CN102469175A - Network device and method for distributing Internet protocol address to client - Google Patents

Abstract

Translated fromChinese

一种网络装置对局域网之客户端分配因特网协议地址的方法，该方法包括：客户端向网络装置传送关于获取因特网协议地址的请求封包，网络装置于接受后转发至广域网；若于预定时间内网络装置接收来自广域网对应于该请求封包的回复封包，转发该回复封包至局域网的客户端；若预定时间已过，未接收到来自广域网对应于该请求封包的回复封包，则网络装置启动一因特网连接协议服务器服务，由该服务器分配一动态私有因特网协议地址给局域网之客户端。本发明还提供一种执行上述方法的网络装置。本发明所提供的网络装置及其对局域网之客户端分配因特网协议地址的方法使得客户端可以根据实际的网络环境需求选择使用公用因特网协议地址或者私有因特网协议地址。

A method for a network device to assign an Internet protocol address to a client in a local area network, the method comprising: the client sends a request packet for obtaining an Internet protocol address to the network device, and the network device forwards it to the wide area network after receiving it; The device receives a reply packet corresponding to the request packet from the wide area network, and forwards the reply packet to the client of the local area network; if the predetermined time has elapsed and does not receive a reply packet corresponding to the request packet from the wide area network, the network device starts an Internet connection Protocol server service, the server assigns a dynamic private Internet protocol address to the client of the LAN. The present invention also provides a network device for executing the above method. The network device provided by the present invention and the method for assigning the IP address to the client of the local area network enable the client to choose to use the public IP address or the private IP address according to the actual network environment requirements.

Description

Network equipment and to the method for client assignment of internet protocol address

Technical field

The present invention relates to the technology of assignment of internet protocol address, relates in particular to the method for a kind of network equipment to the client assignment of internet protocol address of local area network (LAN).

Background technology

Because public internet protocol address (the Public Internet Protocol Address that general enterprise, focal pointe obtain to ISP (Internet Service Provider) purchase; Abbreviate the public IP address as) limited amount; In setting up local area network (LAN) (Local Area Network; Abbreviate LAN as) time; Be not sufficient to distribute to all clients and use, therefore the interior assigned IP address of client of local area network (LAN) all is to belong to private IP address (Private IP Address) at present.Private IP address can let enterprise, mechanism or household internal use voluntarily, and making has bigger elasticity when setting up local area network (LAN), but shortcoming is to use the client of private IP address can't directly connect the internet; The client of user on the internet in also can't the direct access local area network (LAN); Must carry out the conversion of privately owned/public IP address via the network address translation in the devices such as gateway or router (Network Address Translation is called for short NAT) mechanism; Just now can connecting wan (Wide Area Network; Like the internet, abbreviate WAN as), or service is provided to the user in the wide area network.

Yet NAT is still restriction to some extent in the use, and for example can't to let user and the client in the local area network (LAN) in the wide area network really set up point-to-point online for NAT, in addition, service quality of client (QoS) and fail safe etc. set also can thereby inefficacy.

Summary of the invention

In view of this, a kind of method of the client distributing IP address to local area network (LAN) need be provided and use the network equipment of this method, make client to select to use public IP address or private IP address according to the network environment demand of reality.

A kind of network equipment is used to connect the client host of a local area network (LAN) and the server of a wide area network, and wherein this network equipment comprises lan interfaces, Wide Area Network interface, package sending and receiving module and dynamic address allocation module.Lan interfaces connects this client host, and Wide Area Network interface connects this server.When the packet receiving and transmission module receives the Request Packet that obtains Internet Protocol address that client host transmitted from lan interfaces, transmit this Request Packet to Wide Area Network interface and give server, and wait for a scheduled time.If in the scheduled time scope, when Wide Area Network interface receives the answer package corresponding to this Request Packet, should reply package and be forwarded to lan interfaces to client host.If scheduled time mistake, not when Wide Area Network interface receives any answer package corresponding to this Request Packet, then the dynamic address allocation module starts an internet connection protocol server service, distributes a dynamic privately owned Internet Protocol address to give client host.

