2TP Network Server (L2TP Network Server, LNS) through the L2TP Access Concentrator (L2TP Access Concentrator, LAC) . Among them, in the L2TP protocol, the LAC and the LNS are devices at both ends of the L2TP tunnel, the LAC initiates a tunnel establishment request to the LNS, and the LNS accepts the LAC's request to establish the L2TP tunnel. Usually, the telecom operator's equipment serves as the LAC, while the enterprise customer's equipment serves as the LNS.

With the optimization of 3G network and the construction of 4G network, more and more enterprises need to build their own wireless data private network, and before building a real private network system, they can first use the virtual wireless data private network business of the simulation system of L2TP network Details, in addition, the simulation system can also be used for program verification, troubleshooting, etc. However, due to the lack of a dial-up mechanism for terminal equipment, the existing simulation system can only simulate the private wireless data network services related to the non-dial-up access of the terminal to the L2TP network. Network services cannot be verified, seriously affecting the research work on solutions related to wireless data private networks.

Contents of the invention

The present invention provides a number allocation method and device for a Layer 2 Tunneling Protocol L2TP network simulation system, which is used to solve the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, and realizes the terminal The simulation of dial-up access to the L2TP network, thus truly restoring the access operation process of the wireless data private network.

The invention provides a number allocation method of a two-layer tunnel protocol L2TP network simulation system, comprising:

The data packet monitoring unit monitors the LAC output port signal of the access concentrator, intercepts the data packet sent by the LAC output port, and the data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; the data packet contains The IP address of the LAC, the serial port identifier of the LAC, and the destination receiver identifier of the data packet;

The data packet monitoring unit searches for the preset file of the UE according to the IP address of the LAC and the serial port identifier of the LAC, and extracts the called number of the UE and the primary number of the UE from the preset file. call number;

The data packet monitoring unit adds the called number and the calling number to the data packet; sends the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet.

The present invention also provides a number allocation device of a two-layer tunneling protocol L2TP network simulation system, including: a data packet monitoring unit; the data packet monitoring unit includes:

The monitoring module is used to monitor the LAC output port signal of the access concentrator, and intercepts the data packet sent by the LAC output port, and the data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; in the data packet Including the IP address of the LAC, the serial port identifier of the LAC, and the destination receiver identifier of the data packet;

A search module, configured to search for a preset file of the UE according to the IP address of the LAC and the serial port identifier of the LAC, and extract the called number of the UE and the UE's ID from the preset file. calling number;

A sending module, configured to add the called number and the calling number to the data packet; send the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet.

The number matching method and device of the two-layer tunneling protocol L2TP network simulation system provided by the present invention monitor and access the LAC output port of the access concentrator through the data packet monitoring unit, intercept the data packet sent by it, and according to the LAC IP address in the data packet, the LAC serial port Identify, search for the preset file of the UE, extract the calling and called numbers of the UE from the preset file, thereby add the calling and called numbers of the UE to the data packet, and then send the changed data packet to the destination receiving end. This solves the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, realizes the simulation of the terminal dial-up access to the L2TP network, and truly restores the access operation process of the wireless data private network .

Description of drawings

Fig. 1 is the flow chart of embodiment one of the number matching method of the two-layer tunneling protocol L2TP network emulation system of the present invention;

Fig. 2 is the flow chart of embodiment two of the number matching method of the two-layer tunneling protocol L2TP network emulation system of the present invention;

Fig. 3 is a structural schematic diagram of Embodiment 1 of the number allocation device of the two-layer tunneling protocol L2TP network simulation system of the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 2 of the number allocation device of the L2TP network simulation system of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Fig. 1 is the flow chart of embodiment one of the number matching method of the two-layer tunneling protocol L2TP network emulation system of the present invention, as shown in Fig. 1, the method of the present embodiment comprises:

Step 101, the data packet monitoring unit monitors the LAC output port signal of the access concentrator, and intercepts the data packet sent by the LAC output port.

