WO2018133334A1 - Système d'accès sans fil l2tp et son procédé d'interaction - Google Patents

Système d'accès sans fil l2tp et son procédé d'interaction Download PDF

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Publication number
WO2018133334A1
WO2018133334A1 PCT/CN2017/091052 CN2017091052W WO2018133334A1 WO 2018133334 A1 WO2018133334 A1 WO 2018133334A1 CN 2017091052 W CN2017091052 W CN 2017091052W WO 2018133334 A1 WO2018133334 A1 WO 2018133334A1
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WO
WIPO (PCT)
Prior art keywords
wireless access
wireless
access point
l2tp
configuration
Prior art date
Application number
PCT/CN2017/091052
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English (en)
Chinese (zh)
Inventor
夏亮
朱丽娟
Original Assignee
深圳国人通信股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication of WO2018133334A1 publication Critical patent/WO2018133334A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/825—Involving tunnels, e.g. MPLS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to L2TP (Layer 2 Tunneling)
  • the wireless access system and its interaction method use L2TP to perform tunnel encapsulation and decapsulation interaction between data packets between the wireless access point and the radio access controller.
  • the AP automatically discovers the AC, the AC authenticates the AP, the AP obtains the software image from the AC, and the AP obtains the initial and dynamic configuration from the AC.
  • the system can support local data forwarding and centralized data forwarding.
  • the centralized data forwarding encapsulates the data packet of the STA by the AP and performs the forwarding processing by the AC, which reduces the burden on the AP and facilitates unified management of the AC.
  • CAPWAP is a standardized protocol
  • LINUX kernel there is no standard code available in the LINUX kernel. It needs to be re-issued, re-editing the message format and message content, and the bursting difficulty is increased and the burst period is long.
  • all major domestic manufacturers have customized a set of private CAPWAP protocols. If devices need to be interconnected, they need to re-issue the kernel code.
  • the CAPWAP protocol is mainly used in carrier-class A C devices, and the number of management APs can reach thousands.
  • WLAN networks are gradually miniaturized into small and medium-sized commercial enterprises, for example, department stores, hospitals, cafes, etc., the number of APs that may be required for each scene. Dozens or even one or two, then the demand for AC orders is greatly weakened, miniaturized A C is gradually welcomed by the market due to its affordable price, and it is also a new product developed by major manufacturers.
  • miniaturized AC still uses the CAPWAP protocol in data forwarding with the AP, it will greatly increase the difficulty and length of the bursting, increase the equipment cost, and miss the market opportunity.
  • the object of the present invention is to overcome the deficiencies of the above technologies, and provide a wireless access system based on L2TP and an interaction method thereof.
  • An aspect of the present invention provides an L2TP-based wireless access system interaction method, including the following steps: a wireless access point joins a wireless access controller through the Internet, and configures wireless access on the wireless access controller.
  • the wireless client goes online, sends a data packet to the wireless access point to access the external network; the wireless access point will receive The data packet is converted into an Ethernet frame, and the L2TP tunnel is set up according to the WLAN configuration and the L2TP tunnel configuration, and the data packet is encapsulated and sent to the radio access controller; the radio access controller receives the encapsulation After the data packet, the transport port checks the destination port number of the encapsulated data packet, and learns the encapsulated datagram.
  • the tunnel packet is unpacked, and the Layer 2 forwarding is sent to the broadband access server of the external network device; the broadband access server of the external network device replies to the Ethernet frame packet to the wireless access controller;
  • the path of the wireless client is searched through the mapping table of the port, and the packet is encapsulated by the L2TP layer 2 tunnel and sent to the wireless access point.
  • the wireless access point learns the source port number of the encapsulated packet.
  • the encapsulated packet is a tunnel packet, and is unpacked and forwarded to the wireless client.
