CN108076161A - A kind of IP address management method and apparatus - Google Patents

Abstract

The embodiment of the present invention discloses an IP address management method and device, which relate to the field of communication technology, can reduce the possibility of misjudgment of user terminals that execute network illegal events, and improve the accuracy of determined user terminals that execute network illegal events. sex. The specific scheme is: the BRAS receives the offline message sent by the first user terminal; the above-mentioned BRAS starts from the BRAS receiving the offline message sent by the above-mentioned first user terminal, and after a preset grace period, puts the first Internet Protocol IP address Entering an idle address set, the above-mentioned idle address set is used to provide IP addresses for online user terminals; after the above-mentioned BRAS receives the online request of the second user terminal, it allocates the second IP address in the above-mentioned idle address set to the above-mentioned second user terminal. The embodiment of the present invention is applied in the process of BRAS allocating IP addresses for user terminals.

Description

Method and device for IP address management

technical field

The invention relates to the field of communication technology, in particular to an IP address management method and equipment.

Background technique

Broadband Remote Access Server (English: Broadband Remote Access Server, BRAS for short) is a new type of access gateway oriented to broadband network applications. Wherein, the BRAS may assign a protocol (English: Internet Protocol, IP for short) address for inter-network interconnection to a user terminal accessing the network.

Generally speaking, the IP address assigned by the BRAS to a user terminal is fixed, and in the network transmission process based on the Ethernet point-to-point connection protocol (English: Point to Point Protocol over Ethernet, PPPoE for short), the BRAS The IP addresses assigned to a PPPoE terminal (that is, user terminal) may be different when the PPPoE terminal goes online twice. For example, after PPPoE terminal 1 goes online, BRAS can select an idle IP address (recorded as IP address a) from the IP address pool and assign it to PPPoE terminal 1; when PPPoE terminal 1 goes offline, BRAS can immediately release the IP address a, make the IP address a idle; and then assign the IP address a to the PPPoE terminal 2 when the PPPoE terminal 2 goes online. In this way, when the PPPoE terminal 1 goes online again, the IP address allocated by the BRAS to the PPPoE terminal 1 again may not be the above-mentioned IP address a.

However, there is a problem: because an IP address is not fixedly assigned to a certain PPPoE terminal, for example, after PPPoE terminal 1 goes offline, the BRAS can immediately release the IP address a and assign the above IP address a to PPPoE Terminal 2; therefore, if PPPoE terminal 1 goes offline immediately after using IP address a to carry out network violations, and then checks the user terminal that carried out network violations, since IP address a is assigned to PPPoE terminal 2, it may be determined to execute The user terminal of the network violation event is PPPoE terminal 2 . In this way, there will be a misjudgment of the user terminal performing the network illegal event.

Contents of the invention

Embodiments of the present application provide an IP address management method and device, which can reduce the possibility of misjudgment of user terminals that perform network violations, and improve the accuracy of the determined user terminals that perform network violations.

In order to achieve the above object, the embodiments of the present application adopt the following technical solutions:

In a first aspect, the present application provides an IP address management method, including: the broadband remote access server BRAS receives the offline message sent by the first user terminal; the BRAS receives the offline message sent by the first user terminal from the BRAS At first, after a preset grace time, put the first IP address into the idle address set, the above-mentioned first IP address is the IP address allocated by the BRAS for the first user terminal when the above-mentioned first user terminal goes online, and the above-mentioned The IP addresses in the idle address set are used by the BRAS to allocate IP addresses for the online user terminals.

Wherein, in this solution, the BRAS may put the first IP address into the online IP address after the first user terminal is offline (that is, after receiving the offline message sent by the first user terminal) and after a preset grace period. In the free address set of IP addresses provided by user terminals, that is, in this solution, the first IP address can only be assigned to other online users by the BRAS after the first user terminal goes offline after a preset grace time terminal. In this way, it can be solved that after the first user terminal goes offline, the first IP address is allocated to other online user terminals, and when the first user terminal uses the first IP address to perform a network illegal event, the inability to According to the first IP address, the problem of accurately locating the user terminal that actually carried out the network violation event can reduce the possibility of misjudging the user terminal that carried out the network violation event, and improve the accuracy of the determined user terminal that carried out the network violation event. sex.

