CN103987098A - Method and system for switching between IPV4 network and IPV6 network - Google Patents
Method and system for switching between IPV4 network and IPV6 network Download PDFInfo
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Abstract
The invention discloses a method and system for switching between the IPV4 network and the IPV6 network. The method includes the steps of detecting whether the condition for switching from the first network to the second network is met or not, wherein the first network and the second network are different networks in the IPV4 network and the IPV6 network; if yes, enabling a second network card which is in the idle state on a mobile node to have access to the second network; switching the mobile node from a first network card to the second network card so that the mobile node can conduct communication through the second network. By means of the method and the system, without interrupting communication with a communication terminal does not need to be interrupted or conducting protocol conversion, heterogeneous network switching can be achieved, communication time delay can be reduced, and communication efficiency and communication quality can be improved.
Description
Technical field
The present invention relates to network communications technology field, particularly relate to a kind of IPV4 network and the internetwork changing method of IPV6 and system.
Background technology
Along with the development of network technology and the expansion of network size, IPV4 (Internet protocol Internet Protocol the 4th edition) can not meet the requirement of network Development.Can provide huge address space, and it is more and more wider to have the application of IPV6 (sixth version of Internet protocol Internet Protocol) of the not available new features of many IPV4.
The extensive use of IPV6 inevitably need be switched mobile node between IPV4 network and IPV6 network.Current changing method is: mobile node is in IPV4 network during accesses network, by the dns server of IPV4 network, distribute to IPV4 address of this mobile node, and in this network, set up a home agent, record the domain name of this mobile node and the mapping of address.When mobile node moves in IPV6 network, in IPV6 network, dns server sends a request that comprises this node domain name by gateway, when this request message arrives the home agent of this node, return to a response message that comprises this mobile node IPV4 address.When this response message passes through gateway, by this IPV4 address transition, be IPV6 address, and distribute to this mobile node.This mobile node is just used this IPV6 address access IPV6 network.Otherwise, when mobile node is switched to IPV4 network from IPV6 network, use identical mechanism, obtain its IPV4 address.
But above-mentioned changing method is larger while carrying out network handover delay between IPV4 network and IPV6 network, affects real time communication quality and efficiency.
Summary of the invention
Based on this, larger while being necessary to carry out network handover delay for above-mentioned changing method between IPV4 network and IPV6 network, affect the problem of real time communication quality and efficiency, a kind of IPV4 network and the internetwork changing method of IPV6 and system are provided.
The internetwork changing method of IPV4 network and IPV6, comprises the following steps:
Detect and whether meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node;
If meet, the second network interface card in idle state on described mobile node is accessed to described second network, wherein, described the second network interface card is supported the procotol of described second network;
Described mobile node is switched to described the second network interface card from described the first network interface card, described mobile node is communicated by described second network.
The internetwork switched system of IPV4 network and IPV6, comprising:
Detection module, for detection of whether, meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node;
Communication module, for when meeting described network switching condition, accesses described second network by the second network interface card in idle state on described mobile node, and wherein, described the second network interface card is supported the procotol of described second network;
Handover module, for described mobile node is switched to described the second network interface card from described the first network interface card, makes described mobile node communicate by described second network.
The internetwork changing method of above-mentioned IP V4 network and IPV6 and system, two network interface cards based on supporting respectively IPV4 network and IPV6 network, when meeting network switching condition, the second network interface card in idle state on mobile node is accessed to described second network, then described mobile node is switched to described the second network interface card from accessing the first network interface card of described first network, without interrupting with the communicating by letter of communication terminal, without carrying out protocol conversion, can realize heterogeneous network switches, communication delay be can reduce, communication efficiency and communication quality improved.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of IPV4 network of the present invention and internetwork changing method the first execution mode of IPV6;
The schematic flow sheet of Fig. 2 IPV4 network of the present invention and internetwork changing method the second execution mode of IPV6;
Fig. 3 is the structural representation of IPV4 network of the present invention and internetwork switched system the first execution mode of IPV6;
Fig. 4 is the structural representation of IPV4 network of the present invention and internetwork switched system the second execution mode of IPV6.
Embodiment
Refer to Fig. 1, the schematic flow sheet of Fig. 1 IPV4 network of the present invention and internetwork changing method the first execution mode of IPV6.
IPV4 network described in present embodiment and the internetwork changing method of IPV6, comprise the following steps:
Step 101, detect and whether meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node.
