CN102970386A - Method and device for realizing traverse of IPv6 message to IPv4 network - Google Patents
Method and device for realizing traverse of IPv6 message to IPv4 network Download PDFInfo
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- CN102970386A CN102970386A CN201210461711XA CN201210461711A CN102970386A CN 102970386 A CN102970386 A CN 102970386A CN 201210461711X A CN201210461711X A CN 201210461711XA CN 201210461711 A CN201210461711 A CN 201210461711A CN 102970386 A CN102970386 A CN 102970386A
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Abstract
The invention provides a method and a device for realizing traverse of an IPv6 message to an IPv4 network. The method comprises the following steps: when receiving the IPv6 message sent by a client, judging whether an IPv6 session table has a session table item corresponding to the IPv6 message or not, so as to obtain a first judging result; if the first judging result is yes, increasing an IPv4 masthead to the IPv6 message to obtain an IPv4 message, and sending the IPv4 message to a BR device through an IPv6-in-IPv4 channel in the IPv4 network; and when the first judging result is no, increasing an IPv4 masthead to the IPv6 to obtain the IPv4 message according to the IPv4 addresses of the CE and BR devices, and sending the IPv4 message to the BR device through the IPv6-in-IPv4 channel and adding a session table item corresponding to the IPv6 message in the IPv6 session table as well as adding the session table item corresponding to the IPv4 in the IPv4 session table. According to the invention, the message processing efficiency in 6rd can be improved.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to the method and apparatus that a kind of IPv6 of realization message passes through the IPv4 network.
Background technology
Along with Internet technology develop rapidly in the world, the demand of IP address is become very urgent.Because IPv6 and IPv4 are incompatible, therefore account for leading net environment at IPv4, IPv4 becomes the key of IPv6 success to seamlessly transitting of IPv6.Up-to-date transitional technology has 6rd, DS-lite, A+P, NAT64 and PNAT etc. at present.
6rd(IPv6rapid deployment on IPv4infrastructures, the IPv6 rapid deployment) be a kind of method that the IPv6 business can be provided for the terminal use fast, for introducing the IPv6 service at the IPv6 transition initial stage, operator provides thinking.Fig. 1 is the basic networking schematic diagram of 6rd, with reference to Fig. 1, a complete 6rd territory is by a series of customer edge devices (Customer Edge, CE) and edge router (BorderRouter, BR) form, 6RD CE connects isolated IPv6 site and IPv4 network, and 6RD BR is positioned in the middle of IPv4 network and the IPv6 network, is responsible for relay forwarding message between 6RD territory and other IPv6 territories.Pass through the 6RD tunnel transmission communication information between the CE in the IPv4 network and between CE and the BR, wherein, described 6RD tunnel is the IPv6-in-IPv4 tunnel.
Fig. 2 is the message process chart among the 6rd, as shown in Figure 2, the scheme that realizes at present 6rd mainly adopts tunneling technique to realize, need to create virtual interface at CE equipment and BR equipment, behind the message arrival equipment, need to look into route, be routed to the operation of adding IPV4 header or removing ipv6 header behind the virtual interface, the new message of generation sends after looking into route again.As seen, the 6rd that existing scheme realizes needs to carry out looking into routing operations twice to each message on CE equipment or BR equipment, and the treatment effeciency of message is not high.
Summary of the invention
In view of this, the purpose of this invention is to provide the method and apparatus that a kind of IPv6 of realization message passes through the IPv4 network, can improve the message treatment effeciency among the 6rd.
For achieving the above object, it is as follows to the invention provides technical scheme:
A kind of IPv6 of realization message passes through the method for IPv4 network, is applied on the CE equipment, and described method comprises:
When receiving the IPv6 message of client transmission, judge whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, obtain the first judged result;
When described the first judged result when being, according to described session entry, described IPv6 message is increased IPV4 header obtains the IPv4 message, described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
When described first when the determination result is NO, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message.
A kind of IPv6 of realization message passes through the method for IPv4 network, is applied to comprise on the BR equipment:
When receiving the IPv4 message that CE equipment sends by the IPv6-in-IPv4 tunnel in the IPv4 network, judge whether there be the session entry corresponding with this IPv4 message in the IPv4 conversational list, obtain the second judged result;
When described the second judged result when being, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is gone out;
When described second when the determination result is NO, the IPV4 header of removing described IPv4 message obtains the IPv6 message, described IPv6 message repeating is gone out, and in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message, and, in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message.
A kind of CE equipment comprises:
The first judge module when being used for receiving the IPv6 message of client transmission, judges whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, obtain the first judged result;
The first processing module, be used for when described the first judged result when being, according to described session entry, described IPv6 message increase IPV4 header is obtained the IPv4 message, described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
The second processing module, be used for when described first when the determination result is NO, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, the increase session entry corresponding with described IPv4 message in the IPv4 conversational list.