In a possible implementation manner, after receiving the offline message sent by the first user terminal, the BRAS releases the first IP address, so that the first IP address is in an idle state, and then after a preset grace period, sends the first IP address to the An IP address is put into the free address set. In this way, it can be guaranteed that the IP addresses in the idle address set are all idle IP addresses.

In a possible implementation manner, the BRAS may allocate the second IP address in the idle address set to the second user terminal after receiving the online request of the second user terminal; the BRAS assigns the second IP address Switching from an idle state to a used state; wherein, the above-mentioned second IP address is the same as the above-mentioned first IP address, or the above-mentioned second IP address is different from the above-mentioned first IP address. Wherein, since the IP addresses in the idle address set are put into the idle address set after the user terminal using the IP address goes offline after a preset grace time; therefore, the user terminal originally using the IP address executes There is at least a preset grace period between the network violation event and the allocation of the IP address to the new user equipment by the BRAS. In this way, even if the user terminal that originally used the IP address performed a network violation event during the use of the IP address, the possibility of misjudgment of the user terminal that performed the network violation event can be reduced through the above-mentioned threshold grace time, and the determination of the illegal event can be improved. The accuracy of the user terminal performing the network violation event.

In a possible implementation manner, the above idle address set is an idle address queue. Wherein, in the IP address management method protected by the present application, the IP addresses in the idle address queue are used by the BRAS to allocate IP addresses for online user terminals according to the first-in-first-out principle. For example, after the first user terminal goes offline, the BRAS can put the IP address (first IP address) assigned to the first user terminal into the queue tail of the above-mentioned idle address queue after a preset grace period, and After receiving the online request of the second user terminal, assign the IP address at the head of the idle address queue to the second user terminal. In this way, the first IP address can be allocated to the online user terminal by the BRAS only after all other IP addresses located before the first IP address in the idle address queue are allocated. In this way, on the basis of the preset grace time, the time from when the first user terminal executes a network violation event to when the BRAS allocates the first IP address to the new user equipment can be further extended.

In a possible implementation manner, before the BRAS receives the offline message sent by the first user terminal, the above-mentioned BRAS receives the online request sent by the first user terminal; the BRAS determines the first IP address from the above-mentioned idle address set, and Allocating the first IP address to the first user equipment.

In a second aspect, the present application provides a BRAS, including: a receiving module and an address control module. The receiving module is configured to receive the offline message sent by the first user terminal; the address control module is configured to start from the receiving module receiving the offline message sent by the first user terminal, and after a preset grace period, send the first IP address is put into idle address collection, and above-mentioned first IP address is the IP address that above-mentioned BRAS distributes for this first user terminal when this first user terminal goes online, and the IP address in this idle address collection is used for BRAS to be the online user The terminal is assigned an IP address.

In a possible implementation manner, the address control module is further configured to release the first IP address after the receiving module receives the offline message sent by the first user terminal, so that the first IP address is in an idle state .

In a possible implementation manner, the above receiving module is further configured to receive an online request from a second user terminal. The above-mentioned BRAS may further include: an allocation module and a switching module. The allocating module is further configured to allocate the second IP address in the free address set to the second user terminal after the receiving module receives the online request of the second user terminal. A switching module, configured to switch the second IP address from an idle state to a used state. Wherein, the second IP address is the same as the first IP address, or the second IP address is different from the first IP address; the IP address in the above-mentioned free address set is specifically used by the above-mentioned distribution module to assign IP addresses to online user terminals address.