Preferably, this Request Packet comprises dhcp request package and Point-to-Point Protocol over Ethernet Request Packet.

Preferably, this answer package comprises that DHCP is replied package and Point-to-Point Protocol over Ethernet is replied package.

Preferably, if this client host receives this answer package of being transmitted by this network equipment, then this client host is assigned to a public internet protocol address.

Preferably, this internet connection protocol server service comprises Dynamic Host Configuration Protocol server service and Point-to-Point Protocol over Ethernet server service.

A kind of method with network equipment of the client host that connects local area network (LAN) and the ability of the server of wide area network to client host configuration Internet Protocol address, this method may further comprise the steps: reception from client host about the Request Packet that obtains Internet Protocol address and be forwarded to server; Wait for a scheduled time,, transmit and to reply package to this client host if in this scheduled time, receive from the answer package of server corresponding to this Request Packet; And, then start an internet connection protocol server service if this scheduled time crosses and do not receive from the answer package of server corresponding to this Request Packet, distribute a dynamic privately owned Internet Protocol address to give client host.

Preferably, this Request Packet comprises dhcp request package and Point-to-Point Protocol over Ethernet Request Packet.

Preferably, this answer package comprises that DHCP is replied package and Point-to-Point Protocol over Ethernet is replied package.

Preferably, if this client host receives this answer package from this server, then this client host is assigned to a public internet protocol address.

Preferably, this internet connection protocol server service comprises Dynamic Host Configuration Protocol server service and Point-to-Point Protocol over Ethernet server service.

Above-mentioned network equipment and make client to select to use public internet protocol address or privately owned Internet Protocol address according to the network environment demand of reality to the method for the client assignment of internet protocol address of local area network (LAN).

To the detailed description of embodiment and combine accompanying drawing, can understand the technique effect of foregoing and the present invention by following easily.

Description of drawings

Shown in Figure 1 for realizing an embodiment of network environment of the present invention therein.

Shown in Figure 2 is the module map of a kind of execution mode of network equipment of the present invention.

The flow chart that is the present invention's network equipment to a kind of execution mode of client host distributing IP address approach shown in Figure 3.

The flow chart that is the present invention's network equipment to a kind of execution mode of client host distributing IP address approach of support DHCP shown in Figure 4.

The flow chart that is the present invention's network equipment to a kind of execution mode of client host distributing IP address approach of support PPPoE shown in Figure 5.

The main element symbol description

Network equipment 10,100

Wide area network 20

Server 21

Local area network (LAN) 30

Client host 31,32,33

Processor 110

Internal memory 120

Timer module 130

LAN interface 140

Wan interface 150

Package sending and receiving module 160

Dynamic address allocation module 170

Address conversion module 180

Dynamic Host Configuration Protocol server 211

PPPoE server 212

PPTP server 213

Embodiment

The method of disclosed client distributing IP address to local area network (LAN) may be implemented in the various network equipment, has a network equipment that connects local area network (LAN) and wan feature such as router, gateway etc. are any.See also Fig. 1; Be depicted as the composition assembly of an embodiment that can realize network environment of the present invention therein; Comprise having thenetwork equipment 10 that connects local area network (LAN) 30 andwide area network 20 functions, theclient host 31 that is arranged in local area network (LAN) 30 can be positioned at the server 21 ofwide area network 20 1 ends vianetwork equipment 10 accesses toclient host 33.

