KR20010056740A - Multiprotocol Supportable ADSL Router And Packet Send/Receive Method In That Router - Google Patents

Abstract

PURPOSE: An ADSL router which supports multiple protocols and a packet transmission and receiving method of the router are provided to initialize a PPPoA protocol and an IPoA protocol, analyze a connection information of a transmission packet and an LLC header of a receiving packet, determine a protocol, store service type information which is capable of separate an ATM protocol module, a PPPoA protocol and an IPoA protocol which determine a protocol for a control request into a call control table and separate a call process and management of each protocol. CONSTITUTION: An ATM protocol module(26) includes a PPPoA module(26-1) which provides a call setting, data encapsulation and decapsulation function for an initial PPP connection, and an IPoA module(26-2) for performing a signal interface, server connection setting and maintenance function for an LLC encapsulation and decapsulation, connection management, call setting and release among the request for comments(RFC) 1577 and 1755 and 1483 recommended by the Internet Engineering Task force(IETF). The IPoA protocol is classified into an ATMARP module(23) of an application hierarchy and an IPoA module(26-2) of a high level device driver hierarchy. The ADSL router provides the IPoA protocol and PPPoA protocol. The PPPoA module(26-1) and the IPoA module(26-2) which provide each protocol use one physical port, and transmit and receive the packet using the set VC channel through the ATM signaling module(28).

Description

Multiprotocol Supportable ADSL Router And Packet Send / Receive Method In That Router}

The present invention relates to an Asymmetric Digital Subscriver Line (ADSL) router supporting a multi-protocol and a packet transmission / reception method of the router. In particular, the ADSL router implements both a PPPoA (PPP over ATM) protocol and an IP over ATM (IPoA) protocol. The present invention relates to an ADSL router that supports multiple protocols for transmitting and receiving packets in a corresponding protocol, and a method for transmitting and receiving packets of the router.

The conventional ADSL router provides only one of an IPoA (IP over ATM) protocol and a PPPP (APPPoA) protocol, and the protocol stack structure of the ADSL router according to this is shown in FIG. 1. 1A is a diagram showing a protocol stack of an ADSL router providing an IPoA protocol, and (B) is a diagram showing a protocol stack of an ADSL router providing a PPPoA protocol.

Here, the protocol stack of each ADSL router is composed of a device driver layer divided into an application layer, a high level device driver layer, and a low level device driver layer. The application layer is an IP module 11 that processes IP packets according to an Internet Protocol (IP) address, and an ARP that maps an IP address and a Media Access Control (MAC) address to process local area network (LAN) data. (Address Resolution Protocol) module 12 is included.

The device driver layer includes a LAN driver module 13 that performs LAN data processing, an Asynchronous Transfer Mode (ATM) driver module that performs a function of establishing and releasing a Virtual Channel (VC) connection and a packet through the VC. 15) and an ATM signaling module 16 for performing call processing and management corresponding to a protocol provided by the user, wherein the high-level device driver layer includes an IPoA module 14-1 according to a protocol provided by each ADSL router. Or PPPoA module 14-2, respectively.

As such, since the conventional ADSL router supports only one protocol, the corresponding ATM signaling module 16 provides only the call setup function without considering which protocol is required when the call setup request is received, and the corresponding ATM driver. The module 15 also forwards the received packet to the upper ATM protocol module, i.e., the IPoA module 14-1 or PPPoA module 14-2, without considering which protocol was registered by the ATM connection. do.

Therefore, conventionally, ADSL routers supporting protocols provided by the corresponding network must be distinguished and installed according to the communication network in which the ADSL router is installed, and in the communication network in which the IPoA protocol and the PPPoA protocol are mixed, the corresponding network must be duplexed. there was.

The present invention is to solve the problems as described above, the purpose is to implement the PPPoA protocol and IPoA protocol to support in one ADSL router, and to perform the call setup and release management for each protocol to the corresponding protocol By sending and receiving packets, the ADSL router can be installed regardless of the protocol used in the communication network.

