KR20040071364A - Multiple IP address processing apparatus and method using one physical LAN port in M-DSLAM - Google Patents

Abstract

PURPOSE: An apparatus and a method for processing multiple IP addresses by using a single LAN interface in a multi-DSLAM(Digital Subscriber Line Access Multiplexer) are provided to operate a system only with one external LAN interface mounted in a BIU(Broadband Interface Unit) while maintaining an original function without changing an MCU(Main Control Unit). CONSTITUTION: An LIU(LAN Interface Unit) receives IP packets through a LAN(S110). The LIU determines whether a destination IP address of the received IP packet is an IP address of an MCU(S112). If the destination IP address is an IP address of the MCU, the LIU routes the IP packet to a logical LAN interface of a BIU having a private IP address, the next home address, with reference to an internal routing table(S114,S116). The logical LAN interface of the BIU transmits an IP packet to an ATM cell converting/inversely converting unit(S118). The ATM cell converting/inversely converting unit converts the IP packet into an ATM cell and transmits it to an ATM cell converting/inversely converting unit of the MCU(S120). The ATM cell converting/inversely converting unit of the MCU converts the received ATM cell into an IP packet and transmits it to a logical LAN interface of the MCU(S122). The logical LAN interface of the MCU transmits the received IP packet to an MCU processing module to allow the MCU processing module to process the IP packet(S124).

Description

Multiple IP address processing apparatus and method using one physical LAN port in M-DSLAM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Multi DSLAM, and more particularly, to an apparatus and method for processing a plurality of IP addresses using a single LAN interface by providing an ATM communication between processors having a logical LAN interface therein.

In general, a digital subscriber line (DSL: xDSL) is used to provide a bidirectional broadband high-speed data service to a home or business through a conventional copper telephone line, that is, a twisted wire pair drop cable. Means the transmission method.

There are a number of variants in DSL, which are abbreviated as Asymmetric Digital Subscriber Line (ADSL), and High Bit-rate Digital Subscriber Line (HDSL). For example, symmetric high speed digital subscriber line (SHDSL), and very high data rate digital subscriber line (VDSL). These are collectively called xDSL.

In general, a system for an ADSL service is located in an access node of an access network such as an ATM network and a public switched telephone network (PSTN), which performs subscriber line aggregation. Multiplexor (hereinafter referred to as DSLAM) system, a network management device (NMS: NMS) that manages the DSLAM system, and located at the end of the subscriber area, perform data transmission / reception interface functions between the DSLAM system and the subscriber. The ADSL subscriber station (ATU-R: ADSL Transmission Unit-Receiver, hereinafter abbreviated as ATU-R) and the DSLAM system and the ATU-R are located between the ADSL subscriber station transmitting and receiving device, It consists of a splitter that filters / integrates low frequency components for the internet. By connecting a service network and a subscriber, an ADSL service such as an Internet service is provided to a subscriber along with a plain old telephone service (POTS).

At this time, the DSLAM system receives the data transmitted from the ATM network through the ATM network access port using the ATM network as the backbone network, extracts the ATM cell from the received data, and performs ATM cell processing according to the information. In addition, it modulates into analog signal and transmits to ATU-R through telephone line and vice versa.

However, such a conventional DSLAM system has some problems for accommodating the demands of the changing direction and prospect of broadband high-speed data service.

First, it is difficult to accommodate all the various services that have increased rapidly in recent years.

In particular, in recent years, as well as the existing Internet services, interactive services through video such as video on demand (VoD), video conferencing, video medical treatment, and voice over Internet (VoIP) Voice services based on Protocol (hereinafter referred to as VoIP) are required.

However, providing these services requires various accommodating units and large data processing capacity to accommodate them, and the conventional DSLAM system provides subscribers due to the limitation of single ATM cell bus capacity and lack of accommodating units. There is a problem that is practically impossible to provide various services such as VoD, VoIP, etc. in addition to the Internet service through one ISP.