Step 102, if meet, accesses described second network by the second network interface card in idle state on described mobile node, and wherein, described the second network interface card is supported the procotol of described second network.
Step 103, is switched to described the second network interface card by described mobile node from described the first network interface card, and described mobile node is communicated by described second network.
IPV4 network described in present embodiment and the internetwork changing method of IPV6, two network interface cards based on supporting respectively IPV4 network and IPV6 network, when meeting network switching condition, the second network interface card in idle state on mobile node is accessed to described second network, then described mobile node is switched to described the second network interface card from accessing the first network interface card of described first network, without interrupting with the communicating by letter of communication terminal, without carrying out protocol conversion, can realize heterogeneous network switches, communication delay be can reduce, communication efficiency and communication quality improved.
Wherein, for step 101, when described first network is IPV4 network, described second network is IPV6 network, and when described first network is IPV6 network, described second network is IPV4 network.
Preferably, described network switching condition is corresponding to the communication link quality of the network in the region of living in of described mobile node, communication link quality parameter or communication quality threshold value in the communication link quality parameter of described first network (Current Communication Network network) lower than described second network, or the communication link quality parameter of described second network is higher than communication link quality parameter or the communication quality threshold value of described first network, or described mobile node is while moving to the network area of described second network, meets described network switching condition.
In one embodiment, the step that whether described detection meets the network switching condition from first network to second network comprises the following steps:
Obtain the communication link quality parameter of described second network, if described communication link quality parameter, higher than communication quality threshold value, is judged the network switching condition meeting from first network to second network.
Preferably, when mobile node carries out transfer of data with communication terminal by the first network interface card on the wireless link of setting up, the switching network interface card of another free time (the second network interface card) detects the communication link quality of the access point of second network, for determining whether that meeting network switching condition provides decision information.
Further, obtain the communication link quality parameter of described second network, if described communication link quality parameter higher than communication quality threshold value, judges that the step that meets the network switching condition from first network to second network can comprise the following steps:
By described the second network interface card, obtain the signal strength signal intensity of the access point of described second network.
The signal strength signal intensity of relatively obtaining and signal threshold value, if the signal strength signal intensity of obtaining, higher than signal threshold value, is judged the network switching condition meeting from first network to second network.
In other embodiments, also can by other equipment, obtain other communication link quality parameters of described second network, determine whether and meet network switching condition.
In another embodiment, the step that whether described detection meets the network switching condition from first network to second network comprises the following steps:
Detect the network area whether described mobile node moves to described second network.
If so, judge the network switching condition meeting from first network to second network.
For step 102, described idle state is preferably network interface card not for connecting the state of map network and described mobile node, between map network and described mobile node, does not carry out data communication.When described the second network interface card is during in idle state, described the first network interface card accesses described first network, and described mobile node is connected with described the first network interface card, by described first network and communication terminal, communicates.
Preferably, can to the access point of described second network, send and comprise and the access request that accesses password described the second network interface card is accessed to described second network by described the second network interface card.Also can described the second network interface card be accessed to described second network by the habitual access way of those skilled in the art.
In one embodiment, can configure by the building method of EUI-64 the internet protocol address (as IP address) of the corresponding first network of described the first network interface card and the corresponding second network of described the second network interface card, respectively the internet protocol address in first network and second network as mobile node.
In other embodiments, can access after map network at network interface card, by DHCP (Dynamic Host Configuration Protocol, DHCP) server distributes automatically, obtains the internet protocol address (as IP address) of described the first network interface card or described the second network interface card.That is: when mobile node passes through IPV4 network interface card access network, the Dynamic Host Configuration Protocol server in IPV4 network is that corresponding network interface card distributes an IPV4 address (first network protocol address or second network protocol address) automatically.Accordingly, when mobile node moves in IPV6 network, switch while using IPV6 network interface card to communicate, the Dynamic Host Configuration Protocol server in IPV6 network is that corresponding network interface card distributes an IPV6 address (second network protocol address or first network protocol address) automatically.
For step 103, at described mobile node, from described the first network interface card is switched to described the second network interface card, described the first network interface card is in idle state.
Preferably, carry out network interface card while switching, can connect being connected between described mobile node and described the second network interface card, forbidding being connected between described mobile node and described the first network interface card.
Refer to Fig. 2, Fig. 2 is the schematic flow sheet of IPV4 network of the present invention and internetwork changing method the second execution mode of IPV6.