Another object of the present invention is to support both the PPPoA protocol and the IPoA protocol in an ADSL router, so that an efficient and economical network can be configured without having to configure a communication network in which the protocol is mixed.

1 is a diagram illustrating a protocol stack structure of a conventional ADSL router.

2 is a diagram illustrating a protocol stack structure of an ADSL router according to the present invention.

3 is a flowchart illustrating an operation of transmitting an IP packet to a corresponding protocol in an ADSL router according to the present invention.

4 is a flowchart illustrating an operation of receiving an IP packet in a corresponding protocol in an ADSL router according to the present invention.

Explanation of symbols on the main parts of the drawings

21: IP module 22: ARP module

23: ATPARP Module 24: LSL Module

25: LAN driver module 26: ATM protocol module

26-1: PPPoA Module 26-2: IPoA Module

27: ATM driver module 28: ATM signaling module

A feature of the present invention for solving the above object is to perform the initialization of the PPPoA protocol and IPoA protocol, analyze the connection information of the transmission packet and the LLC header of the received packet to determine the protocol to be delivered and at the same time control request An ATM protocol module for determining a protocol to be forwarded; The present invention provides an SDL router that supports multiple protocols including an ATM signaling module that stores service type information that can distinguish PPPoA protocols and IPoA protocols in a call control table to distinguish and perform call processing and management of each protocol.

When the PPP connection is established with the ATM protocol module, the IP module registers routing information about the PPP port in the IP routing table and registers the IP information and the connection information of the PPP port in the ATMARP table of the ATMARP module. It further comprises.

Here, the ATM protocol module includes a PPPoA module for providing call setup and data encapsulation and recovery functions for an initial PPP connection; LLC encapsulation and restoration corresponding to Internet protocol definition, connection management, signal interface for call setup and release, and IPoA module for establishing and maintaining a connection with a server.

Another feature of the present invention includes the steps of initializing the IPPoA protocol by establishing a VC channel with an ATMARP server at the same time as initializing the PPPoA protocol by PPP access through the VC channel configured using signaling; Encapsulating an LLC packet of PPPoA or IPoA according to a next hop IP address and port of the IP packet and transmitting the encapsulated protocol through a VC channel; It analyzes the LLC header of the received packet and distinguishes whether it is a PPPoA packet or an IPoA packet and receives it with the corresponding protocol, and then restores the LLC header of the corresponding packet and forwards it to the next hop port. It is to provide a packet transmission and reception method of the DSL router.

The initializing of the protocol may include establishing a VC channel with a peer PPP using signaling to support the IPoA protocol; Initializing the PPPoA protocol by registering the routing information for the PPP port in the IP routing table and registering the IP information and the connection information in the ATMARP table; Establishing an VC channel with an ATMARP server to register IP address information and ATM address information in the ATMARP server and ATMARP table, and additionally registering static routing information for the IPoA port in the IP routing table to initialize the IPoA protocol. It is characterized by.

In the process of encapsulating the IP packet into an LLC header of PPPoA or IPoA and transmitting the protocol to a corresponding protocol through a VC channel, the next hop IP address and port required for IP packet transmission are retrieved by searching for information registered in an IP routing table. Determining; If the determined next hop port is an ATM port, checking an ATMARP table to determine whether there is registration information regarding the next hop IP address; Checking whether the registered VC channel is a VC channel connected to the opposite PPP when the registration information exists; In case of the VC channel connected to the other side PPP, the method includes encapsulating the IP packet into an LLC header for the PPP header and the PPPoA, and transmitting the packet over the VC channel.