  • the wireless access controller further includes the following steps: determining the forwarding of the service set identifier configuration of the wireless local area network of the wireless access point Type, the forwarding type includes centralized forwarding and local forwarding. If the service set identifier is configured with centralized forwarding, the wireless access controller sends a wireless local area network with a virtual local area network ID of 1-4096 to the wireless network. The access point, and the L2TP tunnel configuration is delivered at the same time, if the service set identifier is configured. The local forwarding is performed, and the WLAN configuration and the L2TP tunnel configuration are not required to be sent. The data packets sent by the subsequent wireless clients are directly processed by the wireless access point.
  • the method further includes: detecting whether the data packet is sent to the wireless access point itself, and if yes, performing the internal Processing, if not, the wireless access point establishes an L2TP tunnel according to the WLAN configuration and the L2TP tunnel configuration to encapsulate the data packet.
  • the step of the wireless access point joining the wireless access controller through the Internet includes: the wireless access controller pre-configuring information of the wireless access point, where the information includes version information and/or a MAC address; The wireless access point is successfully powered on and joins the wireless access controller.
  • the radio access controller includes an uplink interface, a downlink interface, and a sub-interface corresponding to the virtual local area network interface that is internally divided by the radio access controller, where the sub-interface includes a downlink sub-interface, a bridge interface, and a processing port for connecting to the L2TP tunnel; the radio access controller forwards the data packet to the broadband access server of the external network device by using the uplink interface; and the radio access controller After the L2TP Layer 2 tunnel is encapsulated, the Ethernet frame is sent to the bridge interface and the downlink sub-interface, and then sent to the wireless access point. If the data packet is sent to the wireless access point itself, the The bridge interface is handled internally by the wireless access point.
  • the source port number of the wireless access point is configured by the wireless access controller to send a wireless local area network to the wireless access point, and the database is generated from the wireless access point and imported into the wireless access controller.
  • the ID number of the source port number obtained by adding 30000 to the ID number; the destination port number of the radio access controller is 5247.
  • a second aspect of the present invention provides an L2TP-based wireless access system, including a wireless access point and a wireless access controller;
  • the wireless access point includes: a first receiving module, configured to receive a wireless connection The WLAN configuration and the L2TP tunnel configuration are sent to the controller;
  • the second receiving module is connected to the wireless client, and is configured to receive the data packet sent by the wireless client to access the external network;
  • the third receiving module is configured to Receiving a packet sent by the radio access controller for performing L2TP Layer 2 tunnel encapsulation;
  • the first processing module is respectively connected to the first receiving module and the second receiving module, and configured to send data sent by the received wireless client
  • the packet is converted into an Ethernet frame, and the L2TP tunnel is set up according to the WLAN configuration and the L2TP tunnel configuration, and the data packet is encapsulated and sent to the radio access controller;
  • the second processing module The third receiving module is connected to the source port number of the packet encapsulated in the L2TP layer 2 tunnel, and the encapsulated packet
  • the radio access controller includes: a first sending module, connected to the first receiving module, configured to send a wireless local area network configuration and an L2TP tunnel configuration to a wireless access point; and a fourth receiving module,
  • the first processing module is connected to receive the encapsulated data packet sent by the wireless access point
  • the fifth receiving module is connected to the broadband access server of the external network device, and is configured to receive the broadband access of the external network device.
  • the third processing module is respectively connected to the broadband access server of the fourth receiving module and the external network device, and is configured to receive the encapsulated data packet sent by the wireless access point.
  • a fourth processing module configured to be connected to the fifth receiving module and the third receiving module, and configured to search for a path of the wireless client according to the mapping table of the port,
  • the packet of the Ethernet frame replied by the broadband access server of the network device is encapsulated by the L2TP Layer 2 tunnel and sent to the wireless access point.
  • the radio access controller further includes a determining module, configured to be connected to the first sending module, and configured to determine, if the forwarding type of the service set identifier configuration of the wireless local area network of the wireless access point, Forwarding types include centralized forwarding and local forwarding.