See also Fig. 2, be depicted as the module map of a kind of execution mode of network equipment of the present invention,, only illustrate the part relevant with embodiment of the present invention for the ease of explanation.Network equipment 100 is a kind of execution mode of thenetwork equipment 10 shown in Fig. 1, and this network equipment 100 comprises at least one processor 110, internal memory 120, timer module 130, be used for connecting the LAN interface 140 of local area network (LAN) 30, be used for wan interface 150, package sending and receiving module 160, dynamic address allocation module 170 and the address conversion module 180 of connecting wan 20.Said module is can be by the performed software program with specific function of this processor 110, and these software programs are stored in internal memory 120, computer-readable storage media or other storage facilitiess.Processor 110 is used for carrying out package sending and receiving module 160, dynamic address allocation module 170 and address conversion module 180 and other is not in application program shown in Fig. 2 etc.Internal memory 120 is used for storing temporary data that package sending and receiving module 160, dynamic address allocation module 170, address conversion module 180 and other do not produce in the application programs code shown in Fig. 2, executive utility and other any data etc.Timer module 130 is carried out sequential via timing control like application programs such as package sending and receiving module 160, dynamic address allocation modules 170.LAN interface 140 comprises the entity port that plural number is supported the Ethernet package transmission, and wan interface 150 comprises at least one entity port of supporting the Ethernet package transmission.Wan interface 150 need be obtained the public IP address so that network equipment 100 become client host in the local area network (LAN) 30 (for example the client host shown in Fig. 1 31 toclient host 33 one of them or a plurality of) link the equipment of wide area network 20.In this implementation method; Wan interface 150 can be by DHCP (Dynamic Host Configuration Protocol; Abbreviate DHCP as), Point-to-Point Protocol over Ethernet (Point-to-Point Protocol over Ethernet; Abbreviate PPPoE as) or Point to Point Tunnel Protocol (Point to Point Tunneling Protocol; Abbreviate PPTP as) be connected with Dynamic Host Configuration Protocol server 211, PPPoE server 212 or PPTP server 213; Realize DHCP service, Point-to-Point Protocol over Ethernet service or Point to Point Tunnel Protocol service obtaining dynamic public IP address, or set up static public IP address on their own via processor 110 performed program codes.Wherein Dynamic Host Configuration Protocol server 211, PPPoE server 212 and PPTP server are the different embodiment of server 21.

Package sending and receiving module 160 is used to receive from the package of LAN interface 140 with wan interface 150; Also be used to transmit package to LAN interface 140 and wan interface 150; Be the IP package of private IP address or be the IP package of public IP address if package sending and receiving module 160 receives from LAN interface and source IP addresses, then this IP package is sent to the conversion that address conversion module 180 is carried out private IP address and public IP address from wan interface and purpose IP address; The internet connection protocol that dynamic address allocation module 170 is supported according to above-mentioned client host provides corresponding DHCP or PPPoE server service, so that distribute dynamic private IP address to give the above-mentioned client host of local area network (LAN) 30; Address conversion module 180 be used for in the package carry out privately owned/public IP address transition with the private IP address of above-mentioned client host in the local area network (LAN) 30 or the public IP address of wan interface 150, make above-mentioned client host can be connected to the server of WAN end and the service of using it to provide.

See also Fig. 3; Be depicted as the flow chart of the present invention's network equipment to a kind of execution mode of above-mentioned client host distributing IP address approach; This method is used for network equipment shown in Figure 2 100; After the above-mentioned client host start in the local area network (LAN) 30, use this method to confirm to distribute to the IP address of above-mentioned client host.

After the above-mentioned client host start (or the network on-line service starts) of local area network (LAN) 30,, send the package of the corresponding IP of obtaining Address requests according to the setting of its internet connection protocol; In step S310; When the package sending and receiving module 160 of network equipment 100 receives this package from LAN interface 140, and resolve and learn that this Request Packet content is for obtaining the IP Address requests, in step 320; Transmit this via wan interface 150 and obtain the server of IP Address requests package to the WAN end; The same time, the internet connection protocol that timer module 130 is supported according to client starts the predetermined WAN end server of receiving of a timer timing and replys the time range of package.In step S330, if package sending and receiving module 160 is in the time range of aforementioned setting, receive that coming from the WAN end obtains the answer package of IP Address requests package corresponding to this, then in step S340, transmit this answer package and hold to above-mentioned client host to LAN.If the setting-up time scope is mistake; Do not receive that any WAN of coming from end obtains the answer package of IP Address requests corresponding to this; Then shown in step S350; Via the server service of the internet connection protocol of supporting corresponding to above-mentioned client host in the dynamic address allocation module 170, distribute a dynamic private IP address to give above-mentioned client host.That is network equipment 100 can be attempted earlier letting above-mentioned client host obtain the public IP address via the internet connection protocol; Only if WAN end server does not have response, distribute dynamic private IP address to hold above-mentioned client host via the server service of building in the dynamic address allocation module just now to LAN.