In this step, first introduce the method of UE dial-up access to the L2TP network in the prior art. The UE pre-accesses the L2TP network, and first performs Link Control Protocol (Link Control Protocol, referred to as: LCP) negotiation with the LAC; Send it to the LAC Radius server, and the operator-side LACRradius server performs authentication, audit, authorization and other operations on the UE; since the UE accesses through the dial-up mechanism, the LAC Radius server can communicate with the UE according to the calling and called numbers of the UE. Services related to the called number, such as the operator billing the UE; the LAC Radius server sends the LNS address to the LAC according to the domain name, so that the LAC sends an L2TP tunnel request to the LNS, and then the enterprise-side LNS Radius server authenticates and authorizes the UE , Audit operation, the LNS Radius server also implements services related to the number such as billing according to the calling and called numbers of the UE. Among them, the LACRadius server belongs to the operator side, and the Radius server of the LNS belongs to the enterprise side that provides private wireless data network services. Therefore, both need the calling and called number information of the UE to implement corresponding services. The calling number is used to identify the UE pre-accessed to the L2TP network, so that LAC and LNS can perform billing and auditing on the UE according to the calling number of the UE; the called number is used to distinguish the type of UE pre-access service, for example Data services, voice services, etc. are also used to distinguish different levels of services in the same service type, so that LAC and LNS can perform hierarchical charging and auditing based on the called number of the UE. It can be seen that in the prior art, since the UE accesses the enterprise LNS through a dial-up mechanism, the calling and called number information of the UE is automatically included in its link data packet, so that the operator LAC and the enterprise LNS can obtain the number information, and perform services for number information. In the simulation system, because there is no dialing mechanism, the system cannot identify the UE through the calling number. Therefore, the simulation system first needs to accurately identify the UE, and then assign the calling and called numbers to the identified UE, so that the simulation system can Simulate services related to calling and called numbers. Specifically, in the simulation system, the UE is connected to the LAC through a serial interface. There can be multiple LACs in the network, and each LAC is identified by the LAC IP address; each LAC has a certain number of serial interfaces, and each serial interface is controlled by the serial port Identification distinction, such as Serial0/0, Serial0/1. In the simulation system, each UE is connected to a serial interface of a LAC, and the relationship between which UE is connected to which serial interface is preset. By locating the IP address of the LAC and the serial port identifier of the LAC, the serial port can be identified. The UE connected to the interface. Specifically, in the link between LAC and LAC Radius, and in the link between LAC and LNS, a data packet monitoring unit is set, and the data packet monitoring unit monitors the output port signal of the LAC in real time. When the port signal indicates that there is data output , the data packet sent by the LAC output port is intercepted, and the data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; the data packet includes the IP address of the LAC, the serial port identifier of the LAC, and the destination receiving end of the data packet logo. The IP address of the LAC is used to identify the LAC, and the serial port ID of the LAC is used to identify the serial interface connected to the UE that initiates the call request. For example, if a certain UE is connected to the LAC with an IP address of 10.0.01 and is connected to the serial interface Serial0/0 of the LAC, the UE is identified by (10.0.0.1, Serial0/0).

Step 102, the data packet monitoring unit searches the UE's preset file according to the IP address of the LAC and the serial port ID of the LAC, and extracts the called number of the UE and the calling number of the UE from the preset file.

In this step, the data packet monitoring unit uniquely identifies the calling UE according to the IP address of the LAC and the serial port identifier of the LAC, and searches for a preset file. UE preset calling and called number information. The data packet monitoring unit extracts the called number of the UE and the calling number of the UE from the preset file. Therefore, the UE in the simulation system has the calling number under the dialing mechanism and the called number identifying the service type or service level.

Step 103, the data packet monitoring unit adds the called number and the calling number to the data packet; sends the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet.

In this step, the data packet monitoring unit adds the calling and called numbers extracted from the preset file into the data packet, and reads the destination receiving end identifier from the data packet, which can be the IP address of the destination receiving end. information, and send the modified data packet added with the calling and called number information to the destination receiving terminal corresponding to the destination receiving terminal identifier.

The number allocation method of this embodiment monitors the LAC output port of the access concentrator through the data packet monitoring unit, intercepts the data packet sent by it, and searches for the preset file of the UE according to the LAC IP address and the LAC serial port identifier in the data packet, and starts from the preset Extract the UE's calling and called numbers from the configuration file, thereby adding the UE's calling and called numbers to the data packet, and then sending the changed data packet to the destination receiving end. This solves the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, realizes the simulation of the terminal dial-up access to the L2TP network, and truly restores the access operation process of the wireless data private network .

Fig. 2 is the flow chart of embodiment two of the number matching method of the two-layer tunneling protocol L2TP network simulation system of the present invention, as shown in Fig. 2, the method of the present embodiment comprises:

Step 201, the data packet monitoring unit monitors the LAC output port signal of the access concentrator, and intercepts the data packet sent by the LAC output port.

In this step, the data packet is used to establish data communication between the user equipment UE and the L2TP network server LNS; the data packet includes the IP address of the LAC, the serial port identifier of the LAC, and the destination identifier of the data packet. For the specific implementation process of this step, refer to step 101 in Embodiment 1, which will not be repeated here.