In a possible implementation manner, the set of idle addresses is an idle address queue, and the IP addresses in the idle address queue are used by the allocation module to allocate IP addresses to online user terminals according to the first-in-first-out principle.

In a possible implementation manner, the receiving module is further configured to receive an online request of the first user terminal before receiving the offline message sent by the first user terminal. The assigning module is configured to determine the first IP address from the free address set and assign the first IP address to the first user terminal after the receiving module receives the online request of the first user terminal.

In a third aspect, the present application provides a BRAS, including: a processor, a memory, a bus, and a communication interface, where the processor, the memory, and the communication interface are connected through the bus. The above-mentioned memory is used to store computer program codes, and the computer program codes include instructions. When the processor of the BRAS executes the instructions, the BRAS executes the IP address management method in the first aspect and its various possible implementations.

In a fourth aspect, the present application provides a computer storage medium, in which computer program codes are stored, and the computer program codes include instructions. When the processor of the BRAS executes the instructions, the BRAS executes the second aspect and its various possible operations. The IP address management method in the implementation manner.

It should be noted that, for the detailed description of each module in the BRAS in the above-mentioned third aspect and the above-mentioned fourth aspect and the corresponding technical effect analysis, please refer to the detailed description in the above-mentioned second aspect and its various possible implementation modes. No longer.

Description of drawings

FIG. 1 is a schematic diagram of a network architecture applied to an IP address management method provided by an embodiment of the present invention;

FIG. 2 is a flow chart of an IP address management method provided by an embodiment of the present invention;

FIG. 3 is a flow chart of another IP address management method provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of an example of an idle address queue provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of an example of another idle address queue provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a possible structure of a BRAS provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of another possible structure of the BRAS provided by the embodiment of the present invention.

Detailed ways

The IP address management method and equipment provided by the embodiments of the present invention can be applied in the process of BRAS assigning IP addresses to user terminals.

Please refer to FIG. 1 , which shows a schematic diagram of a network architecture to which an IP address management method provided by an embodiment of the present invention is applied. As shown in FIG. 1 , the IP address allocation network architecture may include: at least one user terminal (such as user terminal 11 and user terminal 12 ) and a BRAS (such as BRAS 13 ).

The BRAS 13 in the embodiment of the present invention is a broadband network application-oriented access gateway, which can be used to assign an IP address to the user terminal after receiving the online request initiated by the user terminal; After the offline message is sent, the IP address assigned to the user terminal is released. For example, as shown in Figure 1, the BRAS 13 can be used to receive the online request sent by the user terminal 11 or the user terminal 12, and assign an IP address for the user terminal 11 or the user terminal 12; After the offline message sent by the user terminal 11 or the user terminal 12, the IP address assigned to the user terminal 11 or the user terminal 12 is released.

Exemplarily, the foregoing user terminal may be an electronic device such as a personal computer (English: Personal Computer, PC for short), a portable computer, or the like.

An IP address management method and device provided by the embodiments of the present invention are described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings:

The embodiment of the present invention provides a kind of IP address management method, as shown in Figure 2, this IP address management method comprises:

S201. The first user terminal sends an online request to the BRAS.

S202. The BRAS receives an online request sent by the first user terminal.

Wherein, each user terminal can send an online request to the BRAS when going online, and the BRAS can assign an IP address to the user terminal after receiving the online request sent by the user terminal.

S203. The BRAS assigns an IP address to the first user terminal.

Wherein, after receiving the online request sent by the first user terminal, the BRAS may assign the first user terminal an IP address that is currently in an idle state.

It should be noted that after the BRAS allocates an IP address to the first user terminal, the first user terminal can use the IP address to go online. At the same time, the user can use the first user terminal to perform network operations. For example, when the first user terminal is online, the user can use the first user terminal to perform network operations such as web page browsing and network information transmission; of course, the user can also use the first user terminal to perform network violations.

S204. The first user terminal sends an offline message to the BRAS.