The mode that above-mentioned client host obtains the public IP address can be based on DHCP or PPPoE; See also Fig. 4; The network equipment that is depicted as the present invention is to supporting to state on the DHCP flow chart of a kind of execution mode of client host distributing IP address approach; This method is used for network equipment shown in Figure 2 100, when after the above-mentioned client host start of supporting DHCP in the local area network (LAN) 30 or after starting the DHCP service, uses this method to confirm to distribute to the IP address of above-mentioned client host.

In step 410, when the package sending and receiving module 160 of network equipment 100 receives packages from LAN interface 140, and resolve and learn when this package is a DHCP DISCOVER package; In step 420; This DHCP DISCOVER package is forwarded to the server that WAN holds via wan interface 150, and the same time, timer module 130 starts the timing of scheduled times; The purpose of this timing is used for being set in the certain hour scope; Wait is from the answer of WAN end server for this DHCP DISCOVER package, and in other embodiment, aforementioned time range can be designed to different numerical.In step S430; If package sending and receiving module 160 is in the time range of aforementioned setting; This time range was four seconds in this execution mode; Receive from the DHCP OFFER package of wan interface 150, then in step S440, transmit this DHCP OFFER package to LAN interface 140 and give above-mentioned client host corresponding to this DHCP DISCOVER package.About the DHCP Request Packet with reply the corresponding of package, can by the DHCP Request Packet to come the source MAC and the target MAC (Media Access Control) address of dhcp reply package to do one corresponding.If the setting-up time scope is mistake; For example four second overtime do not receive any from the DHCP OFFER package of wan interface 150 corresponding to this DHCPDISCOVER package; Then shown in step S490; Start the Dynamic Host Configuration Protocol server service via dynamic address allocation module 170, distribute a dynamic private IP address to give above-mentioned client host.In other embodiments; Network equipment 100 can allow that LAN holds heavily sending of above-mentioned client host DHCPDISCOVER package; That is at the fixed time behind the scope overtime; Repeating step S410 and S420, and wait for scheduled time scope once more, avoid not receiving response from wan interface 150 because of factors such as network congestions.When network equipment 100 is transmitted DHCP OFFER package from wan interface 150 to LAN interface 140 likestep 440; Shown in step S450; Package sending and receiving module 160 will receive the DHCP REQUEST package from LAN interface 140, for accomplishing the configuration of above-mentioned client host public IP address, in step S460; Package sending and receiving module 160 is transmitted this DHCP REQUEST package to wan interface 150, and timer module 130 starts the timing of a scheduled time scope simultaneously.In this execution mode, this time range was 60 seconds, and in other embodiment, this time range can be set different numerical for.Among the step S470, if in 60 seconds, receive from the DHCP ACK package of wan interface 150 corresponding to this DHCPREQUEST package, then shown in step S480, the above-mentioned client host of LAN end successfully disposes a public IP address.Among the step S470; If the setting-up time scope is mistake; Like 60 seconds of overtime, do not receive from the DHCPACK package of wan interface 150, then shown in step S490 corresponding to this DHCP REQUEST package; Dynamic address allocation module 170 starts the Dynamic Host Configuration Protocol server service, distributes a dynamic private IP address to give this above-mentioned client host.

See also Fig. 5; The network equipment that is depicted as the present invention is to supporting to state on the PPPoE flow chart of a kind of execution mode of client host distributing IP address approach; This method is used for network equipment shown in Figure 2 100; When after the above-mentioned client host start of supporting PPPoE in the local area network (LAN) 30 or after using PPPoE to dial and connect service, use this method to confirm to distribute to the IP address of above-mentioned client host.