Second, the conventional DSLAM system is configured to be connected to a single ISP service network and STM-1 (STM-1: Synchronous Transfer Module Level-1, hereinafter referred to as STM-1) data through an ATM network. Since the flexibility of the multiple ISP service is not available for the connection of multiple ISPs, the DSLAM system has a problem of low port density and low shelf scalability.

Therefore, as the number of subscribers in a dense residential area increases, the number of DSLAM systems to be installed also increases, which causes an inevitable increase in the area occupied by the system in the area.

Therefore, there has been an urgent need to develop an M-DSLAM system that supports a large capacity of data processing and various receiving units so as to interoperate with a large number of ISPs and accommodate various services.

Invented in this background, it is equipped with a variety of service accommodation units and a large number of data buses capable of supporting a large capacity, and its structure is flexible and excellent in scalability, and is capable of accommodating a large capacity and various services (M-DSLAM: Multi DSLAM, hereinafter abbreviated as M-DSLAM) system was provided.

FIG. 1 is a conceptual diagram illustrating an M-DSLAM system in which a Broadband Interface Unit (BIU: 42 is abbreviated 42) having a built-in B-RAS function.

Here, B-RAS (Broadband Remote Access Systems) manages and controls all subscribers using the Internet using ADSL, Cable, and Wireless, and works with various application server groups to authenticate and authorize. It refers to a system that is central to collective subscriber management activities such as accounting and accounting.

As shown, the general M-DSLAM system 40 has a Broadband Interface Unit (BIU: Broadband) having a LAN Interface Unit (LIU) 42-1 connected to the Internet 20 via a LAN. Interface Unit) and an ADSL Terminal Unit (ATU: ADSL Terminal Unit, hereinafter abbreviated as ATU) that receives an ATM cell transmitted from the BIU 42, converts it into an analog signal, and then transmits it to the subscriber 60 through a subscriber access port. 43), SHDSL Terminal Unit (STU: SHDSL Terminal Unit, hereinafter STU, 44), VDSL Terminal Unit (VTU: VDSL Terminal Unit, hereinafter abbreviated VTU, 45), LAN Terminal Unit (LTU: LAN Terminal Unit, Hereinafter, the LTU is abbreviated 46, and the main control unit (MCU) for controlling the interaction and data flow of the above-described units 42, 43, 44, 45, 46 in conjunction with the DSLAM management system 50. , Hereinafter referred to as MCU, 41).

The MCU 41 is provided with an SNMP agent for a system management function, and the provided SNMP agent performs a system management function by exchanging a message with the NMS 50.

In order to perform the management function by the SNMP agent, the MCU 41 needs to maintain a connection with the NMS 50 through the Internet 20. For this purpose, an IP address is allocated and managed. A separate physical LAN interface unit (LIU: LIU) 41-1 is provided.

Next, the BIU 42 receives the ATM cell type data from the subscriber, processes the subscriber cell access protocol, converts the data into IP packets, and delivers the data to the Internet 20. A separate IP address is also assigned to the 42, and a separate LIU 42-1 is provided for this purpose.

As such, in the conventional M-DSLAM, a separate IP address is allocated for processing functions of the MCU and the BIU, and there is a separate physical LIU connected to the outside. Therefore, there is a problem that waste of physical LIU is severe because one M-DSLAM exists but two types of physical LIUs are connected to the Internet.

In order to solve this problem, the BIU handles the functions handled by the MCU, but there is a problem in that the existing M-DSLAM system needs to be significantly modified.

Accordingly, the present invention has been made to solve the above problems, by implementing a logical LAN interface therein and providing ATM communication between processors, using a single LAN interface without a separate physical LAN interface unit It is an object of the present invention to provide a plurality of IP address processing apparatuses and a method using a single LAN interface in a multi-DRAM for enabling processing of IP addresses.

1 is a conceptual diagram illustrating an M-DSLAM system in which a broadband interface unit (BIU) having a built-in B-RAS function is generally installed.

