TW201223221A - Network apparatus and method for assigning internet protocol addresses for clients - Google Patents

Abstract

A method for assigning internet protocol (IP) addresses for clients in local area network (LAN) and a network apparatus utilizing the same. The method comprises receiving request packets for acquiring IP address sent from the clients and forwarding the IP packets to wide area network (WAN). If corresponding response packets for the request packets are received from the WAN in a predetermining time, the response packets are forwarded to the clients in the LAN for assigning public IP addresses. If the predetermining time is timeout, the clients would be assigned dynamic private IP addresses by an internet protocol server service running in the network apparatus.

Description

201223221 VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a technique for allocating Internet Protocol Addresses, particularly to a network device that allocates an Internet Protocol address to a client of a regional network. Methods. [Prior Art] [0002] Public Intei_net pFQtQeQl Address (referred to as public IP address) obtained by a general enterprise, institution, or individual from an Internet service provider (Internet ServiCe Pr〇vider) The number is limited. When the Local Area Network (LAN) is set up, it is not enough for all users to use. Therefore, the IP addresses allocated by the clients in the local area network are currently allocated. It belongs to the private IP address (private IP Ad-dress). The private IP address can be used internally by enterprises, institutions or homes, which makes the local network of the history more flexible. However, the disadvantage is that the user using the private IP address cannot directly connect to the Internet. Users on the network cannot directly access the local area network_user terminal, and must be converted by network address in a device such as a gateway or router (Netw〇r*k

Address Translation (NAT) mechanism, which can be used to connect to a wide area network (such as the Internet), or to users in the Guangwei network. service. However, there are still restrictions on the use of NAT. For example, NAT cannot allow users in the Granville network to establish a point-to-point connection with the users in the local area network. In addition, the quality of service on the client side ( Q〇s) and food safety etc. & 099140287 Form No. A0] 01 Page 4 / Total 23 Page 0992070184 ^ [0003] 201223221 [0004] [0005] ❹ ❹ [0006] will also fail. SUMMARY OF THE INVENTION In this case, % 竓 provides a network device for assigning an IP address to a client of a regional network and using the method, so that the user can select and use according to actual difficult requirements. Public IP address or private IP address. The device is used for connecting a local area network host server and a server n. The network device includes a local area network interface, a wide area network interface, a packet delivery module, and a dynamic address allocation module. The local area network interface connects the client host, the WAN interface, and the "°5H server. When the packet transceiver module receives the request packet for obtaining the Internet Protocol address transmitted by the client host from the local area network interface, the request packet is forwarded to the WAN interface to the server, and waits for the preview time. If the reply packet corresponding to the request packet is received from the WAN interface within the predetermined time range, the packet is forwarded to the local area network interface to the client host. If the scheduled time has not received any reply packet corresponding to the request packet from the WAN interface, then the dynamic address allocation module initiates an Internet connection protocol server service, distribution - dynamic private internet The protocol address is given to the client host. Preferably, the request packet includes a dynamic host configuration protocol request packet and an Ethernet peer-to-peer protocol request packet. Preferably, the reply packet includes a dynamic host configuration agreement reply packet and an Ethernet peer-to-peer protocol reply packet. 099140287 Form No. ΗΗ0ΗΗ Page 5/Total 23 Page 0992070184-0 [0007] 201223221 [0008] Preferably, if the client host receives the reply packet forwarded by the network device, the client host is assigned A public internet protocol address. [0009] Preferably, the internet connection agreement server service comprises a dynamic host configuration agreement server service and an Ethernet peer-to-peer protocol server service. [0010] A method for configuring a network protocol address for a client host by a network device having a capability of a client host and a wide area network server connecting the local area network, the method comprising the steps of: receiving a host from the client Retrieving the request packet of the Internet Protocol address and forwarding it to the server; waiting for a predetermined time, if receiving the reply packet corresponding to the request packet from the server within the predetermined time, forwarding the reply packet to the client host And if the predetermined time has elapsed without receiving a reply packet from the server corresponding to the request packet, launching an internet connection protocol server service, assigning a dynamic private internet protocol address to the client host . [0011] Preferably, the request packet includes a dynamic host configuration agreement request packet and an Ethernet peer-to-peer protocol request packet. [0012] Preferably, the reply packet includes a dynamic host configuration agreement reply packet and an Ethernet peer-to-peer protocol reply packet. [0013] Preferably, if the client host receives the reply packet from the server, the client host is assigned to a public internet protocol address [0014], preferably, the internet connection The protocol server service includes the dynamic host configuration protocol server service and the Ethernet peer-to-peer protocol server service. 099140287 Form No. A0101 Page 6 of 23 0992070184-0 201223221 [0015] The above and the technical results of the invention will be readily apparent from the following detailed description of the embodiments of the invention. [Embodiment] The method for allocating a 丨p address to a client of a local area network can be implemented in various network devices, such as a router, an inter-channel, etc., with any connected area network and A network device with a wide area network function. Referring to FIG. 1, there is shown a constituent element of an embodiment of a network environment in which the present invention can be implemented, including a network device having a function of connecting a local area network 30 and a wide area network 0, and is located in a regional network. The client host 31 to the client host 33 in the third port can access the server 21 located at one end of the wide area network 2 via the ancient network device. '-, just as shown in Fig. 2' shows a network diagram of an embodiment of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are illustrated. The network device 100 is an implementation of the network device 1 shown in FIG. 1. The network device 100 includes at least one processor 11 , a memory 12 , a timer module 130 , and a connection area network. The LAN port 路 interface of the channel 3 is used to connect the WAN interface 15 of the WAN 2, the packet delivery module m, and the dynamic address allocation group 17 () to address the conversion module = 〇. The module is a software program having a specific power *" executed by the processor 11Q. The software programs are stored in the memory 120, a computer readable storage medium or other storage device. The processor is used to perform packet reception. The G dynamic address allocation module and the address conversion module 18, and the application programs not shown in FIG. The memory no is used to store the packet delivery module 16〇, the dynamic address allocation module 17〇, the address conversion module 180, and other application code not shown in FIG. 2, and the 099140287 form number A0101 is 7 Page / Total 23 pages 0992070184-0 201223221 Temporary information generated by the n-type and any other data. The timer module 130 executes timings via an application such as a timing control module such as a packet delivery module 160, a dynamic personalization board, and a 17-inch application. L-end interface 14 〇 3 3 复 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 乙 埠The face i5Q needs to obtain a public address such that the client hosts (e.g., one or more of the client hosts 33 shown in the network device) in the network device (10) are connected to the devices of the wide area network 20. In this implementation method, the session interface 15() can be configured by a dynamic host configuration protocol (J) ynainic Hc) st C〇nf i gurat i on