The difference of the IPV4 network described in present embodiment and the internetwork changing method of IPV6 and the first execution mode is: the described step that the second network interface card in idle state on mobile node is accessed to described second network comprises the following steps:
Step 201, the access point transmission access request by described the second network interface card to described second network, accesses described second network by described the second network interface card.
Step 202, name server to described second network sends the second network protocol address of described the second network interface card and the domain name of described mobile node, and sets up the domain name of described mobile node and the mapping between described second network protocol address at domain name server.
Step 203, to sending the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card for connecting the Interworking gateway of described first network and described second network, at described Interworking gateway, set up the mapping between described first network protocol address and described second network protocol address.
The IPV4 network of present embodiment and the internetwork changing method of IPV6, after access second network, set up corresponding mapping relations at name server and Interworking gateway, can guarantee that subsequent communications is smooth and easy, improve the communication efficiency after network switches.
Wherein, for step 201, described access request preferably includes access password.
In one embodiment, the access point transmission access request by described the second network interface card to described second network, the step that described the second network interface card is accessed to described second network can comprise the following steps:
Described the second network interface card comprises to the access point transmission of described second network the access request that accesses password.
Described access node is verified described access password, responds described access request described the second network interface card is accessed to described second network when described access password is correct.
For step 202, the address of the second network protocol address of described the second network interface card is preferably described the second network interface card and accesses after described second network, DHCP (Dynamic Host Configuration Protocol, DHCP) server is distributed to the internet protocol address of described the second network interface card automatically.
In one embodiment, to described interactive gateway, send the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card, the step of setting up the mapping between described first network protocol address and described second network protocol address at described Interworking gateway can comprise the following steps:
Described the second network interface card sends the domain name of second network protocol address and described mobile node to the access point of described second network.
Described access point is forwarded to the domain name of the described second network protocol address receiving and described mobile node the name server of described second network.
Domain name server is set up the mapping between the domain name of described second network protocol address and described mobile node, and storage.
For step 203, the first network protocol address of described the first network interface card can be stored in the storage area of described mobile node.
Preferably, to described interactive gateway, send the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card, the step of setting up the mapping between described first network protocol address and described second network protocol address at described Interworking gateway can comprise the following steps:
Described the second network interface card sends the first network protocol address of described second network protocol address and described the first network interface card to the access point of described second network.
Described access point is forwarded to described Interworking gateway by described second network protocol address and described first network protocol address.
Described interactive gateway is set up the mapping between described first network protocol address and described second network protocol address, and storage.
Further, after establishing above-mentioned mapping, described mobile node and communication terminal can carry out data communication according to above-mentioned mapping and second network.
In one embodiment, by described mobile node from accessing after the first network interface card of described first network is switched to the step of described the second network interface card, comprise the following steps:
Communication terminal in described first network sends domain name request to described Interworking gateway, and wherein, domain name request comprises described first network protocol address.
Described Interworking gateway, according to the mapping relations between described first network protocol address and described second network protocol address, sends the second network protocol address of described the first network interface card to described communication terminal.
Described communication terminal receives described second network protocol address, and according to described second network protocol address, described mobile node is conducted interviews.
The present embodiment, the communication terminal that can be used for realizing in described first network by described second network is visited the access to described mobile node.
When described mobile node re-moves after described first network, preferably, communication terminal in first network can obtain the first network protocol address of described the first network interface card of redistributing from the name server in first network, communicate with described mobile node.
In another embodiment, by described mobile node after described network interface card is switched to the step of described the second network interface card, further comprising the steps of:
The access point of described mobile node by described the second network interface card and described second network sends domain name request to the name server of described second network, and wherein, domain name request comprises the domain name of the communication terminal of described first network.
The first network protocol address of described communication terminal is obtained in the name server response domain name request of described second network from the name server of described first network by described Interworking gateway, and be sent to described mobile node.
Described mobile node receives the first network protocol address of described communication terminal, and according to the first network protocol address of described communication terminal, described communication terminal is conducted interviews.
The present embodiment, can be used for realizing by described second network the access that described mobile node is visited the communication terminal in described first network.
In other embodiments, while configuring the internet protocol address (as IP address) of described the first network interface card and described the second network interface card by the building method of EUI-64, at described the first network interface card, access after described first network, without the mapping of setting up at domain name server and described Interworking gateway between the domain name of second network protocol address and described mobile node, also without the mapping of setting up at described Interworking gateway between described first network protocol address and described second network protocol address.
Refer to Fig. 3, the structural representation of Fig. 3 IPV4 network of the present invention and internetwork switched system the first execution mode of IPV6.