A kind of BR equipment comprises:
The second judge module when being used for receiving the IPv4 message that the IPv6-in-IPv4 tunnel of CE equipment by the IPv4 network send, judges whether there be the session entry corresponding with this IPv4 message in the IPv4 conversational list, obtain the second judged result;
The manages module everywhere, be used for when described the second judged result when being, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is gone out;
The 5th processing module, be used for when described second when the determination result is NO, the IPV4 header of removing described IPv4 message obtains the IPv6 message, described IPv6 message repeating is gone out, and in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message, and, in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message.
Compared with prior art, the invention provides the scheme that a kind of tactful mode realizes 6rd, message so, has been realized the high efficiency of message is transmitted without virtual interface but be combined with session and fast phase inversion.
Description of drawings
Fig. 1 is the basic networking schematic diagram of 6rd;
Fig. 2 is the message process chart among the 6rd;
Fig. 3 is the method flow diagram that the realization IPv6 message of the embodiment of the invention 1 passes through the IPv4 network;
Fig. 4 is the method flow diagram that the realization IPv6 message of the embodiment of the invention 2 passes through the IPv4 network.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
Need to create virtual interface at CE equipment and BR equipment for what realization 6rd in the prior art existed, and each message needs to carry out looking into routing operations twice on equipment, the problem that the message treatment effeciency is not high, the invention provides the scheme that a kind of tactful mode realizes 6rd, message is without virtual interface but be combined with session and fast phase inversion, so, realized the high efficiency of message is transmitted.
Embodiment 1
Fig. 3 shows the method that a kind of IPv6 of realization message passes through the IPv4 network, and the method is applicable to network environment shown in Figure 1.In this network environment, CE equipment and BR equipment have all been opened the 6rd function, and foundation had 6rd tunnel, i.e. IPv6-in-IPv4 tunnel before CE equipment and BR equipment were two stack equipment CE equipment and BR equipment.Regulation according to 6rd relevant criterion or standard, when opening the 6rd function, network provider (Internet Service Provider, ISP) give IPv4 address and the 6rd parameter of the following parameter of CE devices allocation: CE, wherein, the 6rd parameter comprises: the general prefix length of 6rd territory IPv4,6rd territory IPv4 common suffixes length, 6rd prefix, 6rd prefix length, 6rd BR IPv4 address.Wherein, CE equipment can represent prefix (being embedded with the IPv4 address of CE equipment in this prefix) according to the synthetic 6rd of the IPv4 address computation of 6rd prefix and CE equipment, when being client distributing IP v6 address, uses this 6rd to represent prefix.Configuration to BR equipment specifically sees also 6rd relevant criterion or standard.
Method shown in Figure 3 is applied on the CE equipment, and with reference to Fig. 3, described method can comprise the steps:
Step 301 receives the IPv6 message that client sends;
Step 302 judges whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, if, enter step 304, enter if not step 303;
When receiving the IPv6 message, five-tuple information and IPv6 conversational list according to the IPv6 message mate, the match is successful, then according to the processing policy in the session entry that matches this IPv6 message is processed, it fails to match, after then according to predetermined policy this IPv6 message being processed, in the IPv6 conversational list, increase corresponding list item.
Store IPv4 conversational list and IPv6 conversational list on the CE equipment, described IPv6 conversational list generates according to the IPv6 message, and the content of list item is the five-tuple information of IPv6 message and to the processing policy of IPv6 message; Described IPv4 conversational list generates according to the IPv4 message, and the content of list item is the five-tuple information of IPv4 message and to the processing policy of IPv4 message.Concrete foundation and the update method of IPv4 conversational list and IPv6 conversational list see also subsequent step.
Step 303, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message.
When it fails to match, according to predetermined policy this IPv6 message is processed, this predetermined policy can be, if find to be embedded with the IPv4 address in this IPv6 message, and the IPv4 address that is this CE equipment, this IPv4 address, then determine and need to carry out the IPv4 encapsulation to this IPv6 message, and send by 6rd tunnel (being the IPv6-in-IPv4 tunnel), wherein, the source address of the IPV4 header that described IPv6 message is increased is the IPv4 address of CE equipment, and destination address is the IPv4 address of BR equipment.
Then, need in IPv4 conversational list and IPv6 conversational list, increase session entry.Particularly, for the IPv6 conversational list, increase therein a list item, the content of this list item is the five-tuple information of IPv6 message and to the processing policy of IPv6 message, this processing policy can be, the IPv6 message that receives is carried out IPv4 encapsulation, and the source address of the IPV4 header that described IPv6 message is increased is the IPv4 address of CE equipment, destination address is the IPv4 address of BR equipment.For the IPv4 conversational list, increase therein a list item, the content of this list item is the five-tuple information of IPv4 message and to the processing policy of IPv4 message, this processing policy can be to remove the IPV4 header of the IPv4 message that receives.