Protocol 'abbreviated as DHCP', Point-to-Point Protocol over Ethernet (PPPoE) or peer-to-peer protocol (PPTP) and DHCP server 211. The PPPoE server 212 or the PPTP server 213 is connected to implement a dynamic host configuration protocol service, an Ethernet peer-to-peer protocol service, or a peer-to-peer tunneling protocol service to obtain a dynamic public IP address, which is performed by the processor 110. The code sets the static public IP address by itself. The DHCP server 211, the PPPoE server 212, and the PPTP server are different embodiments of the server 21. [0018] The packet delivery module 160 is configured to receive the packet from the LAN interface 140 and the WAN interface 150, and is also used to transmit the packet to the LAN interface 140 and the WAN interface 150, and if the packet receiving module 丨 60 receives To the IP packet from the LAN interface and the source IP address is the private 1P address or the IP packet from the WAN interface with the destination IP address being the public 1p address, then the IP packet is transmitted to the 099140287 form nickname A0101. 8 pages / 23 pages 0992070184-0 201223221 sent to the address conversion module 180 for the conversion of the private ιρ address and the common Khan address; the dynamic address allocation module 17 〇 according to the Internet supported by the client host The connection agreement 'provides the corresponding DHCp or ppp〇E server service' to allocate the dynamic private address to the above-mentioned client host of the local area network 3; the address conversion module 18 is used to carry the packet The private IP address of the client host in the local area network 30 or the public IP address of the terminal interface 15 is private/public address translation, so that the client host can be connected to the server on the WAN side and used to provide the same. Service. 〇[_ * 参3, not the network device of the present invention {the above-mentioned client host assigns an IP address method - the seeding method takes _, the method is used in the network device 1GG of FIG. 2' After the above-mentioned client host of the regional network lion is powered on, the method is used to determine the IP address assigned to the client host.四 (4) The above-mentioned client host of the network 30, after booting (or the network connection service is started), according to the Internet connection agreement Dunting:, sends a corresponding packet for obtaining the IP address. In step S31, when the packet receiving module 160 of the network device ί 100 receives the packet from the LAN interface 14 and parses the content of the request packet to obtain an address request, in step 320, The server that obtains the address request packet to the WAN end is forwarded through the WAN interface 15 , and at the same time, the timer module 13 starts a timer to receive the scheduled time according to the Internet connection protocol supported by the client. The time range in which the WAN server responds to the packet. In step S340, if the packet receiving module 160 receives the reply packet corresponding to the obtained address request packet from the WAN end within the set time range, the packet is forwarded to the LAN in step S340. The terminal is given to the above host host. If 099140287 Form nickname A0101 Page 9 of 23, 〇992〇7〇184-〇201223221 The set time range has passed, and no reply packet from the WAN end corresponding to the request for obtaining the IP address is received. If the step S 3 50 does not, a dynamic private IP address is allocated to the user via the server service corresponding to the Internet connection protocol supported by the client host in the dynamic address allocation module 丨7 〇 End host. That is, the network device 100 first attempts to obtain the public IP address of the client host through the Internet connection protocol, unless the W AN terminal server does not respond to the server built in the dynamic address allocation module. The service allocates the dynamic private 丨p address to the above-mentioned client host on the LAN side〇