Wherein, when the user does not need to perform network operations, the user may log off the first user terminal. Exemplarily, if the first user terminal includes an "offline" function option, the user can operate the "offline" function option to make the first user terminal offline when no network operation is required. Subsequently, the first user terminal may send an offline message to the BRAS to notify the BRAS that the first user terminal has gone offline. Wherein, after the first user terminal goes offline, the IP address used before it goes offline will no longer be used.

S205. The BRAS receives an offline message sent by the first user terminal.

S206. The BRAS starts from receiving the offline message sent by the first user terminal, and puts the first IP address into the idle address set after a preset grace time.

In the IP address management method provided by the embodiment of the present invention, the BRAS may not release the first IP address until the first user terminal is offline (that is, after receiving the offline message sent by the first user terminal) and after a preset grace period. into the free address set that can provide IP addresses for online user terminals; thus, the first IP address can only be assigned to other online users by the BRAS after a preset grace period after the first user terminal goes offline at the earliest user terminals; instead of assigning the first IP address to other online user terminals after the first user terminal goes offline. In this way, it is possible to solve the problem that after the first user terminal uses the first IP address to execute a network illegal event due to the fact that the first IP address is allocated to other online user terminals immediately after the first user terminal goes offline, it cannot According to the first IP address, the problem of accurately locating the user terminal that actually carried out the network violation event can reduce the possibility of misjudging the user terminal that carried out the network violation event, and improve the accuracy of the determined user terminal that carried out the network violation event. sex.

Further, the BRAS may release the first IP address after receiving the offline message sent by the first user terminal, so that the first IP address is in an idle state, and then after a preset grace period, put the first IP address into the idle state. A collection of addresses. In this way, it can be guaranteed that the IP addresses in the idle address set are all idle IP addresses.

Exemplarily, the BRAS may indicate that the IP address is in a used state (used) or an idle state (free) by setting a flag bit for each IP address. For example, when the flag bit of an IP address is 1, it means that the IP address is in use, and when the flag bit of the IP address is 0, it means that the IP address is in an idle state. After receiving the offline message sent by the first user terminal, the BRAS may release the first IP address by setting the flag of the first IP address to 0, so that the first IP address is in an idle state.

The BRAS may allocate the second IP address in the idle address set to the second user terminal after receiving the online request of the second user terminal. Wherein, the second IP address is the same as the first IP address, or the second IP address is different from the first IP address. Specifically, as shown in FIG. 3, after S206 shown in FIG. 2, the method in this embodiment of the present invention may further include S301-S303:

S301. The second user terminal sends an online request to the BRAS.

S302. The BRAS receives the online request of the second user terminal.

S303. The BRAS allocates the second IP address in the idle address set to the second user terminal.

Assume that the current time is 15:12:36 on October 15, 2016, and the preset grace time is 10 minutes. If the BRAS receives the offline request of the first user terminal at 15:12:36 on October 15, 2016, the BRAS can put the first IP address into the free address set at 15:22:36 on October 15, 2016 , that is, the first IP address can be allocated to other online user terminals starting at 15:22:36 on October 15, 2016. In this way, even if the second user terminal goes online at 15:12:36 on October 15, 2016, the first IP address cannot be assigned to the second user terminal.

In the method for allocating IP addresses provided by the embodiments of the present invention, since the IP addresses in the idle address set are all placed in the idle address set after a preset grace period after the user terminal using the IP address goes offline; therefore , there is at least a preset grace period between when the user terminal originally using the IP address executes a network violation event and when the BRAS allocates the IP address to a new user equipment. In this way, if the user terminal that originally used the IP address commits a network violation event during the use of the IP address, the BRAS can assign the IP address to other users after the above-mentioned threshold grace time has elapsed, thereby reducing the impact on network violations. The possibility of misjudgment of the user terminal of the event improves the accuracy of the determined user terminal that executes the network violation event.