Further, in the step of determining the next hop IP address and port necessary for transmitting the IP packet, if the next hop port is an Ethernet port, checking whether the registration information regarding the next hop IP address exists by searching an ARP table; ; If the registration information exists, transmitting the IP packet in an encapsulated Ethernet frame; And if the registration information does not exist, generating an ARP request packet including the next hop IP address and transmitting the packet in an encapsulated Ethernet frame, and whether the registration information regarding the next hop IP address exists. In the verifying step, generating an ATMARP request packet including the next hop IP address if there is no registration information; Encapsulating the generated ATMARP request packet into an LLC header for IPoA and transmitting the packet to the ATMARP server through the VC channel. When the ATMARP response packet is received from the ATMARP server, the VC channel is transmitted through signaling. Setting up; And encapsulating the currently waiting IP packet in the LLC header for the IPoA and transmitting it on the VC channel.

The method may further include: encapsulating the LLC VC channel with a PPP associated with the peer PPP, and encapsulating an LLC header for IPoA if the VC channel is associated with the peer PPP and transmitting the VC channel. It features.

Further, the process of restoring the LLC header of the received packet to the next hop port may include analyzing the header of the received packet to determine whether the packet is a PPPoA packet starting with the LLC header of the PPP or an IPoA packet starting with the LLC header of the IPoA. Confirming; Restoring the LLC header and the PPP header of the PPPoA packet when the packet is identified as a PPPoA packet to obtain an IP packet; And routing the IP packet to a next hop port.

Restoring the LLC header of the IPoA packet when the header of the received packet is determined to be an IPoA packet; Checking whether the recovered packet is an IP packet or an ATMARP packet; If it is confirmed as an IP packet, characterized in that it further comprises the step of routing the IP packet forwarded to the next hop port, the step of confirming whether the restored packet is an IPoA packet or ATMARP packet, if it is confirmed as an ATMARP packet Checking whether the ATMARP request packet is an ATMARP response packet; In the case of an ATMARP request packet, generating a corresponding ATMARP response packet, encapsulating it in an LLC header of an IPoA, and transmitting the packet to an ATMARP server through a corresponding VC channel; In the case of an ATMARP response packet, after registering an ATM address corresponding to the ATMARP table, the method may further include generating and transmitting a setup request message to the ATM signaling module.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

ADSL router according to the present invention provides both the IPoA protocol and PPPoA protocol, the protocol stack structure of the ADSL router for this purpose is as shown in Figure 2 attached to the application layer, link support layer, high-level device driver It consists of a device driver layer divided into a layer and a low level device driver layer.

The application layer is an IP module 21 for processing an IP packet according to an IP address, an ARP module 22 for mapping an IP address and a MAC address to process LAN data, and ATMARP, which is a part of IPoA protocol processing. ATMARP module 23 that performs table maintenance, ATMARP packet processing, and determines whether to send ATMARP request packets or forward IP packets by referring to the ATMARP table for all IP packets routed to the ATM port. It includes.

The link support layer includes a link support layer (LSL) module 24 for distinguishing packets transmitted and received between the application layer and the high level device driver layer.

The device driver layer performs a LAN driver module 25 that performs LAN data processing and functions of initialization and transmission / reception control of the PPPoA protocol and the IPoA protocol, but includes connection information of the transmitted packet and LLC (Logical) of the received packet. Link Protocol) and the ATM protocol module 26 which determines the protocol to be transmitted by analyzing the header, and determines the protocol to which the control request is transmitted, and performs the VC connection establishment and release function and data processing through the VC, ATM driver module 27 for transmitting and distributing packets through ATM protocol module 26 or ATM signaling module 28 and corresponding VC by managing connection information set and released in the table, and PPPoA protocol and IPoA protocol. Service type information that can distinguish call processing and management, but can distinguish corresponding protocol in interface with each protocol. Stored in a call control table to include the ATM signaling module 28 used for processing and managing the call.

The ATM protocol module 26 is a PPPoA module 26-1 that provides call setup, data encapsulation, and decapsulation for an initial PPP connection, and is established by the Internet Engineering Task Force (IETF). Among the Internet protocol definitions (Request for Comments (RFC) 1577 and 1755, 1483), an IPoA module (26) that encapsulates and restores LLCs, manages connections, signaling interfaces for establishing and releasing calls, and establishes and maintains connections with servers. -2).