2 is a block diagram of an M-DSLAM system equipped with a plurality of IP address processing apparatuses using a single LAN interface according to an embodiment of the present invention.

FIG. 3 is a block diagram of a plurality of IP address processing apparatuses using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

4 is a flowchart illustrating a process of processing an IP packet received from the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

5 is a flowchart illustrating a process of transmitting an IP packet to the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110: BIU 110-1, 210: LIU

120: MCU 220: IP Router

230: BIU processing module 240, 280: logical LAN interface

250, 300: ATM cell converter / inverse converter 260, 270: ATM cell router

290: MCU processing module

The present invention for achieving the above object, by using a first logical LAN interface to receive and process the IP packet whose destination IP address is the destination address through the internal communication bus, the assigned public IP address A main control unit generating an IP packet having a source address and transmitting the generated IP packet to an internal communication bus through the first logical LAN interface; And receiving an IP packet having an IP address assigned to itself or an IP address assigned to the main control unit from the LAN through a physical LAN interface unit, and wherein the IP address of the main control unit is the destination address of the received IP packets. The packet is transmitted to the main control unit through the second logical LAN interface to which a private IP address is assigned and the internal communication bus, and the IP packet transmitted to the internal communication bus by the main control unit is received on the second logical LAN interface to receive the physical message. It characterized in that it comprises a broadband interface unit for transmitting to the LAN via the in-lan interface.

In addition, the present invention includes a first step of receiving, by the physical LAN interface unit of the broadband interface unit an IP packet whose destination address is the IP address assigned by the broadband interface unit and the main control unit; The second logical LAN interface of the main control part via the internal communication bus and the first logical LAN interface of the broadband interface unit among the IP packets received by the physical LAN interface unit, wherein the IP address of the main control part is a destination address. A second step of transmitting to a computer for processing; The second logical LAN interface is a third step of transmitting the IP packet generated by the main controller via the internal communication bus to the first logical LAN interface; And a fourth step in which the first logical LAN interface transmits the IP packet received from the main controller to the physical LAN interface to be transmitted to the LAN.

Now, a preferred embodiment of the present invention will be described in detail with reference to the drawings of FIG. 2.

2 is a block diagram of an M-DSLAM system equipped with a plurality of IP address processing apparatuses using a single LAN interface according to an embodiment of the present invention.

Referring to the drawings, the M-DSLAM system 100 equipped with a plurality of IP address processing apparatuses using a single LAN interface is referred to as a LAN Interface Unit (LIU: LIU) for accessing the Internet 20. 110-1, a broadband interface for converting an ATM cell into an Ethernet packet and transmitting it to the Internet 20, and converting an Ethernet packet into an ATM cell and transmitting it to a plurality of xDSL service units 140 to 170. Unit (BIU: Broadband Interface Unit, hereinafter abbreviated as BIU, 110), shelf shelf expansion unit (SIU: Subtending Interface Unit, hereinafter abbreviated as SIU, 130), and multiple xDSL service units (140-170). I.e., ATU 140, LAN Terminal Unit (LTU: abbreviated LTU, 170), SHDSL Terminal Unit (STU: abbreviated STU, 150), VDSL terminal unit (VTU: VDSL Terminal Unit, hereinafter abbreviated as VTU, 160) Units (110 to 170) consists of the MCU (120) that performs the overall control such interaction, maintenance, and the flow of data.

The M-DSLAM system 100 is connected to the subscriber extension shelf 200 via an E1 / T1, DS3 or STM-1 / 4 interface, thereby connecting the ATM network 10 to the connected subscriber extension shelf 200. In addition, the processing capacity and the subscriber access port can be expanded, thereby greatly increasing the number of serviceable subscribers 60.

In addition, the M-DSLAM system 100 is directly connected to a network management system (NMS) 50 or the like using a LAN interface 110-1 provided in the BIU 110 via a 10 / 100Base-T interface. It is possible to operate the system and convert the ethernet frame to ATM cell and perform the reverse function through BIU internal function to provide subscribers 60 with various xDSL based services such as VoD, Internet, video conferencing and video medical treatment.