Step 202, the packet monitoring unit searches the user database for a data table corresponding to the IP address of the LAC according to the IP address of the LAC; searches the data table for the UE's preset file corresponding to the serial port ID of the LAC according to the serial port ID of the LAC .

In this step, the UE is connected to the LAC through the serial interface. There can be multiple LACs in the network, and each LAC is identified by the LAC IP address; each LAC has a certain number of serial interfaces, and each serial interface is distinguished by the serial port identifier , such as Serial0/0, Serial0/1. In the simulation system, each UE is connected to a serial interface of a LAC, and the relationship between which UE is connected to which serial interface is preset. By locating the IP address of the LAC and the serial port identifier of the LAC, the serial port can be identified. The UE connected to the interface. When the data packet monitoring unit intercepts a data packet sent by a LAC output port, firstly, according to the IP address of the LAC, search the data table corresponding to the IP address of the LAC in the user database; then search in the data table according to the serial port identification of the LAC The UE's preset file corresponding to the serial port ID of the LAC, so as to identify the UE and locate its corresponding preset file.

Step 203, the data packet monitoring unit extracts the called number of the UE and the calling number of the UE from the preset file.

For the specific implementation process of this step, refer to step 102 in Embodiment 1, which will not be repeated here.

Step 204, the data packet monitoring unit adds the called number and calling number to the data packet; sends the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet.

In this step, the data packet monitoring unit adds the calling and called numbers extracted from the preset file into the data packet, and reads the destination receiving end identifier from the data packet, wherein the destination receiving end identifier is used for The destination receiving end is identified, and the destination receiving end includes: a Radius server for processing the Radius protocol, and/or an LNS server for processing the L2TP protocol. The identifier may be the IP information of the destination receiver, and the modified data packet added with the calling and called number information is sent to the destination receiver corresponding to the identifier of the destination receiver.

Further, the number allocation method further includes that the access concentrator LAC acquires the serial port identifier of the LAC corresponding to the UE connected to the LAC, and adds the serial port identifier of the LAC to the data packet.

Specifically, in the real system, the UE is identified according to the calling number of the UE. Therefore, the data packet sent by the LAC to the enterprise LNS does not need to add the serial port identification information corresponding to the UE connected to it. But for the simulation system, regardless of whether the data packet is sent to the operator-side device or the enterprise-side device, the UE needs to be identified through the serial port ID. Therefore, the LAC needs to first read the serial port ID corresponding to the UE connected to it, and add the The serial port of the LAC is identified in the data packet, so that the data packet monitoring unit that intercepts the data packet can uniquely identify the UE through the serial port identification and the IP address of the LAC that sent the data packet, and complete the number matching.

The number allocation method of this embodiment monitors the LAC output port of the access concentrator through the data packet monitoring unit, intercepts the data packet sent by it, and searches for the preset file of the UE according to the LAC IP address and the LAC serial port identifier in the data packet, and starts from the preset Extract the UE's calling and called numbers from the configuration file, thereby adding the UE's calling and called numbers to the data packet, and then sending the changed data packet to the destination receiving end. This solves the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, realizes the simulation of the terminal dial-up access to the L2TP network, and truly restores the access operation process of the wireless data private network .

Fig. 3 is a schematic structural diagram of Embodiment 1 of the number matching device of the Layer 2 Tunneling Protocol L2TP network simulation system of the present invention. As shown in Fig. 3, the device of this embodiment includes: a data packet monitoring unit 1, and the data packet monitoring unit 1 includes: The monitoring module 11 is used to monitor the LAC output port signal of the access concentrator and intercept the data packet sent by the LAC output port. The data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; the data packet contains the IP address of the LAC , the serial port identification of the LAC, the destination receiving end identification of the data packet; the search module 12 is used to search the preset file of the UE according to the IP address of the LAC and the serial port identification of the LAC, and extract the called number of the UE from the preset file . The calling number of the UE; the sending module 13 is used to add the called number and the calling number to the data packet; according to the destination receiving end identifier of the data packet, send the changed data packet to the destination receiving end.

The device of this embodiment can be used to implement the technical solution of the first method embodiment shown in FIG. 1 , and its implementation principle and technical effect are similar, and will not be repeated here.

The number allocation device of this embodiment listens to the LAC output port of the access concentrator through the data packet monitoring unit, intercepts the data packet sent by it, and searches for the preset file of the UE according to the LAC IP address and the LAC serial port identifier in the data packet, from the preset Extract the UE's calling and called numbers from the configuration file, thereby adding the UE's calling and called numbers to the data packet, and then sending the changed data packet to the destination receiving end. This solves the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, realizes the simulation of the terminal dial-up access to the L2TP network, and truly restores the access operation process of the wireless data private network .