[0021] The manner in which the user host obtains the public IP address may be based on DHCP or PPPoE. Please refer to FIG. 4, which illustrates a method for the network device of the present invention to allocate the address address to the client host supporting DHCP. The flow of the embodiment 囷 'This method is used in the network device 1 shown in FIG. 2, when the client host supporting DHCP in the area network 30 is powered on or starts DHCP.

After the service, use this method to determine the IP address assigned to the above-mentioned client host. [0022] In step 41, when the packet receiving module 160 of the network device 1 receives the packet from the LAN interface 140 and parses that the packet is a DHCP DISCOVER packet, in step 42, The DHCP DISCOVER packet is forwarded to the server on the WAN side via the WAN interface 15 while the timer module 130 starts a predetermined time period. The purpose of the timing is set within a certain time range, waiting for the WAN. The reply of the DHCP server to the DHCP DISCOVER packet, in other embodiments, the aforementioned time range can be designed to different values. In step S430, if the packet delivery module 160 is within the set time range, the time range is four seconds in the embodiment 099140287 Form No. A0101/Page 23/9292070184-0201223221 card. Receiving the DHCP OFFER packet corresponding to the DHCP DISCOVER packet from the WAN interface 150, forwarding the DHCP OFFER packet to the LAN interface 140 to the client host in step S440. Regarding the correspondence between the DHCP request packet and the reply packet, the source MAC address of the DHCP request packet may correspond to the destination MAC address of the DHCP reply packet. If the set time range has elapsed, for example, four seconds have not received any DHCP OFFER packet corresponding to the DHCP DISCOVER packet from the WAN interface 150, then DHCP is started via the dynamic address allocation module 170 as shown in step S490. The server service allocates a dynamic private IP address to the above-mentioned client host. In other embodiments, the network device 100 may allow the retransmission of the DHCP DISCOVER packet of the client host on the LAN end, that is, after the predetermined time range expires, repeat steps S410 and S420, and wait for a predetermined time range again to avoid the cause. The network congestion and other factors did not receive a response from the WAN end interface 150 server. After the network device 100 forwards the DHCP OFFER packet from the WAN interface 150 to the LAN interface 140, as shown in step S450, the packet delivery module 160 receives the DHCP REQUEST packet from the LAN interface 140. In order to complete the configuration of the public host IP address of the client host, in step S460, the packet delivery module 160 forwards the DHCP REQUEST packet to the WAN interface 150, and the timer module 130 starts timing for a predetermined time range. In the present embodiment, the time range is sixty seconds, and in other embodiments, the time range can be set to a different value. In step S470, if the DHCP ACK packet corresponding to the DHCP REQUEST packet from the WAN interface 150 is received within sixty seconds, the client host on the LAN side successfully configures a public IP address as shown in step S480. In step S470, if the set time range is 099140287, the form number A0101, page 11 / 23 pages 0992070184-0 201223221 has passed, if the timeout is sixty seconds, the WAN interface 1 50 is not received corresponding to the DHCP REQUEST packet. The DHCP ACK packet is as shown in step S490. The dynamic address allocation module 170 starts the DHCP server service and allocates a dynamic private IP address to the client host. [0023] Please refer to FIG. 5, which is a flowchart of an embodiment of a method for allocating an IP address to a client host supporting PPPoE according to the network device of the present invention. The method is used in the network device 1 shown in FIG. In the meantime, after the above-mentioned client host supporting PPPoE in the local area network 30 is powered on or after dialing service using PPPoE, the method is used to determine the IP address assigned to the client host.