IPV4 network described in present embodiment and the internetwork switched system of IPV6, comprise detection module 400, communication module 500 and handover module 600, wherein:
Detection module 400, for detection of whether, meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node.
Communication module 500, for when meeting described network switching condition, accesses described second network by the second network interface card in idle state on described mobile node, and wherein, described the second network interface card is supported the procotol of described second network.
Handover module 600, for described mobile node is switched to described the second network interface card from described the first network interface card, makes described mobile node communicate by described second network.
IPV4 network described in present embodiment and the internetwork switched system of IPV6, two network interface cards based on supporting respectively IPV4 network and IPV6 network, when meeting network switching condition, the second network interface card in idle state on mobile node is accessed to described second network, then described mobile node is switched to described the second network interface card from accessing the first network interface card of described first network, without interrupting with the communicating by letter of communication terminal, without carrying out protocol conversion, can realize heterogeneous network switches, communication delay be can reduce, communication efficiency and communication quality improved.
Wherein, for detection module 400, when described first network is IPV4 network, described second network is IPV6 network, and when described first network is IPV6 network, described second network is IPV4 network.
Preferably, described network switching condition is corresponding to the communication link quality of the network in the region of living in of described mobile node, communication link quality parameter or communication quality threshold value in the communication link quality parameter of described first network (Current Communication Network network) lower than described second network, or the communication link quality parameter of described second network is higher than communication link quality parameter or the communication quality threshold value of described first network, or described mobile node is while moving to the network area of described second network, meets described network switching condition.
In one embodiment, detection module 400 can be used for obtaining the communication link quality parameter of described second network, if described communication link quality parameter, higher than communication quality threshold value, is judged the network switching condition meeting from first network to second network.
Preferably, when mobile node can carry out transfer of data with communication terminal by the first network interface card on the wireless link of setting up, the switching network interface card of another free time (the second network interface card of idle state) detects the communication link quality of the access point of second network, for determining whether that meeting network switching condition provides decision information.
Further, the second network interface card also can be used for obtaining the signal strength signal intensity of the access point of described second network, detection module 400 is also for receiving described signal strength signal intensity, and more described signal strength signal intensity and signal threshold value, in described signal strength signal intensity, judge the network switching condition meeting from first network to second network during higher than described signal threshold value.
In other embodiments, also can by other equipment, obtain other communication link quality parameters of described second network, determine whether and meet network switching condition.
In another embodiment, detection module 400 also can be further used for detecting the network area whether described mobile node moves to described second network, if so, judges the network switching condition meeting from first network to second network.
For communication module 500, described idle state is preferably the first network interface card or the second network interface card not for connecting the state of map network and described mobile node, between map network and described mobile node, does not carry out data communication.When the second network interface card is during in idle state, the first network interface card accesses described first network, and mobile node is connected with the first network interface card, by described first network and communication terminal, communicates.
Preferably, can to the access point of described second network, send and comprise and the access request that accesses password the second network interface card is accessed to described second network by the second network interface card.Also can the second network interface card be accessed to described second network by the habitual access way of those skilled in the art.
In one embodiment, can configure by the building method of EUI-64 the internet protocol address (as IP address) of the corresponding first network of described the first network interface card and the corresponding second network of described the second network interface card, respectively the internet protocol address in first network and second network as mobile node.
In other embodiments, can access after map network at network interface card, by DHCP (Dynamic Host Configuration Protocol, DHCP) server, automatically distribute, obtain the internet protocol address (as IP address) of the first network interface card or the second network interface card.That is: when mobile node passes through IPV4 network interface card access network, the Dynamic Host Configuration Protocol server in IPV4 network is that corresponding network interface card distributes an IPV4 address (first network protocol address or second network protocol address) automatically.Accordingly, when mobile node moves in IPV6 network, switch while using IPV6 network interface card to communicate, the Dynamic Host Configuration Protocol server in IPV6 network is that corresponding network interface card distributes an IPV6 address (second network protocol address or first network protocol address) automatically.
In another embodiment, communication module 500 also can be used for:
Access point transmission access request by from described the second network interface card to described second network, accesses described second network by described the second network interface card;
Name server to described second network sends the second network protocol address of described the second network interface card and the domain name of described mobile node, and sets up the domain name of described mobile node and the mapping between described second network protocol address at domain name server;
To sending the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card for connecting the Interworking gateway of described first network and described second network, at described Interworking gateway, set up the mapping between described first network protocol address and described second network protocol address.