Here, the IPoA protocol is divided into an ATMARP module 23 of the application layer and an IPoA module 26-2 of the high level device driver layer, and the ATMARP module 23 supports only the existing ARP function and the ATM connection. By managing the management function in the IPoA module 26-2, it is possible to interwork with the corresponding PPPoA protocol.

On the other hand, in order to forward a packet from the corresponding IP module 21 to the PPPoA module 26-1 through a predetermined PPP port, after a PPP connection is established with the corresponding PPPoA module 26-1, the PPP port in its own IP routing table. In addition to registering the routing information for the PPP port IP information and connection information to the ATMARP module 23 to be registered in the ATMARP table.

As such, the ADSL router according to the present invention provides both the IPoA protocol and the PPPoA protocol, and according to configuration settings, only one protocol may be performed or two protocols may be performed simultaneously.

The PPPoA module 26-1 and the IPoA module 26-2 providing each protocol use only one physical port and transmit and receive packets using the VC channel set up through the ATM signaling module 28. .

Referring to the protocol initialization operation of the ADSL router for this purpose, first, the ATM signaling module 28 is initialized, and when the Signaling ATM Adaptation Layer (SAAL) is up (UP) to the PPPoA module 26-1, the corresponding PPPoA module ( 26-1) sets up a VC channel using signaling to a PPP peer (PPP Peer) to support the IPoA protocol, and attempts a PPP connection through the corresponding channel.

At this time, if the PPP connection is successful, the routing information for the PPP port is registered in the IP routing table of the IP module 21, and the IP information and the connection information are registered in the ATMARP table of the ATMARP module 23. The information registered in each table is used to deliver IP packets delivered to the PPPoA module 26-1 through the corresponding PPP port.

Meanwhile, the IPoA module 26-2 of the corresponding ADSL router sets up the VC channel with the ATMARP server, registers its IP address information and ATM address information with the ATMARP server, and simultaneously registers the ATMARP table with the ATMARP module 23. After the ATMARP packet can be processed through the corresponding IPoA port, the static routing information for the IPoA port is additionally registered in the IP routing table of the IP module 21.

Here, since the PPP port of the PPPoA module 26-1 and the IPoA port of the IPoA module 26-2 use the same physical layer ATM port and IP address, the IP module 21 of the PPP routing and IPoA Do not manage routing information separately.

The IP packet transmission and reception operation through the ATM port of the ADSL router in the protocol initialization as described above is described in detail as follows.

First, the operation of transmitting the IP packet received from the IP module 21 to the corresponding protocol will be described with reference to FIG. 3.

When the IP module 21 wants to transmit an IP packet, the IP module 21 searches for information registered in the IP routing table to determine a next hop IP address and a port necessary for transmitting the IP packet (step S11). It is checked whether the hop port is an ATM port (step S12).

At this time, if the next hop port is an Ethernet port instead of an ATM port, the ARP module 22 searches for an ARP table managed and transmits the corresponding IP packet according to the existing LAN data processing method.

That is, by searching the corresponding ARP table (step S13), it is checked whether there is a registration information about the next hop IP address (step S14). In this case, if the registration information does not exist, the ARP including the next hop IP address is present. After generating a request packet (step S15), the packet is encapsulated to generate an Ethernet frame (steps S16 and S17). If the registration information exists, the packet is encapsulated to generate an Ethernet frame and sent. (Steps S16, S17).

By the way, when the next hop port is an ATM port in step S12, the ATMARP table managed by the ATMARP module is searched (step S18) to check whether there is registration information regarding the next hop IP address (step S19).

At this time, if there is registration information about the next hop IP address, it is checked whether the registered VC channel is the VC channel connected to the other side PPP (step S20), and if the VC channel connected to the other side PPP, that is, the PPP channel, the IP packet It is encapsulated in a PPP header (step S21), and again encapsulated in an LLC header for PPPoA (step S22), and then transmitted through the corresponding PPP channel, that is, the VC channel connected to the partner PPP (step S23).