  • the wireless access point further includes a detection module, which is respectively connected to the second receiving module and the first processing module, and is configured to detect whether a data packet sent by the wireless client is sent to the wireless access Point itself.
  • the radio access controller further includes a configuration module, where the configuration module is configured to pre-configure information of the wireless access point, where the information includes version information and/or a MAC address;
  • the point further includes an adding module, and is connected to the configuration module, and is configured to join the wireless access controller after the wireless access point is successfully powered on.
  • the present invention adopts the L2TP standard protocol to complete the encapsulation and decapsulation of the tunnel between the AP and the AC, and realizes data interaction between the STA, the AP, the AC, and the BAS, and the provided tunnel header compression can reduce the system's credit sales. Low difficulty, short cycle, good compression and encryption performance, low cost, compatible with equipment from different manufacturers, more suitable AC architecture for small commercialization.
  • FIG. 1 is a schematic diagram of an L2TP-based wireless access system according to the present invention.
  • FIG. 2 is a schematic flowchart of an interaction method of an L2TP-based wireless access system according to the present invention
  • FIG. 3 is a schematic diagram of interaction of an interaction method of the wireless access system shown in FIG. 2;
  • FIG. 4 is a schematic diagram of interaction of internal ports of the radio access controller shown in FIG. 2.
  • a wireless access system based on L2TP includes a wireless access point 10 (Acess Point, AP for short), and a wireless connection.
  • the wireless client 30 (Station, referred to as: STA) and the broadband access server 40 of the external network device (Broadband Access)
  • the broadband access server 40, the wireless local area network, the virtual local area network, and the service set identifiers of the wireless access point 10, the wireless access controller 20, the wireless client 30, and the external network device are respectively referred to as AP, AC, STA, and BAS, respectively.
  • AP wireless local area network
  • virtual local area network virtual local area network
  • service set identifiers of the wireless access point 10 the wireless access controller 20
  • the wireless client 30 the external network device
  • WLAN, VLAN, SSID to indicate.
  • the AP 10 includes: a first receiving module 11 configured to receive a WLAN configuration and an L2TP tunnel configuration delivered by the AC 20, and a second receiving module 12, configured to receive the data packet sent by the STA 30,
  • the third receiving module 13 is configured to receive the packet sent by the AC 20 and perform the L2TP layer 2 tunnel encapsulation;
  • the first processing module 14 is respectively connected to the first receiving module 11 and the second receiving module 12,
  • the data packet sent by the received STA 30 is converted into an Ethernet frame, and the L2TP tunnel is set up according to the WLAN configuration and the L2TP tunnel configuration to encapsulate the data packet and sent to the AC 20;
  • the connection is used to check the source port number of the packet encapsulated in the L2TP Layer 2 tunnel.
  • the encapsulated packet is a tunnel packet, and is unpacked and forwarded to the STA 30.
  • the detection module (not shown) And being connected to the second receiving module 12 and the first processing module 14, respectively, for detecting whether the data packet sent by the STA 30 is sent to the AP 10 itself.
  • the AC 20 includes: a first sending module 21, connected to the first receiving module 11, configured to send a WLAN configuration And L2TP tunnel configuration to AP
  • the fourth receiving module 22 is connected to the first processing module 14 and configured to receive the encapsulated data packet sent by the AP 10.
  • the fifth receiving module 23 is connected to the BAS 40 and configured to receive the Ethernet frame replied by the BAS 40.
  • the third processing module 24 is connected to the fourth receiving module 22 and the BAS 40, and is configured to: after receiving the encapsulated data packet sent by the AP 10, view the encapsulated data packet to the transport layer. The port number is obtained, and the encapsulated data packet is a tunnel packet, and the data packet is unpacked, and the data packet is forwarded to the BAS 40.
  • the fourth processing module 25 is respectively connected to the fifth receiving module 23 and the third receiving module 13.