Here, NMS (NMS) 50 refers to a management system that enables monitoring, planning, and analysis by establishing a central monitoring system for all devices on the NMS network. It aims to collect and manage the overall information by storing relevant data so that it can be used immediately when needed.

The NMS 50 uses network management protocols such as Simple Network Management Protocol (SNMP), Common Management Information Protocol (CMIP), and Remote Network Monitoring (RMON), which is used to manage traffic.

The SNMP system consists of an SNMP manager running on the NMS 50, an SNMP agent running on a management object, and a management information base (MIB).

In case of SNMP, it is installed in UDP (User Datagram Protocol) operating in IP (Internet Protocol), that is, connection type transport protocol. Therefore, in order to perform SNMP communication, an IP address is used for both SNMP agent running in NMS manager and management object. (Address) is required.

Meanwhile, in the present invention, as shown in the figure, the BIU 110 has a physical LIU 110-1 to be connected to the Internet through a LAN, but the MCU 120 is not provided with a physical LIU unlike the prior art. It is equipped with a logical LAN interface.

Here, the physical LIU 110-1 refers to a real LAN interface unit that operates on an Ethernet like a LAN card. The logical LAN interface is not a LAN card, which is a physical medium, but operates using a LAN card. Like a virtual LAN interface, the TCP / IP protocol stack runs on any physical medium.

In addition, an ATM virtual channel is used as a communication channel between the BIU 110 and the MCU 120 to form a connection between the two.

In addition, an interface function between the ATM virtual channel and the TCP / IP protocol stack was added to each of the BIU 110 and the MCU 120 to operate the TCP / IP protocol stack on the ATM virtual channel. At this time, one logical LAN interface is formed for one ATM virtual channel.

It is not necessarily an ATM virtual channel for data transmission and reception between the BIU 110 and the MCU 120. What is needed is a path for transmitting and receiving data and forming a logical LAN interface to enable TCP / IP processing using the path. will be.

The physical LIU 110-1 of the BIU 110 adds a proxy ARP function in addition to the general LAN interface function to process packets destined for the IP address of the BIU 110 as well as the IP address of the MCU 120. It can also handle packets destined for the destination.

That is, the physical LIU 110-1 of the BIU 110 receives and processes the packet when the packet destined for the IP address of the MCU 120 is received using the proxy ARP function.

In this case, the proxy ARP function should be added separately from the function provided by the general operating system (OS) or the function not provided by the OS.

The BIU 110 manages a separate internal IP routing table not visible from the outside to transmit the received packet to the MCU 120 when receiving the packet destined for the IP address of the MCU 120.

That is, the BIU 110 adds an arbitrary private IP address to a logical LAN interface connected to the MCU 120 to add routing information related to the given private IP address to the IP routing table.

Accordingly, when the BIU 110 receives the packet whose destination IP address is the IP address of the MCU 120, the BIU 110 refers to the IP routing table and routes the IP packet to the logical LAN interface to which the private IP address is assigned.

As such, the BIU 110 assigns a random private IP address to the logical LAN interface connected to the MCU 120 and receives a packet in which the destination IP address is the IP address of the MCU 120, thereby assigning the logical LAN to which the private IP address is assigned. Route IP packets to the interface.

Meanwhile, the MCU 120 does not have a physical LAN interface but has a logical LAN interface for processing IP packets received through the BIU 110 through the Internet 20.

The MCU 120 receives and processes the data from the BIU 110 through a logical LAN interface having data transmitted through the ATM virtual channel.

In addition, since the MCU 120 does not have a physical LAN interface to transmit the IP packet, the MCU 120 transmits data to the logical LAN interface of the BIU 110 through the logical LAN interface.

Then, the BIU 110 converts the IP packet received through the logical LAN interface into an IP packet through the physical LIU 110-1 and transmits the converted IP packet.