For handover module 600, at mobile node, from the first network interface card is switched to the second network interface card, the first network interface card is in idle state.
Preferably, carry out network interface card while switching, can connect being connected between mobile node and the second network interface card, forbidding being connected between described mobile node and the first network interface card.
Refer to Fig. 4, Fig. 4 is the structural representation of IPV4 network of the present invention and internetwork switched system the second execution mode of IPV6.
IPV4 network described in present embodiment is with the difference of the first execution mode with the internetwork switched system of IPV6: can comprise name server A, the access point C of IPV4 network, IPV6 network, IPV4 network, name server B, the access point D of IPV6 network, the Interworking gateway 700 that is connected IPV6 network and IPV4 network and Interworking gateway 800.Interworking gateway 800 is preferably the NAT-PT gateway with DNS-ALG.
When by the second network interface card access IPV6 network, the second network interface card sends and comprises that the access request that accesses password, access point respond described access request by the second network interface card access IPV6 network for the access point D to IPV6 network.Described access request preferably includes since it is so password.
After the second network interface card access IPV6 network, in one embodiment:
The second network interface card sends the domain name of second network protocol address and mobile node 300 to the access point D of IPV6 network.
Access point D is forwarded to the domain name of the described second network protocol address second network protocol address receiving and mobile node 300 the name server B of IPV6 network.
Name server B sets up the mapping between the domain name of described second network protocol address and mobile node 300, and storage.
After the second network interface card access IPV6 network, in another embodiment:
The second network interface card sends the first network protocol address of described second network protocol address and the first network interface card to the access point D of IPV6 network.
Access point D is forwarded to Interworking gateway 700 by described second network protocol address and described first network protocol address.
Interactive gateway 700 is set up the mapping between described first network protocol address and described second network protocol address, and storage.
Preferably, the second network protocol address of the second network interface card is preferably the second network interface card and accesses after described second network, DHCP (Dynamic Host Configuration Protocol, DHCP) server is distributed to the internet protocol address of the second network interface card automatically.The first network protocol address of the first network interface card can be stored in the storage area of mobile node 300.
Further, after establishing above-mentioned mapping, mobile node 300 and communication terminal 800 can carry out data communication according to above-mentioned mapping and IPV6 network.
When the communication terminal 800 in IPV4 network need to be accessed mobile node 300, communication terminal 800 sends domain name request to Interworking gateway 700, and wherein, domain name request comprises the first network protocol address of the first network interface card.Interworking gateway 700, according to the mapping relations between described first network protocol address and described second network protocol address, sends described second network protocol address to communication terminal 800.Communication terminal 800 receives described second network protocol address, and the access to mobile node 300 according to described second network protocol address.
When mobile node 300 re-moves after IPV4 network, preferably, the communication terminal 800 in IPV4 network can obtain the first network protocol address of the first network interface card of redistributing from the name server A in IPV4 network, communicate with mobile node 300.
During communication terminal 800 in mobile node 300 need to be accessed IPV4 network, mobile node passes through the access point D of the second network interface card and IPV6 network to the name server B transmission domain name request of described IPV6 network, wherein, domain name request comprises the domain name of the communication terminal 800 of described first network.The name server B response domain name request of IPV6 network is the first network protocol address from the name server A obtaining communication terminal 800 of IPV4 network by Interworking gateway 700, and is sent to mobile node 300.The first network protocol address of mobile node 300 received communication terminals 800, and according to the first network protocol address of communication terminal 800, communication terminal 800 is conducted interviews.In other embodiments, while configuring the internet protocol address (as IP address) of the first network interface card and the second network interface card by the building method of EUI-64, at the first network interface card, access after described IPV6 network, without the mapping of setting up at name server B and Interworking gateway 700 between the domain name of second network protocol address and mobile node 300, also without the mapping of setting up at Interworking gateway 700 between described first network protocol address and described second network protocol address.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the internetwork changing method of IPV4 network and IPV6, is characterized in that, comprises the following steps:
Detect and whether meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node;
If meet, the second network interface card in idle state on described mobile node is accessed to described second network, wherein, described the second network interface card is supported the procotol of described second network;
Described mobile node is switched to described the second network interface card from described the first network interface card, described mobile node is communicated by described second network.
2. IPV4 network according to claim 1 and the internetwork changing method of IPV6, is characterized in that, the step whether described detection meets the network switching condition from first network to second network comprises the following steps:
Obtain the communication link quality parameter of described second network, if described communication link quality parameter, higher than communication quality threshold value, is judged the network switching condition meeting from first network to second network.