Fig. 4 is a schematic structural diagram of Embodiment 2 of the number allocation device of the Layer 2 Tunneling Protocol L2TP network simulation system of the present invention. As shown in Fig. 4, the device of this embodiment is based on the device shown in Fig. The end includes: a Radius server for processing the Radius protocol, and/or an LNS server for processing the L2TP protocol. The search module 12 is specifically used to search the data table corresponding to the IP address of the LAC in the user database according to the IP address of the LAC; according to the serial port identification of the LAC, the preset file of the UE corresponding to the serial port identification of the LAC is searched in the data table . The device also includes: an access concentrator LAC2; LAC2 is used to obtain the serial port ID of LAC2 corresponding to the UE connected to the LAC2, and add the serial port ID of LAC2 to the data packet.

The device of this embodiment can be used to implement the technical solution of the second embodiment of the method shown in FIG. 2 , and its implementation principle and technical effect are similar, and will not be repeated here.

The number allocation device of this embodiment listens to the LAC output port of the access concentrator through the data packet monitoring unit, intercepts the data packet sent by it, and searches for the preset file of the UE according to the LAC IP address and the LAC serial port identifier in the data packet, from the preset Extract the UE's calling and called numbers from the configuration file, thereby adding the UE's calling and called numbers to the data packet, and then sending the changed data packet to the destination receiving end. This solves the technical problem that the simulation system in the prior art cannot truly restore the terminal dial-up access to the L2TP network due to the lack of a dial-up mechanism, realizes the simulation of the terminal dial-up access to the L2TP network, and truly restores the access operation process of the wireless data private network .

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (8)

1. a kind of number allocation method of two-layer tunneling protocol L2TP network emulation system, it is characterized in that, comprising: The data packet monitoring unit monitors the LAC output port signal of the access concentrator, intercepts the data packet sent by the LAC output port, and the data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; the data packet contains The IP address of the LAC, the serial port identifier of the LAC, and the destination receiver identifier of the data packet; The data packet monitoring unit searches for the preset file of the UE according to the IP address of the LAC and the serial port identifier of the LAC, and extracts the called number of the UE and the primary number of the UE from the preset file. call number; The data packet monitoring unit adds the called number and the calling number to the data packet; sends the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet. 2. The method according to claim 1, wherein the destination receiving end comprises: a Radius server for processing the Radius protocol, and/or an LNS server for processing the L2TP protocol. 3. The method according to claim 1, wherein the packet monitoring unit searching for the preset file of the UE according to the IP address of the LAC and the serial port identifier of the LAC comprises: According to the IP address of the LAC, the data packet monitoring unit searches the user database for a data table corresponding to the IP address of the LAC; The preset file of the UE corresponding to the serial port identifier. 4. The method according to claim 1, further comprising: The access concentrator LAC obtains the serial port identifier of the LAC corresponding to the UE connected to the LAC, and adds the serial port identifier of the LAC to the data packet. 5. A number matching device of a two-layer tunneling protocol L2TP network emulation system, characterized in that, comprising: a data packet monitoring unit; the data packet monitoring unit includes: The monitoring module is used to monitor the LAC output port signal of the access concentrator, and intercepts the data packet sent by the LAC output port, and the data packet is used to establish the data communication between the user equipment UE and the L2TP network server LNS; in the data packet Including the IP address of the LAC, the serial port identifier of the LAC, and the destination receiver identifier of the data packet; A search module, configured to search for a preset file of the UE according to the IP address of the LAC and the serial port identifier of the LAC, and extract the called number of the UE and the UE's ID from the preset file. calling number; A sending module, configured to add the called number and the calling number to the data packet; send the modified data packet to the destination receiving end according to the identification of the destination receiving end of the data packet. 6. The device according to claim 5, wherein the destination receiving end comprises: a Radius server for processing the Radius protocol, and/or an LNS server for processing the L2TP protocol. 7. The device of claim 5, wherein: The search module is specifically configured to search the user database for a data table corresponding to the IP address of the LAC according to the IP address of the LAC; search for a data table corresponding to the The preset file of the UE corresponding to the serial port identifier of the LAC. 8. The device according to claim 5, further comprising: an access concentrator LAC; The LAC is configured to acquire the serial port identifier of the LAC corresponding to the UE connected to the LAC, and add the serial port identifier of the LAC to the data packet.