However, in step S20, if it is not the VC channel connected to the counterpart PPP, after encapsulating the LLC header for the IPoA (step S25), the operation of step S23 transmitted through the corresponding VC channel is performed.

On the other hand, if there is no registration information on the next hop IP address in step S19, after generating an ATMARP request packet including the next hop IP address (step S24), the operation of step S25 encapsulating the LLC header for IPoA is performed. And transmits to the ATMARP server through the VC channel.

Thereafter, when the ATMARP response packet is received from the corresponding ATMARP server, the VC channel is established through signaling, and the currently waiting IP packet is encapsulated in the LLC header for the IPoA, and then transmitted through the configured VC channel.

On the other hand, if an ATMARP response packet is not received from the ATMARP server or an ARPNAK packet is received, the IP packet currently waiting is discarded.

Next, an operation of receiving the IP packet received from the corresponding ATM driver module 27 with the corresponding protocol will be described with reference to FIG. 4.

When the ATM driver module 27 receives the packet and delivers the packet to the ATM protocol module 26 (step S41), the ATM protocol module 26 analyzes the header of the received packet and starts with the LLC header of the PPP. By checking whether the packet is a PPPoA packet or an IPoA packet starting with the LLC header of the IPoA (step S42), it is determined whether to deliver to the PPPoA module 26-1 or to the IPoA module 26-2.

At this time, when the packet is identified as a PPPoA packet, that is, when the packet is identified as a PPPoA packet encapsulated by the LLC header of the PPPoA, the PPPoA module 26-1 of the ATM protocol module 26 restores the LLC header of the PPPoA packet. (Step S43), the recovered PPP packet is encapsulated in a PPP header, so that the PPP header is restored again to obtain an IP packet (step S44).

Subsequently, the PPPoA module delivers the IP packet obtained through two restorations to the IP module 21. Accordingly, the IP module 21 routes the received IP packet to the next hop port (step). S45).

On the other hand, when the corresponding packet is identified as an IPoA packet in step S42, that is, when it is confirmed as an IPoA packet encapsulated by an LLC header of the IPoA, the IPoA module 26-2 of the ATM protocol module 26 performs the LLC of the IPoA packet. After restoring the header (step S46), it is checked whether the packet thus obtained is an IP packet or an ATMARP packet (step S47).

At this time, if the corresponding packet is identified as an IP packet, the recovered IP packet is delivered to the IP module 21. Accordingly, the IP module 21 routes the received IP packet to the next hop port. In operation S45, if the corresponding packet is identified as an ATMARP packet, it is again checked whether it is an ATMARP request packet or an ATMARP response packet (step S48).

If the corresponding ATMARP packet is an ATMARP request packet, a corresponding ATMARP response packet is generated (step S49), encapsulated into an LLC header of the IPoA (step S50), and the VC corresponding to the ATMARP server side that has transmitted the ATMARP request packet. An ATMARP response packet is transmitted through the channel (step S51). If the ATMARP packet is an ATMARP response packet, an ATM address corresponding to the ATMARP table of the ATMARP module 23 is registered (step S52), and a setup request message is generated. (Step S53), the data is transmitted to the ATM signaling module (step S54).

By the way, in step S48, if the corresponding ATMARP packet is identified as an ARPNAK packet instead of an ATMARP request packet or ATMARP response packet, the currently waiting IP packet is discarded.

As described above, the ADSL router of the present invention is capable of transmitting and receiving IP packets providing both the PPPoA protocol and the IPoA protocol by using an LLC encapsulation and restoration scheme. It is possible to encapsulate and transmit in the corresponding protocol, and to analyze the LLC header of the received IP packet when receiving the corresponding IP packet, and to distinguish whether it is a PPPoA packet or an IPoA packet and receive the corresponding protocol.