  • the connection is used to search the path of the STA 30 according to the mapping table of the port, and encapsulate the packet of the Ethernet frame replied by the BAS 40 into the L2TP Layer 2 tunnel and send it to the AP 10; the determining module (not shown), and the first
  • the sending module 21 is connected to determine the forwarding type of the SSID configuration of the WLAN of the AP 10, and the forwarding type includes centralized forwarding and local forwarding.
  • the device further includes a configuration module (not shown), and the configuration module is configured to pre-configure the information of the AP 10, where the information includes version information or a MAC address, and may include other versions, a MAC address, and the like;
  • the module is added to the module, and is connected to the configuration module, and is used to join the AC 20 after the AP 10 is successfully powered on.
  • an interaction method based on the L2TP wireless access system includes the following steps:
  • the Sl and the AP 10 join the AC 20 through the Internet, and configure the WLAN configuration of the AP 10 on the AC 20.
  • the specific steps of the AP 10 to join the AC 20 through the Internet include: The AC 20 pre-configures the information of the AP 10, where the information includes version information or a MAC address. Of course, the information may also include other information such as version information and MAC address. 10 Powered on successfully to join AC 20.
  • the S2 and the AC 10 deliver the WLAN configuration and the L2TP tunnel configuration to the AP 20.
  • the L2TP tunnel configuration includes the IP address of the AP 10 (Src-IP), the IP address of the downlink interface of the AC 20 (Dst-IP), the source port number of the AP 10 (Src-port), and the destination port number of the AC 20 (Dst- Port).
  • the AP 20 includes the following steps: determining the forwarding type of the SSID configuration of the WLAN of the AP 10, and the forwarding type includes centralized forwarding and local forwarding. If the SSID is configured with centralized forwarding, the AC is configured. 20 will send a WLAN configuration with a VLAN ID ranging from 1-4096 to the AP.
  • the AP 10 sends the L2TP tunnel configuration at the same time. If the SSID is configured with local forwarding, no WLAN configuration is required. After the L2TP tunnel is configured, the data packets sent by the subsequent STAs 30 are directly processed by the AP 10.
  • the source port number (Src-port) of the AP 10 is the ID number generated by the AC 20 for the AP 10 to deliver the WLAN configuration, and the database 10 is imported into the AC 20 from the AP 10, and is added to the ID number.
  • the destination port number (Dst-port) of the AC 20 is 5247.
  • the STA 30 is online, and sends a data packet to the AP 10 to access the external network.
  • the data packet is a data packet of the 802.11 protocol.
  • the AP 10 converts the received data packet into an Ethernet frame, and sets up an L2TP tunnel to encapsulate the data packet according to the WLAN configuration and the L2TP tunnel configuration, and sends the data packet to the AC 20. Before establishing the L2TP tunnel, the AP 10 further includes the following steps: detecting whether the data packet is sent to the AP 10 itself, and if yes, processing by the AP 10 internally; if not, the AP 10 is configured according to the WLAN configuration and the L2TP tunnel configuration. The L2TP tunnel encapsulates data packets.
  • the AC 20 After receiving the encapsulated data packet, the AC 20 checks the destination port number (Dst-port) of the encapsulated data packet to the transport layer, and learns that the encapsulated data packet is a tunnel packet and is unpacked. , and do a Layer 2 forwarding to B AS 40, with BAS
  • 40 connected external network devices can perform services such as DHCP, RADIUS authentication and accounting, portal push, and web browsing.
  • the AC 20 searches for the path of the STA 30 through the mapping table of the port, and encapsulates the packet into the L2TP Layer 2 tunnel and sends the packet to the AP 10.
  • the AP 10 by looking at the source port number (Src-port) of the encapsulated packet, learns that the encapsulated packet is a tunnel packet, and is unpacked and forwarded to the STA 30.
  • Src-port source port number
  • AC 20 includes an uplink interface (ethl) 18 and a downlink interface (ethO), AC.