Optionally, in the embodiment of the present invention, the above idle address set is an idle address queue. Wherein, the IP addresses in the idle address queue can be used by the BRAS to allocate IP addresses for online user terminals according to the first-in-first-out principle.

Exemplarily, as shown in FIG. 4 , it is a schematic diagram of an example of an idle address queue provided by an embodiment of the present invention. As shown in Figure 4, assume that the idle address queue contains 5 idle IP addresses (IP address a, IP address b, IP address c, IP address d, and IP address e), and IP address a is the After device a goes offline at 12:26:56 on September 25, 2016, it is added to the idle address queue; IP address b is the BRAS after user device b goes offline at 12:30:56 on September 25, 2016 , added to the idle address queue; IP address c was added to the idle address queue by the BRAS after user equipment c went offline at 12:30:56 on September 24, 2016; IP address d was added to the idle address queue by the BRAS in the user equipment After d went offline at 03:21:56 on September 26, 2016, it was added to the idle address queue; IP address e was BRAS after user equipment e went offline at 16:27:56 on October 1, 2016. Added to the free address queue. Since the IP addresses in the idle address queue are arranged according to the first-in-first-out principle, as shown in Figure 3, the order of the above five IP addresses in the idle address queue from the head to the tail of the queue is: IP address c , IP address a, IP address b, IP address d, and IP address e.

Assume that the current time is 15:12:36 on October 15, 2016, and the preset grace time is 10 minutes. If the BRAS receives the offline request of the first user terminal at 15:12:36 on October 15, 2016, the BRAS can put the first IP address into the IP address shown in Figure 4 at 15:22:36 on October 15, 2016. The end of the free address queue shown in FIG. 5 is obtained as shown in FIG. 5 . In this way, even at 15:22:36 on October 15, 2016, if the idle address queue also includes other IP addresses before the first IP address (such as IP address c, IP address a, IP address shown in Figure 5 Address b, IP address d and IP address e), the first IP address cannot be allocated to other online user terminals.

In this way, the IP address allocation method provided by the embodiment of the present invention can further extend the time from when the first user terminal executes a network violation event to when the BRAS assigns the first IP address to the new user equipment on the basis of the preset grace time . In addition, it can reduce the possibility of misjudgment of the user terminal performing the network violation event, and improve the accuracy of the determined user terminal performing the network violation event.

The foregoing mainly introduces the solutions provided by the embodiments of the present invention from the perspective of interaction between various network elements. It can be understood that, in order to realize the above-mentioned functions, each network element, such as the BRAS, includes corresponding hardware structures and/or software modules for performing each function. Those skilled in the art should easily realize that, in combination with the modules and algorithm steps of the examples described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the embodiments of the present invention.

In the embodiment of the present invention, the BRAS may be divided into modules according to the above method examples. For example, each module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software modules. It should be noted that the division of modules in the embodiment of the present invention is schematic, and is only a logical function division, and there may be another division manner in actual implementation.

Fig. 6 shows a possible structure of the BRAS provided in the above embodiments. As shown in FIG. 6 , the BRAS 600 includes: a receiving module 601 and an address control module 602 .

Wherein, the receiving module 601 is configured to receive a message or request sent by a user terminal, for example, the receiving module 601 may be configured to receive an offline message or an online request sent by a first user terminal. For example, the receiving module 601 is used to support the BRAS 600 to execute S202, S205 and S302 in the above embodiments, and/or other processes for the technology described herein.

The address control module 602 is configured to make unused IP addresses idle, and put the idle IP addresses into the idle address set; for example, the address control module 602 can be configured to receive the first user terminal from the receiving module 601 The offline message sent starts, and after a preset grace time, put the first IP address into the free address set. For example, the address control module 602 is used to support the BRAS 600 to execute S206 in the above embodiment.

Further, the BRAS provided in the foregoing embodiments may further include: an allocation module 603 and a switching module 604 .