Meanwhile, in addition to analyzing the LLC header as a method of identifying whether the received IP packet is a PPPoA packet or an IPoA packet, there is a method of comparing the VC channel where the IP packet is received when the ADSL router uses the VC multiplexing method. By identifying whether the corresponding VC channel is a PPP channel, it is possible to distinguish a PPPoA packet from an IPoA packet. In this case, an LLC encapsulation and restoration process is unnecessary.

Meanwhile, in the ATM signaling module 28, the broadband low layer information element of the setup message should be applied differently according to the VC multiplexing method or the LLC encapsulation method for the PPPoA protocol or the IPoA protocol. In this case, the VC multiplexing method applies 'ISO / IEC (International Orgaganization for Standardization / International Electrotechnical Commission) Technical Report (TR) 9577' to the Layer 3 protocol field to indicate that the LLC field is used for Layer 2. '0xCF', which means that the initial octet's IPI (Initial Protocol Identifier) value is a PPP packet, is applied, and when the LLC encapsulation method is used, 'ISO / IEC8802- indicating LAN logical link control in the layer 2 protocol field is applied. 2 'is applied.

In the case of the IPoA protocol, when using the VC multiplexing method, 'ISO / IEC TR 9577' is applied to the layer 3 protocol field to indicate that the LLC field is used for layer 2, and the IPI value of the extended octet is referred to as an IP packet. '0xCC' is applied, and when the LLC encapsulation method is used, 'ISO / IEC8802-2' indicating LAN logical link control is applied to the layer 2 protocol field in the same way as the PPPoA protocol.

In addition, the ATM signaling module adds a service type field to a call control table to distinguish signaling services using each call. The corresponding service type information may be a PPPoA module of the ATM protocol module 26. 26-1) and the IPoA module 26-2 include their service type information in the setup request message and deliver the service type information to the ATM signaling module 28, the module corresponding to the call control table in the corresponding ATM signaling module 28. By storing and managing the service type information, the call establishment and release management can be performed for each PPPoA module 26-1 or IPoA module 26-2 of the corresponding ATM protocol module 26.

In addition, the embodiments according to the present invention are not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention implements the PPPoA protocol and the IPoA protocol to be supported by one ADSL router, performs call setup and release management for each protocol, and simultaneously transmits and receives packets with the corresponding protocol, thereby making it a protocol used in a communication network. Regardless, the ADSL router can be installed.

In addition, by supporting both the PPPoA protocol and the IPoA protocol in the ADSL router, it is possible to construct an efficient and economical network without having to duplicate the communication network in which the protocol is mixed.

Claims (13)