In step 510, when the package sending and receiving module 160 of network equipment 100 receives packages from LAN interface 140, and resolve and learn when this package is PPPoE Active Discovery Initiation (PADI) package; In step 520; This PADI package is forwarded to the server that WAN holds via wan interface 150, and the same time, timer module 130 starts the timing of scheduled times; The purpose of this timing is used for being set in the certain hour scope; Wait is from the answer of WAN end server for this PADI package, and in other embodiment, aforementioned time range can be designed to different numerical.In step S530; If package sending and receiving module 160 is in the time range of aforementioned setting; This time range was four seconds in this execution mode; Receive from PPPoE Active Discovery Offer (PADO) package of wan interface 150, then in step S540, transmit this PADO package to LAN interface 140 and give above-mentioned client host corresponding to this PADI package.About the PPPoE Request Packet with reply the corresponding of package, can by the PPPoE Request Packet to come the source MAC and the target MAC (Media Access Control) address of PPPoE answer package to do one corresponding.If the setting-up time scope is mistake; For example four second overtime do not receive any from the PADO package of wan interface 150 corresponding to this PADI package; Then shown in step S590; Start the PPPoE server service via dynamic address allocation module 170, distribute a dynamic private IP address to give above-mentioned client host.In other embodiments; Network equipment 100 can allow that LAN holds heavily sending of above-mentioned client host PADI package; That is at the fixed time behind the scope overtime; Repeating step S510 and S520, and wait for scheduled time scope once more, avoid not receiving response from wan interface 150 servers because of factors such as network are jammed.After network equipment 100 is transmitted PADO package to the LAN interface 140 from wan interface 150 like step 540; Shown in step S550; Package sending and receiving module 160 will receive the PADR package from LAN interface 140, for accomplishing the configuration of above-mentioned client host public IP address, in step S560; Package sending and receiving module 160 is transmitted this PADR package to wan interface 150, and timer module 130 starts the timing of a scheduled time scope simultaneously.In this execution mode, this time range was 60 seconds, and in other embodiment, this time range can be set different numerical for.Among the step S570; If in the scheduled time, for example receive in 60 seconds from the PADS package of wan interface 150, then shown in step S480 corresponding to this PADR package; The above-mentioned client host of LAN end successfully disposes a public IP address, and sets up general PPP session between WAN end server.Among the step S570; If the setting-up time scope is mistake; Like 60 seconds of overtime, do not receive from PPPoE Active Discovery Session-confirmation (PADS) package of wan interface 150, then shown in step S590 corresponding to this PADR package; Dynamic address allocation module 170 starts the PPPoE server service, distributes a dynamic private IP address to give this above-mentioned client host.

As previously mentioned, dynamic address allocation module 170 can comprise different server services, specifically adopts which kind of server service, looks above-mentioned client hosts in the local area network (LAN) 30 and adopts which kind of internet online setting and decide.To the above-mentioned client host that adopts the DHCP mode, dynamic address allocation module 170 can start the Dynamic Host Configuration Protocol server service; To the above-mentioned client host that adopts PPP over Ethernet, the dynamic assignment module can start the PPPoE server service.In summary, above-mentioned client host IP distribution method proposed by the invention is applicable to that various tools connect the network equipment of ability of server of above-mentioned client host and the wan side of local area network (LAN) ends, comprises but is not limited to router and gateway.

Claims (10)