FIG. 3 is a block diagram of a plurality of IP address processing apparatuses using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

Referring to the drawings, a plurality of IP address processing apparatus using a single LAN interface in a multi-multi DRAM according to an embodiment of the present invention, the LIU (210), IP router 220, BIU processing built in the BIU Module 230, logical LAN interface 240, ATM cell converter / inverse converter 250, ATM cell router 260, and ATM cell router 270 embedded in MCU, logical LAN interface 280 , The MCU processing module 290 and the ATM cell conversion / inverse conversion unit 300 are provided.

The provided LIU 210 is assigned a public IP address for BIU function processing, and has a proxy ARP function for receiving an IP packet having the MCU's IP address as a destination address.

As such, when the proxy ARP function is set, the LIU 210 can receive the IP packet transmitted from the NMS or the like using the MCU's IP address as the destination address.

In addition, the LIU 210 may transmit IP packets received from the BIU processing module 230 and the logical LAN interface 240 of the BIU to the NMS through the LAN.

Next, the IP router 220 of the BIU manages an IP route entry to the MCU through the logical LAN interface 240 of the BIU to process an IP packet transmitted to the MCU in an IP routing table.

For example, the IP router 220 of the BIU manages an IP routing table as shown in Table 1 when the IP address of the MCU is 165.213.96.237 and the private IP address of the logical LAN interface of the BIU is 12.1.1.1.

Destination address Netmask Next hop address 165.213.96.237 255.255.255.0 12.1.1.1 ... ... ...

Accordingly, when an IP packet having a destination address of 165.213.96.237 is received, the IP router 220 of the BIU transmits the received IP packet to the logical LAN interface 240 of the BIU having the private IP address of 12.1.1.1.

Of course, the IP router 220 of the BIU transmits the IP packet having the BIU's IP address as a destination address to the BIU processing module 230 to process the IP packet.

In addition, the IP router 220 of the BIU receives the received IP packet when the IP packet having the public IP address of the BIU or the MCU as the source IP address is received from the BIU processing module 230 or the logical LAN interface 240 of the BIU. The LIU 210 transmits the data to the NMS.

On the other hand, the logical LAN interface 240 of the BIU is assigned a private IP address in order to process a packet whose destination address is the IP address of the MCU.

Therefore, it is possible to receive and process the IP packet through the IP router 220 of the BIU from the LIU (210).

In addition, the logical LAN interface 240 of the BIU receives the LIU 210 using the IP router 220 of the BIU when an IP packet having the MCU's IP address as the source IP address is received from the logical LAN interface 280 of the MCU. ) To be sent to NMS. For this purpose, the logical LAN interface 240 of the BIU must manage a routing table using the IP address of the LIU 210 as the default gateway.

The ATM cell converter / inverse converter 250 of the BIU converts the IP packet received from the logical LAN interface 240 of the BIU into an ATM cell and outputs the ATM packet to the ATM cell router 260 of the BIU, through the ATM virtual channel. The ATM cell received from the cell router 270 of the MCU is inversely converted into an IP packet and transmitted to the logical LAN interface 240 of the BIU.

Next, the ATM cell router 260 of the BIU transmits the ATM cell received through the ATM cell converter / inverse converter 250 of the BIU to the ATM cell converter / inverse converter of the MCU through an ATM virtual channel.

Meanwhile, the ATM cell router 270 of the MCU receives an ATM virtual channel from an ATM cell received from the MCU processing module 290 through the logical LAN interface 280 of the MCU and the ATM cell converter / inverse converter 300 of the MCU. It transmits to the ATM conversion / inverse conversion unit 250 of the BIU.

In addition, the ATM cell conversion / reverse conversion unit 300 of the MCU receives the ATM cell from the ATM cell router 260 of the BIU, converts the ATM cell into an IP packet, and outputs the output to the logical LAN interface 280 of the MCU. The IP packet received from the LAN interface 280 is converted into an ATM cell and transmitted to the ATM cell converter / inverse converter 250 of the BIU via the ATM cell router 270 and the ATM virtual channel.