  • ethl uplink interface
  • ethO downlink interface
  • the VLAN interface is divided.
  • Each VLAN interface is assigned with a set of sub-interfaces: a downlink sub-interface, a bridge interface, and a processing port for connecting to the L2TP tunnel. .
  • the bridge interface is connected to the processing port, and the processing port utilizes the L2TP standard protocol. It is responsible for the encapsulation and decapsulation of the tunnel.
  • the process of processing the data packet is as follows: If the data packet is sent to the AC 20, the data packet is forwarded to the bridge interface and directly processed by the AC 20 internal protocol; The data message is sent from STA 30 to B AS.
  • the uplink interface (ethl) 18 if the data is sent from the BAS 40 to the STA 30, it is encapsulated and forwarded to the bridge interface, and then forwarded by the bridge interface to the downlink sub-interface.
  • the set of sub-interfaces corresponding to the VLAN interface are: a downlink sub-interface (ethO.X), a bridge interface (brX) 17, and a connection for L2TP.
  • the AC 20 forwards the data packet to the BAS 40 via the uplink interface (ethl) 18.
  • the L2TP Layer 2 tunnel is encapsulated in the Ethernet frame and sent to the bridge interface (brX) 17.
  • the downlink sub-interface (ethO.X) 19 is sent to the AP 10. If the test data packet is sent to the AP
  • bridge interface (brX) 17 is handed over to the inside of the AP 10.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un système d'accès sans fil L2TP et à un procédé d'interaction s'y rapportant. Le procédé d'interaction comprend les étapes suivantes : un point d'accès sans fil relie un contrôleur d'accès sans fil par le biais d'Internet ; le contrôleur d'accès sans fil émet une configuration de réseau local sans fil et une configuration de tunnellisation L2TP au point d'accès sans fil ; un client sans fil va en ligne et envoie un message de données au point d'accès sans fil ; le point d'accès sans fil encapsule le message de données et l'envoie au contrôleur d'accès sans fil ; le contrôleur d'accès sans fil dés-encapsule le message de données encapsulé et met en œuvre un acheminement à deux couches pour l'envoyer à un serveur d'accès à large bande d'un dispositif de réseau externe ; le serveur d'accès à large bande du dispositif de réseau externe répond à un message d'une trame Ethernet au contrôleur d'accès sans fil ; le contrôleur d'accès sans fil recherche un chemin du client sans fil au moyen d'une table de mappage de port, et met en œuvre une encapsulation de tunnellisation à deux couches L2TP sur le message et l'envoie au point d'accès sans fil ; le point d'accès sans fil dés-encapsule le message encapsulé et le transmet au client sans fil. La présente invention utilise un protocole de norme L2TP pour effectuer une interaction de données entre des STA, des AP, des AC et des BAS, et présente une bonne efficacité de compression et de cryptage et de faibles coûts.
PCT/CN2017/091052 2017-01-22 2017-06-30 Système d'accès sans fil l2tp et son procédé d'interaction WO2018133334A1 (fr)

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CN201710053334.9A CN106793013A (zh) 2017-01-22 2017-01-22 基于l2tp的无线接入系统及其交互方法

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CN106793013A (zh) * 2017-01-22 2017-05-31 深圳国人通信股份有限公司 基于l2tp的无线接入系统及其交互方法
CN109041275B (zh) * 2018-06-28 2022-02-11 新华三技术有限公司 数据传输方法、装置及无线接入点
CN109005179B (zh) * 2018-08-10 2020-11-06 常州中价之星软件技术有限公司 基于端口控制的网络安全隧道建立方法
CN108737277B (zh) * 2018-08-30 2021-02-26 新华三技术有限公司 一种报文转发方法及装置
CN110601893B (zh) * 2019-09-18 2022-12-20 成都西加云杉科技有限公司 一种数据传输系统、方法和装置

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