CN102469175A - Network device and method for distributing Internet protocol address to client - Google Patents
Network device and method for distributing Internet protocol address to client Download PDFInfo
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- CN102469175A CN102469175A CN2010105474330A CN201010547433A CN102469175A CN 102469175 A CN102469175 A CN 102469175A CN 2010105474330 A CN2010105474330 A CN 2010105474330A CN 201010547433 A CN201010547433 A CN 201010547433A CN 102469175 A CN102469175 A CN 102469175A
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Abstract
The invention relates to a network device and a method for distributing an Internet protocol address to a client. The method comprises the following steps of: sending a request packet on acquiring the Internet protocol address to the network device by the client; transmitting the request packet to a wide area network after receiving the request packet by the network device; if a reply packet corresponding to the request packet is received from the wide area network by the network device within pre-set time, transmitting the reply packet to the client of a local area network; and if no reply packet corresponding to the request packet from the wide area network is received after the pre-set time, starting an Internet connection protocol server service by the network device, and distributing a dynamic private Internet protocol address to the client of the local area network by the server. With the adoption of the network device and the method for distributing the Internet protocol address to the client, provided by the invention, the client can select the public Internet protocol address or the private Internet protocol address according to a real network environment.
Description
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
Server 21
Local area network (LAN) 30
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 the network equipment 10 that connects local area network (LAN) 30 and wide area network 20 functions, the client host 31 that is arranged in local area network (LAN) 30 can be positioned at the server 21 of wide area network 20 1 ends via network equipment 10 accesses to client 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 the network 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 to client 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 like step 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)
1. a network equipment is used to connect the client host of a local area network (LAN) and the server of a wide area network, it is characterized in that this network equipment comprises:
Lan interfaces is used to connect this client host;
Wide Area Network interface is used to connect this server;
Package sending and receiving module; Be used for receiving the Request Packet that obtains Internet Protocol address that this client host transmitted from this lan interfaces; This Request Packet is forwarded to this server; And when receiving from the transmission of this server from Wide Area Network interface, should reply package and be forwarded to this client host corresponding to the answer package of this Request Packet; And
The dynamic address allocation module; Be used for waiting for after the scheduled time that this package sending and receiving module is not when this Wide Area Network interface receives this answer package; Start an internet connection protocol server service, give this client host to distribute dynamic privately owned Internet Protocol address.
2. according to claim 1 network equipment is characterized in that this Request Packet comprises dhcp request package and Point-to-Point Protocol over Ethernet Request Packet.
3. according to claim 1 network equipment is characterized in that, this answer package comprises that DHCP is replied package and Point-to-Point Protocol over Ethernet is replied package.
4. according to claim 1 network equipment is characterized in that, 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.
5. according to claim 1 network equipment is characterized in that this internet connection protocol server service comprises Dynamic Host Configuration Protocol server service and Point-to-Point Protocol over Ethernet server service.
6. method to client assignment of internet protocol address; This client host is arranged in local area network (LAN); This method is executed in one to be had in the network equipment of ability of the server that connects this client host and wide area network, it is characterized in that this method may further comprise the steps:
Reception about obtaining the Request Packet of Internet Protocol address, is transmitted this Request Packet to this server from this client host;
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 this server corresponding to this Request Packet; And
If this scheduled time crosses and does not receive from the answer package of this server corresponding to this Request Packet, then start an internet connection protocol server service, give this client host to distribute a dynamic privately owned Internet Protocol address.
7. the method to client assignment of internet protocol address of claim 6 is characterized in that this Request Packet comprises dhcp request package and Point-to-Point Protocol over Ethernet Request Packet.
8. the method to client assignment of internet protocol address of claim 6 is characterized in that, this answer package comprises that DHCP is replied package and Point-to-Point Protocol over Ethernet is replied package.
9. the method to client assignment of internet protocol address of claim 6 is characterized in that, if this client host receives this answer package from this server, then this client host is assigned to a public internet protocol address.
10. the method to client assignment of internet protocol address of claim 6 is characterized in that this internet connection protocol server service comprises Dynamic Host Configuration Protocol server service and Point-to-Point Protocol over Ethernet server service.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105474330A CN102469175A (en) | 2010-11-16 | 2010-11-16 | Network device and method for distributing Internet protocol address to client |
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| CN2010105474330A CN102469175A (en) | 2010-11-16 | 2010-11-16 | Network device and method for distributing Internet protocol address to client |
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Application publication date: 20120523 |