Wherein, the allocation module 603 is configured to determine the first IP address from the idle address set, and allocate the idle IP address to the user terminal that initiates the online request; After receiving the online request of the second user terminal, the first IP address is determined from the idle address set, and the second IP address in the idle address set is allocated to the second user terminal. For example, the allocating module 603 is used to support the BRAS 600 to execute S203 and S303 in the above embodiments, and/or other processes for the technologies described herein.

The switching module 604 is used to switch the IP address used by the user terminal from the idle state to the used state; for example, the switching module 604 is used to assign the second IP address in the free address set to the second user terminal in the allocation module 603 Afterwards, the second IP address is switched from the idle state to the used state.

Further, the above-mentioned BRAS may further include a sending module, which is used for the above-mentioned receiving module 601 to receive the online request sent by the user terminal to the BRAS, and after the above-mentioned allocation module 603 assigns an IP address to the user equipment, send the online request to the user terminal Information such as the response to the request is used to indicate that the BRAS has successfully allocated the IP address for the user terminal.

Further, the above-mentioned BRAS may also include a storage module, which can be used to store the IP address in the above-mentioned embodiment of the invention, for example, the storage module can be used to store the idle state of the IP address in the above-mentioned embodiment of the invention. A collection of addresses.

In the case of using an integrated module, the above-mentioned receiving module 601 and sending module may be integrated into one communication module, which may be a communication interface, a transceiver circuit, or a transceiver. The above-mentioned address control module 602, the above-mentioned distribution module 603 and the above-mentioned switching module 604 can be integrated into one processing module, and this processing module can be a processor or a controller, such as a central processing unit (English: Central Processing Unit, referred to as: CPU), general-purpose processor, digital signal processor (English: Digital Signal Processor, referred to as: DSP), application-specific integrated circuit (English: Application-Specific Integrated Circuit, referred to as: ASIC), field programmable gate array (English: Field Programmable Gate Array, referred to as: FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processing module can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and the like. The storage module may be a memory.

When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the BRAS provided in this embodiment of the present invention may be the BRAS 700 shown in FIG. 7 .

As shown in FIG. 7 , the BRAS 700 includes: a processor 701 , a communication interface 702 , a memory 703 and a bus 704 . Wherein, the processor 701 , the communication interface 702 , and the memory 703 are connected to each other through a bus 704 . Among them, the bus 704 can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 7 , but it does not mean that there is only one bus or one type of bus.

The embodiment of the present invention also provides a computer storage medium, the computer storage medium stores computer program codes, the computer program codes include instructions, and when the processor 701 of the BRAS 700 executes the instructions, the BRAS 700 executes the steps in the above embodiments. The relevant method steps are to interact with the user terminal to realize the allocation of the IP address for the user terminal.

The detailed description of each module or module in the BRAS provided by the embodiment of the present invention and the technical effect brought by each functional module after performing the relevant method steps in the above embodiment can refer to the relevant description in the method embodiment of the present invention, here No longer.

The steps of the methods or algorithms described in conjunction with the embodiments of the present invention may be implemented in the form of hardware, or may be implemented in the form of a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in random access memory (English: Random Access Memory, abbreviated as RAM), flash memory, read-only memory (English: Read Only Memory, abbreviated: ROM), and Erasable programmable read-only memory (English: Erasable Programmable ROM, referred to as: EPROM), electrically erasable programmable read-only memory (English: Electrically EPROM, referred to as: EEPROM), registers, hard disks, mobile hard disks, CD-ROMs (English: CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be a component of the processor. Certainly, the processor and the storage medium may also exist in the core network interface device as discrete components.

Those skilled in the art should be aware that in the above one or more specific embodiments, the functions described in the present invention may be implemented by hardware, software, firmware or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above specific implementation manners have further described the purpose, technical solutions and beneficial effects of the embodiments of the present invention in detail. It can be understood that the above are only specific implementation modes of the present invention, and are not used to limit the protection of the embodiments of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present invention shall be included in the protection scope of the embodiments of the present invention.