Translated fromChinese

1.一种网络装置，用于连接一局域网的客户端主机与一广域网的服务器，其特征在于，该网络装置包括：1. A network device for connecting a client host of a local area network and a server of a wide area network, characterized in that the network device comprises:局域网接口，用于连接该客户端主机；LAN interface, used to connect the client host;广域网接口，用于连接该服务器；A wide area network interface for connecting to the server;封包收送模块，用于从该局域网接口接收该客户端主机所传送之获取因特网协议地址的请求封包，将该请求封包转发至该服务器，并当从广域网接口接收来自该服务器所传送对应于该请求封包的回复封包时，将该回复封包转发至该客户端主机；及The packet sending module is used to receive the request packet for obtaining the Internet protocol address sent by the client host from the LAN interface, forward the request packet to the server, and receive the request packet corresponding to the IP address sent by the server from the WAN interface. forwarding the reply packet to the client host when requesting a reply packet of the packet; and动态地址分配模块，用于在等待一预定时间后该封包收送模块未从该广域网接口接收到该回复封包时，启动一因特网连接协议服务器服务，以分配动态私有因特网协议地址给该客户端主机。The dynamic address assignment module is used to start an Internet connection protocol server service when the packet sending module does not receive the reply packet from the wide area network interface after waiting for a predetermined time, so as to assign a dynamic private Internet protocol address to the client host .2.如权利要求1所述之网络装置，其特征在于，该请求封包包括动态主机配置协议请求封包及以太网点对点协议请求封包。2. The network device according to claim 1, wherein the request packet comprises a Dynamic Host Configuration Protocol request packet and an Ethernet Point-to-Point Protocol request packet.3.如权利要求1所述之网络装置，其特征在于，该回复封包包括动态主机配置协议回复封包及以太网点对点协议回复封包。3. The network device according to claim 1, wherein the reply packet comprises a Dynamic Host Configuration Protocol reply packet and an Ethernet P2P reply packet.4.如权利要求1所述之网络装置，其特征在于，若该客户端主机接收到由该网络装置所转发的该回复封包，则该客户端主机分配到一公用因特网协议地址。4. The network device as claimed in claim 1, wherein if the client host receives the reply packet forwarded by the network device, the client host is assigned a public IP address.5.如权利要求1所述之网络装置，其特征在于，该因特网连接协议服务器服务包括动态主机配置协议服务器服务及以太网点对点协议服务器服务。5. The network device as claimed in claim 1, wherein the Internet Connection Protocol server service comprises a Dynamic Host Configuration Protocol server service and an Ethernet Point-to-Point Protocol server service.6.一种对客户端分配因特网协议地址的方法，该客户端主机位于局域网中，该方法执行于一具有连接该客户端主机与广域网的服务器之能力的网络装置中，其特征在于，该方法包括以下步骤：6. A method for assigning an Internet protocol address to a client, the client host is located in a local area network, the method is executed in a network device with the ability to connect the client host and a server of the wide area network, it is characterized in that the method Include the following steps:接收来自该客户端主机关于获取因特网协议地址的请求封包，转发该请求封包至该服务器；receiving a request packet from the client host for obtaining an IP address, and forwarding the request packet to the server;等待一预定时间，若于该预定时间内接收来自该服务器对应于该请求封包的回复封包，转发该回复封包至该客户端主机；及Waiting for a predetermined time, if receiving a reply packet corresponding to the request packet from the server within the predetermined time, forwarding the reply packet to the client host; and若该预定时间已过且未接收来自该服务器对应于该请求封包的回复封包，则启动一因特网连接协议服务器服务，以分配一动态私有因特网协议地址给该客户端主机。If the predetermined time has elapsed and no reply packet corresponding to the request packet is received from the server, an Internet connection protocol server service is started to assign a dynamic private Internet protocol address to the client host.7.如权利要求6所述之对客户端分配因特网协议地址的方法，其特征在于，该请求封包包括动态主机配置协议请求封包及以太网点对点协议请求封包。7. The method for assigning an IP address to a client according to claim 6, wherein the request packet includes a Dynamic Host Configuration Protocol request packet and an Ethernet Point-to-Point Protocol request packet.8.如权利要求6所述之对客户端分配因特网协议地址的方法，其特征在于，该回复封包包括动态主机配置协议回复封包及以太网点对点协议回复封包。8. The method for assigning an IP address to a client according to claim 6, wherein the reply packet includes a Dynamic Host Configuration Protocol reply packet and an Ethernet P2P reply packet.9.如权利要求6所述之对客户端分配因特网协议地址的方法，其特征在于，若该客户端主机接收到来自该服务器的该回复封包，则该客户端主机分配到一公用因特网协议地址。9. The method for assigning an IP address to a client as claimed in claim 6, wherein if the client host receives the reply packet from the server, the client host is assigned a public IP address .10.如权利要求6所述之对客户端分配因特网协议地址的方法，其特征在于，该因特网连接协议服务器服务包括动态主机配置协议服务器服务及以太网点对点协议服务器服务。10. The method for assigning an Internet Protocol address to a client according to claim 6, wherein the Internet Connection Protocol server service includes a Dynamic Host Configuration Protocol server service and an Ethernet Point-to-Point Protocol server service.

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