An ATM protocol module which initializes the PPPoA protocol and the IPoA protocol, analyzes the connection information of the transmission packet and the LLC header of the reception packet, determines a protocol to be transmitted, and determines a protocol to which a control request is forwarded; An ATM router supporting multiple protocols, comprising: an ATM signaling module for storing service type information capable of distinguishing a PPPoA protocol from an IPoA protocol in a call control table to separately perform call processing and management of each protocol. The method of claim 1, When the PPP connection with the ATM protocol module is established, the IP module further registers the routing information for the PPP port in the IP routing table and registers the IP information and the connection information of the PPP port in the ATMARP table of the ATMARP module. ASD router supporting multiple protocols, characterized in that. The method according to claim 1 or 2, The ATM protocol module includes: a PPPoA module for providing call setup and data encapsulation and recovery functions for an initial PPP connection; ALS supports multiple protocols, including IP encapsulation and restoration for the Internet Protocol definition, connection management, signal interface for call setup and teardown, and IPoA module for establishing and maintaining a connection with a server. router. Initializing the PPPoA protocol by PPP access through the VC channel configured by signaling and simultaneously setting the VC channel with the ATMARP server to initialize the IPoA protocol; Encapsulating an LLC packet of PPPoA or IPoA according to a next hop IP address and port of the IP packet and transmitting the encapsulated protocol through a VC channel; Analyzing the LLC header of the received packet to distinguish whether it is a PPPoA packet or an IPoA packet, receiving the corresponding protocol, restoring the LLC header of the corresponding packet, and forwarding the packet to the next hop port; Packet sending / receiving method of ADL router supporting protocol. The method of claim 4, wherein The process of initializing the protocol may include establishing a VC channel with a peer PPP using signaling to support an IPoA protocol; Initializing the PPPoA protocol by registering the routing information for the PPP port in the IP routing table and registering the IP information and the connection information in the ATMARP table; Establishing an VC channel with an ATMARP server to register IP address information and ATM address information in the ATMARP server and ATMARP table, and additionally registering static routing information for the IPoA port in the IP routing table to initialize the IPoA protocol. Packet transmission and reception method of a DSL router supporting multiple protocols, characterized in that. The method of claim 4, wherein Encapsulating the IP packet into an LLC header of PPPoA or IPoA and transmitting the IP packet to a corresponding protocol through a VC channel, retrieving information registered in an IP routing table to determine a next hop IP address and port necessary for IP packet transmission. Steps; If the determined next hop port is an ATM port, checking an ATMARP table to determine whether there is registration information regarding the next hop IP address; Checking whether the registered VC channel is a VC channel connected to the opposite PPP when the registration information exists; Encapsulating the IP packet into a PPP header and an LLC header for PPPoA in the case of the VC channel connected to the other side PPP, and transmitting the packet over the VC channel. . The method of claim 6, Determining a next hop IP address and a port required for transmitting the IP packet, if the next hop port is an Ethernet port, checking an ARP table to determine whether there is registration information regarding the next hop IP address; If the registration information exists, transmitting the IP packet in an encapsulated Ethernet frame; And generating the ARP request packet including the next hop IP address and transmitting the encapsulated Ethernet frame when the registration information does not exist. The method of claim 6, Determining whether there is registration information regarding the next hop IP address, and if the registration information does not exist, generating an ATMARP request packet including the next hop IP address; And encapsulating the generated ATMARP request packet into an LLC header for IPoA, and transmitting the encapsulated ATMARP request packet to an ATMARP server through a VC channel. The method of claim 8, Establishing a VC channel through signaling when an ATMARP response packet is received from the ATMARP server; And encapsulating the currently waiting IP packet into an LLC header for IPoA, and transmitting the encapsulated IP packet through the VC channel. The method of claim 6, Determining whether the registered VC channel is a VC channel connected to a partner PPP, and if the VC channel is not connected to a partner PPP, encapsulating the LLC VC channel into an LLC header for an IPoA and transmitting the VC channel through the VC channel. Packet transmission and reception method of a DSL router that supports multiple protocols. The method of claim 4, wherein The process of restoring the LLC header of the received packet to the next hop port may include analyzing a header of the received packet to determine whether the packet is a PPPoA packet starting with the LLC header of the PPP or an IPoA packet starting with the LLC header of the IPoA. Wow; Restoring the LLC header and the PPP header of the PPPoA packet when the packet is identified as a PPPoA packet to obtain an IP packet; And routing the IP packet and forwarding the IP packet to a next hop port. The method of claim 11, Restoring the LLC header of the IPoA packet when the header of the received packet is determined to be an IPoA packet; Checking whether the recovered packet is an IP packet or an ATMARP packet; If it is determined as an IP packet, the packet transmission and reception method of the DSL router supporting multiple protocols further comprising the step of routing the IP packet forwarded to the next hop port. The method of claim 12, Checking whether the restored packet is an IPoA packet or an ATMARP packet, and if it is determined to be an ATMARP packet, checking whether the restored packet is an ATMARP request packet or an ATMARP response packet; In the case of an ATMARP request packet, generating a corresponding ATMARP response packet, encapsulating it in an LLC header of an IPoA, and transmitting the packet to an ATMARP server through a corresponding VC channel; In the case of an ATMARP response packet, after registering an ATM address corresponding to the ATMARP table, generating and transmitting a setup request message to the ATM signaling module, the method of transmitting and receiving a packet of an SDL router, which supports multiple protocols.