[0024] In step 510, when the packet delivery module 160 of the network device 100 receives the packet from the LAN interface 140, and parses that the packet is a PPPoE.

During the Active Discovery Initiation (PADI) packet, in step 520, the PADI packet is forwarded to the server on the WAN side via the WAN interface 150, and the timer module 1 is called a predetermined time. The purpose is to set a time range and wait for a reply from the WAN server to the PAM packet. In other embodiments, the foregoing time range can be designed to a different value. In step S530, if the packet delivery module 16 is within the set time range, in the present embodiment, the time range is four seconds, and the PPPoE Active Discovery corresponding to the PADI packet from the WAN interface 150 is received. The Offer (PAD0) packet forwards the PAD0 packet to the LAN interface 140 to the client host in step S540. Regarding the correspondence between the PPPoE request packet and the reply packet, the source MAC address of the PPPoE request packet may correspond to the destination MAC address of the PPPoE reply packet. If 099140287 Form No. A0101 Page 12 / Total 23 Page 0992070184-0 201223221 The set time range has elapsed. For example, if the four-second timeout has not received any PAD0 packet from the WAN interface 150 corresponding to the PADI packet, then the steps are as follows. As shown in S590, the Ppp〇E server service is started via the dynamic address allocation module 17 to assign a dynamic private IP address to the client host. In other embodiments, the network device 1 can allow the retransmission of the PADI packet of the client host on the LAN side, that is, after the predetermined time range expires, repeat steps S510 and S520, and wait for a predetermined time range again to avoid The response from the WAN end interface 150 feeder was not received due to factors such as network congestion. After the network device 100 forwards the PAD0 packet from the WAN interface 150 to the LAN interface 44 as shown in step 540, the packet delivery module 160 receives the RADR packet from the LAN interface 140 as shown in step S550. The configuration of the public IP address of the client host is completed. In step S56, the packet delivery module 160 forwards the PADR packet to the WAN interface 150, and the timer module 130 starts timing for a predetermined time range. In the present embodiment, the time range is sixty seconds, and in other embodiments, the time range can be set to a different value. In step S570, if the PADS packet corresponding to the PADR packet from the WAN end interface 150 is received within a predetermined time, for example, sixty seconds, the user host of the LAN end successfully configures a public IP as shown in step S480. The address establishes a general PPP session with the WAN server. In step S570, if the set time range has elapsed, such as the timeout of sixty seconds, the PPPoE Active Discovery Session-confirmation (PADS) packet corresponding to the PADR packet from the ffAN end interface 150 is not received, and the step j is as shown in step S590. As shown, the dynamic address allocation module 170 initiates a PPP〇E server service and assigns a dynamic private IP address to the client host. 099140287 Form No. A0101 Page 13 of 23 0992070184-0 201223221 [0025] [0030] [0019] [0031] As described in the 'Dynamic Address Allocation Module 1 7 0 Different word server services may be included, and which server service is used depends on which internet connection setting is used by the client host in the area network 30. The DHCP server service can be started for the above-mentioned client host 'dynamic address allocation module 1 70 adopting the DHCP method; and the PPPoE server service can be started for the above-mentioned user terminal host dynamic allocation module adopting the ppp〇E mode. In summary, the above-mentioned client host IP allocation method proposed by the present invention is applicable to various network devices having the capabilities of the client host and the wide area network server of the network in the connection area, including but not limited to routers and gates. Channels and firewalls. In summary, the invention conforms to the patent requirements of the invention, and the patent application is filed according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an embodiment of a network environment in which the present invention can be implemented. Fig. 2 is a block diagram showing an embodiment of a network device of the present invention. FIG. 3 is a flow chart showing an embodiment of the method for allocating an address method to a client host by the network device of the present invention. 4 is a flow chart showing an embodiment of a method for a network device supporting a DHCP client to allocate an IP address to a network device according to the present invention. Figure b is a flow chart showing an embodiment of a method for the network device of the present invention to allocate an IP address to a client host supporting ppp〇E. 099140287 Form No. A0101 Page 14 of 23 0992070184-0 201223221