3. IPV4 network according to claim 2 and the internetwork changing method of IPV6, it is characterized in that, obtain the communication link quality parameter of described second network, if described communication link quality parameter higher than communication quality threshold value, judges that the step that meets the network switching condition from first network to second network comprises the following steps:
By described the second network interface card, obtain the signal strength signal intensity of the access point of described second network;
The signal strength signal intensity of relatively obtaining and signal threshold value, if the signal strength signal intensity of obtaining, higher than signal threshold value, is judged the network switching condition meeting from first network to second network.
4. IPV4 network according to claim 1 and the internetwork changing method of IPV6, is characterized in that, the step whether described detection meets the network switching condition from first network to second network comprises the following steps:
Detect the network area whether described mobile node moves to described second network;
If so, judge the network switching condition meeting from first network to second network.
5. IPV4 network according to claim 1 and the internetwork changing method of IPV6, is characterized in that, the step that the second network interface card in idle state on described mobile node is accessed to described second network comprises the following steps:
Access point transmission access request by from described the second network interface card to described second network, accesses described second network by described the second network interface card;
Name server to described second network sends the second network protocol address of described the second network interface card and the domain name of described mobile node, and sets up the domain name of described mobile node and the mapping between described second network protocol address at domain name server;
To sending the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card for connecting the Interworking gateway of described first network and described second network, at described Interworking gateway, set up the mapping between described first network protocol address and described second network protocol address.
6. IPV4 network according to claim 5 and the internetwork changing method of IPV6, is characterized in that, by described mobile node after described the first network interface card is switched to the step of described the second network interface card, comprise the following steps:
Communication terminal in described first network sends domain name request to described Interworking gateway, and wherein, domain name request comprises the first network protocol address of described the first network interface card;
Described Interworking gateway, according to the mapping relations between described first network protocol address and described second network protocol address, sends described second network protocol address to described communication terminal;
Described communication terminal receives described second network protocol address, and according to described second network protocol address, described mobile node is conducted interviews.
7. IPV4 network according to claim 5 and the internetwork changing method of IPV6, is characterized in that, by described mobile node after described the first network interface card is switched to the step of described the second network interface card, further comprising the steps of:
The access point of described mobile node by described the second network interface card and described second network sends domain name request to the name server of described second network, and wherein, domain name request comprises the domain name of the communication terminal in described first network;
The first network protocol address of described communication terminal is obtained in the name server response domain name request of described second network from the name server of described first network by described Interworking gateway, and be sent to described mobile node;
Described mobile node receives the first network protocol address of described communication terminal, and according to the first network protocol address of described communication terminal, described communication terminal is conducted interviews.
8. the internetwork switched system of IPV4 network and IPV6, is characterized in that, comprising:
Detection module, for detection of whether, meet the network switching condition from first network to second network, wherein, described first network is in IPV4 network and IPV6 network one time, described second network be in IPV4 network and IPV6 network another, described first network is for being connected with supporting the first network interface card of the procotol of described first network on mobile node;
Communication module, for when meeting described network switching condition, accesses described second network by the second network interface card in idle state on described mobile node, and wherein, described the second network interface card is supported the procotol of described second network;
Handover module, for described mobile node is switched to described the second network interface card from described the first network interface card, makes described mobile node communicate by described second network.
9. IPV4 network according to claim 8 and the internetwork switched system of IPV6, it is characterized in that, described detection module is also for receiving the signal strength signal intensity of described second network, and more described signal strength signal intensity and signal threshold value, in described signal strength signal intensity, judge the network switching condition meeting from first network to second network during higher than described signal threshold value, wherein, described signal strength signal intensity is the signal strength signal intensity of the access point of the described second network that detects of described the second network interface card.
10. IPV4 network according to claim 8 and the internetwork switched system of IPV6, is characterized in that, described communication module also for:
Access point transmission access request by from described the second network interface card to described second network, accesses described second network by described the second network interface card;
Name server to described second network sends the second network protocol address of described the second network interface card and the domain name of described mobile node, and sets up the domain name of described mobile node and the mapping between described second network protocol address at domain name server;
To sending the first network protocol address of described the first network interface card and the second network protocol address of described the second network interface card for connecting the Interworking gateway of described first network and described second network, at described Interworking gateway, set up the mapping between described first network protocol address and described second network protocol address.
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