Next, the logical LAN interface 280 of the MCU is provided to form an ATM virtual channel with the logical LAN interface 240 of the BIU, and a public IP address is assigned to process the function of the MCU.

The logical LAN interface 280 of the MCU receives the IP packet from the ATM cell conversion / inverse conversion unit 300 of the MCU and transmits the IP packet to the MCU processing module 290, and receives the IP packet from the MCU processing module 290. ATM cell conversion / inverse conversion unit 300 of the transmission.

4 is a flowchart illustrating a process of processing an IP packet received from the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

Referring to the drawings, a process of processing an IP packet received from the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention, first, the LIU receives its IP address from the NMS through a LAN. The IP packet serving as the destination address and the IP packet serving as the destination address are received using the proxy ARP function (step S110).

Next, it is determined whether the destination IP address of the received IP packet is the IP address of the MCU (step S112).

If it is determined that the destination IP address of the received IP packet is its own IP packet, the BIU processing module processes the received IP packet (step 126).

As a result of determination, if the destination address of the IP packet received by the LIU is the destination address of the MCU (step S114), the IP packet is routed to the logical LAN interface of the BIU having the private IP address as the next hop address (step S114). Step S116).

Next, the logical LAN interface of the BIU receiving the IP packet transmits the IP packet to the ATM cell conversion / inverse conversion unit of the BIU (step S118), and the ATM cell conversion / inverse conversion unit of the BIU receiving the IP packet transmits the IP packet to the ATM. The cell is converted to the cell and transmitted to the ATM cell converter / inverse converter of the MCU using the ATM virtual channel through the cell router (step S120).

Thereafter, the ATM cell conversion / inverse conversion unit in the MCU converts the received ATM cell into an IP packet and transmits it to the logical LAN interface of the MCU (step S122).

Next, the logical LAN interface of the MCU transmits the received IP packet to the MCU processing module so that the MCU processing module processes the IP packet (step S124).

5 is a flowchart illustrating a process of transmitting an IP packet to the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention.

Referring to the drawings, the process of transmitting an IP packet to the Internet using a single LAN interface in a multi-DRAM according to an embodiment of the present invention is performed first if the MCU has data to be transmitted to the NMS through the Internet. And transmits to the logical LAN interface of the MCU (step S210).

Next, the logical LAN interface of the MCU transmits the IP packet to the ATM cell conversion / inverse conversion unit of the MCU (step S212).

Upon receipt of the IP packet from the logical LAN interface of the MCU, the ATM cell conversion / inverse conversion unit of the MCU converts the IP packet into an ATM cell and transmits the IP packet to the ATM cell conversion / inverse conversion unit of the BIU using the ATM virtual channel (step S214).

The ATM cell converter / inverse converter of the BIU converts the received ATM cell into an IP packet and transmits it to the logical LAN interface of the BIU (step S216).

The logical LAN interface of the BIU then sends an IP packet to the LIU set as the default gateway with reference to the internal routing table (step S218).

Thereafter, the LIU transmits an IP packet to the NMS or the like using the LAN (step S220).

Although the present invention has been described in detail with reference to preferred embodiments, the scope of the present invention is not limited to the specific embodiments, and should be interpreted by the appended claims.

According to the present invention as described above, there is an effect that the system can be operated by only one external LAN interface mounted in the BIU while maintaining the original function without changing the MCU in the multi-DRAM.

In addition, according to the present invention, it is possible to reduce the physical LAN interface mounted on the multi-DRAM to enable the low-cost multi-DRAM implementation in terms of cost.