[0034] [0035] [0037] [0038] [0038] [0044] [0044] [0044] [Main component symbol description] Network device 10, 100 WAN 20 Server 21 Area Network 3 0 Client Host 31, 32, 33 Processor 110 Memory 120 Timer Module 130 LAN Interface 140 WAN Interface 150 Packet Delivery Module 160 Dynamic Address Allocation Module Group 170 address translation module 180

[0045] DHCP Server 211 [0046] PPPoE Server 212 [0047] PPTP Server 213 099140287 Form Number A0101 Page 15 of 23 0992070184-0

Claims (1)

201223221 VII. Patent application scope: The machine and a wide variety of servers are used to connect the user-side primary domain network of the local area network. The network device includes: the regional network interface, the light inspection _ a client host; a WAN interface for connecting to the server; a network client receiving a request packet obtained by the client host to obtain an internet protocol address, and forwarding the smart packet to the server And when receiving the reply packet corresponding to the request packet from the WAN service interface, the reply packet is forwarded to the client host and the dynamic address allocation module is used for After the (four) interval, the packet receiving module does not receive the reply packet from the WAN interface, and initiates an internet connection protocol service to allocate the dynamic private internet protocol address to the client. Host. For example, the network installation described in claim 1 of the patent scope includes a dynamic host for mosquitoes seeking w packets and 6 wifi dots; ^^ packets. For example, the network policy described in claim 1 of the patent scope, wherein the reply packet includes a dynamic host g-set agreement reply packet and an Ethernet peer-to-peer protocol reply packet. The network device of claim 1, wherein if the client host receives the reply packet forwarded by the network device, the user host is assigned to a public internet protocol address. The network device of claim 1, wherein the internet connection protocol server service comprises a dynamic host configuration protocol server service and 099140287 form number A0101 page 16 / 23 pages 0992070184-0 201223221 The peer-to-peer protocol server service. 6. A method of allocating an internet protocol address to a client, the client host being located in a local area network, the method being performed on a network device having the capability of connecting a server of the client host and a wide area network The method includes the steps of: receiving a request packet from the client host for obtaining an internet protocol address, forwarding the request packet to the server; waiting for a predetermined time, if receiving the servo from the server within the predetermined time Corresponding to the reply packet of the request packet, forwarding the reply packet to the client® host; and if the predetermined time has elapsed and not receiving the reply packet corresponding to the request packet from the server, starting an internet network The wire protocol server service allocates a dynamic private internet protocol address to the client host. 7. The method of allocating an internet protocol address to a client according to claim 6, wherein the request packet comprises a dynamic host configuration protocol request packet and an Ethernet peer-to-peer protocol request packet. 8. The method for allocating an internet protocol (Q) address to a client according to claim 6, wherein the reply packet comprises a dynamic host configuration agreement reply packet and an Ethernet peer-to-peer protocol reply packet. 9. The method for allocating an internet protocol address to a client according to claim 6, wherein if the client host receives the reply packet from the server, the client host allocates a Public internet protocol address. 10. The method for allocating an internet protocol address to a client according to claim 6, wherein the internet connection protocol server service comprises a dynamic host configuration protocol server service and an Ethernet peer-to-peer protocol. Server Service 099140287 Form No. A0101 Page 17 of 23 0992070184-0 201223221 Service 0 099140287 Form No. A0101 Page 18 of 23 0992070184-0