Claims (11)

1. a kind of Protocol IP address management method interconnected between network, which is characterized in that including：

Broadband Remote Access Server BRAS receives the offline message that the first user terminal is sent；

The BRAS is since the BRAS receives the offline message that first user terminal is sent, in preset time allowance Afterwards, the first IP address is put into free address set, first IP address is the BRAS on first user terminal It is the IP address of first user terminal distribution during line, the IP address in the free address set is reached the standard grade for BRAS User terminal distributes IP address.

2. according to the method described in claim 1, it is characterized in that, receive what first user terminal was sent in the BRAS After offline message, the method further includes：

The BRAS discharges first IP address, so that first IP address is in idle condition.

3. method according to claim 1 or 2, which is characterized in that the method further includes：

The BRAS is after the request of reaching the standard grade of second user terminal is received, by the second IP address in the free address set Distribute to the second user terminal；

Second IP address is switched to use state by the BRAS by idle state；

Wherein, second IP address is identical with first IP address or second IP address with the first IP Location is different.

It is 4. described according to the method described in claim 1, it is characterized in that, the free address collection is combined into free address queue It is that the user terminal reached the standard grade distributes IP address that IP address in free address queue, which is used for BRAS according to the principle of first in first out,.

5. according to the method described in claim 1, it is characterized in that, receive the offline message of the first user terminal transmission in BRAS Before, the method further includes：

The BRAS receives the request of reaching the standard grade of first user terminal；

The BRAS determines first IP address from the free address set, and first IP address is distributed to institute State the first user terminal.

6. a kind of Broadband Remote Access Server BRAS, which is characterized in that including：

Receiving module, for receiving the offline message that the first user terminal is sent；

Address control module, for since the receiving module receives the offline message that first user terminal is sent, After preset time allowance, the first IP address is put into free address set, first IP address is the BRAS described It is the IP address of first user terminal distribution when first user terminal is reached the standard grade, the IP address in the free address set is used It is that the user terminal reached the standard grade distributes IP address in BRAS.

7. BRAS according to claim 6, which is characterized in that described address control module is additionally operable in the reception mould After block receives the offline message that first user terminal is sent, first IP address is discharged, so that the first IP Location is in idle condition.

8. the BRAS according to claim 6 or 7, which is characterized in that the receiving module is additionally operable to receive second user end The request of reaching the standard grade at end；

The BRAS, further includes：

Distribution module is additionally operable to after the receiving module receives the request of reaching the standard grade of second user terminal, from it is described idly Second IP address is determined in the set of location, and the second IP address in the free address set is distributed to described second and is used Family terminal；

Handover module, for second IP address to be switched to use state by idle state；

Wherein, second IP address is identical with first IP address or second IP address with the first IP Location is different；It is the user terminal distribution IP that reaches the standard grade that IP address in the free address set, which is specifically used for the distribution module, Location.

9. BRAS according to claim 6, which is characterized in that the free address collection is combined into free address queue, described It is that the user terminal reached the standard grade distributes that IP address in free address queue, which is used for the distribution module according to the principle of first in first out, IP address.

10. BRAS according to claim 6, which is characterized in that

The receiving module is additionally operable to before the offline message that first user terminal is sent is received, and receives described first The request of reaching the standard grade of user terminal；

Distribution module, for receive first user terminal in the receiving module request of reaching the standard grade after, from the free time First IP address is determined in address set, and first IP address is distributed into first user terminal.

11. a kind of BRAS, which is characterized in that including：Processor, memory, bus and communication interface, it is the processor, described Memory is connected with the communication interface by the bus；

The memory is for storing computer program code, and the computer program code includes instruction, when the processor When performing described instruction, the BRAS performs the IP address management method as any one of claim 1-5.