Claims (8)

Receives and processes an IP packet whose destination IP address is a destination address using an internal communication bus using a first logical LAN interface, and generates an IP packet whose source IP address is a source address. 1 main controller for transmitting to the internal communication bus via the logical LAN interface; And Receives an IP packet assigned to itself from the LAN through a physical LAN interface unit or an IP packet whose IP address assigned to the main control unit is a destination address, and an IP packet whose IP address is the destination address among the received IP packets. Is transmitted to the main control unit using a second logical LAN interface to which a private IP address is assigned and an internal communication bus, and the IP packet received by the main control unit to an internal communication bus is received on the second logical LAN interface to receive the physical message. A plurality of IP address processing apparatus using a single LAN interface in a multi-DRAM including a broadband interface unit for transmitting to the LAN through the LAN interface. The method of claim 1, The internal communication bus is a plurality of IP address processing apparatus using a single LAN interface in a multi-DRAM RAM, characterized in that the ATM cell bus. The method of claim 2, The main fisherman, A processing unit for receiving and processing an IP packet having the assigned IP address as a destination, and generating and outputting an IP packet having the assigned IP address as a source address; A first logical LAN interface for transmitting the received IP packet to the processing unit and for transmitting the IP packet received from the processing unit to the broadband interface unit through an ATM virtual channel; And ATM cell IP packet received from the first logical LAN interface is transmitted to the broadband interface unit through an ATM virtual channel, and ATM cellized IP packet received from the broadband interface unit is restored to an IP packet and the first packet is recovered. A plurality of IP address processing apparatuses using a single LAN interface in a multi-DRAM including a first ATM cell conversion / inverse conversion unit for outputting to a logical LAN interface. The method of claim 2 or 3, The broadband interface unit, Receiving an IP packet assigned by the broadband interface unit and an IP address assigned by the main control unit as a destination address, routing an IP packet whose IP address is a destination address to the second logical LAN interface, A physical LAN interface unit for outputting an IP packet received from the second logical LAN interface to a LAN; ATM cell IP packet received from the second logical LAN interface is transmitted to the main control unit using an ATM virtual channel, and the ATM cellized IP packet received from the main control unit is recovered to the second logical LAN interface. Outputting a second ATM cell conversion / inverse conversion unit; And A second logical for transmitting the IP packet received from the physical LAN interface unit to the second ATM cell converter / inverse converter and transmitting the IP packet received from the ATM cell converter / inverse converter to the physical LAN interface unit Multiple IP address processing apparatus using a single LAN interface in a multi-DRAM including a LAN interface. A first step of receiving, by the physical LAN interface unit of the broadband interface unit, an IP packet whose destination address is the IP address assigned by the broadband interface unit and the main controller; The second logical LAN interface of the main control part via the internal communication bus and the first logical LAN interface of the broadband interface unit among the IP packets received by the physical LAN interface unit, wherein the IP address of the main control part is a destination address. A second step of transmitting to a computer for processing; The second logical LAN interface is a third step of transmitting the IP packet generated by the main controller via the internal communication bus to the first logical LAN interface; And And a fourth step in which the first logical LAN interface transmits the IP packet received from the main controller to the physical LAN interface to be transmitted to the LAN. How addresses are handled The method of claim 5, wherein The second step, The physical LAN interface may determine whether the destination IP address of the received IP packet is the main controller; A step 2-2 of routing the IP packet to the first logical LAN interface with reference to an internal routing table if the destination IP address of the received IP packet is a destination address of the main controller unit as a result of the determination in step 2-1; The first logical LAN interface is configured to transmit an IP packet to the second logical LAN interface of the main controller through an internal communication bus; And And the second logical LAN interface includes steps 2-4 for transmitting an IP packet to a processing unit to process the plurality of IP addresses using a single LAN interface. The method according to claim 5 or 6, The third step, Step 3-1 of the main control unit generating an IP packet and transmitting the IP packet to the second logical LAN interface; And 3-2, wherein the second logical LAN interface transmits to the first logical LAN interface through an internal communication bus. The method according to claim 5 or 6, The fourth step, A first step of transmitting the IP packet to the physical LAN interface unit configured as a default gateway by referring to an internal routing table; And And the physical LAN interface unit comprises a step 4-2 of transmitting an IP packet to a LAN connected to the Internet.