Step 304 according to described session entry, increases IPV4 header to described IPv6 message and obtains the IPv4 message, and described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
When the match is successful, according to the session entry that matches, obtain the processing policy to the IPv6 message, be specially: the IPv6 message that receives is carried out the IPv4 encapsulation, and the source address of the IPV4 header that described IPv6 message is increased is the IPv4 address of CE equipment, and destination address is the IPv4 address of BR equipment.
It more than is the handling process that CE equipment receives the IPv6 message of client transmission.Handling process when below introducing CE equipment and receiving the IPv4 message that BR equipment sends by the IPv6-in-IPv4 tunnel is specifically as follows:
When receiving the IPv4 message that BR equipment sends by the IPv6-in-IPv4 tunnel, from described IPv4 conversational list, obtain the session entry corresponding with described IPv4 message, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is arrived client.
In fact, the IPv4 message that CE equipment receives from the IPv6-in-IPv4 tunnel is the response message of certain IPv4 message of its transmission, the two belongs to same session, in the IPv4 conversational list, can match corresponding session entry, therefore, can directly process according to the processing policy of this session entry record, as previously mentioned, this processing policy is that the IPV4 header of removing the IPv4 message that receives obtains the IPv6 message.
Corresponding with said method, the embodiment of the invention also provides a kind of CE equipment, and described CE equipment can comprise:
The first judge module when being used for receiving the IPv6 message of client transmission, judges whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, obtain the first judged result;
The first processing module, be used for when described the first judged result when being, according to described session entry, described IPv6 message increase IPV4 header is obtained the IPv4 message, described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
The second processing module, be used for when described first when the determination result is NO, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, the increase session entry corresponding with described IPv4 message in the IPv4 conversational list.
Further, described CE equipment can also comprise:
The 3rd processing module, when being used for receiving the IPv4 message that BR equipment sends by the IPv6-in-IPv4 tunnel, from described IPv4 conversational list, obtain the session entry corresponding with described IPv4 message, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is arrived client.
Embodiment 2
Fig. 4 shows the method that a kind of IPv6 of realization message passes through the IPv4 network, and the method is applicable to network environment shown in Figure 1.In this network environment, CE equipment and BR equipment have all been opened the 6rd function, and CE equipment and BR equipment are two stack equipment, and setting up before CE equipment and the BR equipment has 6rd tunnel, i.e. IPv6-in-IPv4 tunnel.Configuration to BR equipment specifically sees also 6rd relevant criterion or standard.
Method shown in Figure 4 is applied on the BR equipment, and with reference to Fig. 4, described method can comprise the steps:
(IPv6-in-IPv4 tunnel) is when receiving the IPv4 message from the 6rd tunnel, five-tuple information and IPv4 conversational list according to the IPv4 message mate, the match is successful, then according to the processing policy in the session entry that matches this IPv4 message is processed, it fails to match, after then according to predetermined policy this IPv4 message being processed, in the IPv4 conversational list, increase corresponding list item.
Store IPv4 conversational list and IPv6 conversational list on the BR equipment, described IPv4 conversational list generates according to the IPv4 message, and the content of list item is the five-tuple information of IPv4 message and to the processing policy of IPv4 message; Described IPv6 conversational list generates according to the IPv6 message, and the content of list item is the five-tuple information of IPv6 message and to the processing policy of IPv6 message.Concrete foundation and the update method of IPv4 conversational list and IPv6 conversational list see also subsequent step.
When it fails to match, according to predetermined policy this IPv4 message is processed, this predetermined policy can be, be the IPv4 address of this BR equipment if find the destination address of this IPv4 message, and this IPv4 message is the IPv6-in-IPv4 message, determine that then need to carry out decapsulation to this IPv4 message obtains the IPv6 message,, needs to remove the IPV4 header of the IPv4 message that receives that is.
Then, need in IPv4 conversational list and IPv6 conversational list, increase session entry.Particularly, for the IPv4 conversational list, increase therein a list item, the content of this list item is the five-tuple information of IPv4 message and to the processing policy of IPv4 message, and this processing policy can be to remove the IPV4 header of the IPv4 message that receives.For the IPv6 conversational list, increase therein a list item, the content of this list item is the five-tuple information of IPv6 message and to the processing policy of IPv6 message, this processing policy can be, the IPv6 message that receives is carried out the IPv4 encapsulation, and the source address of the IPV4 header that described IPv6 message is increased is the IPv4 address of BR equipment, and destination address is the IPv4 address of CE equipment.
When the match is successful, according to the session entry that matches, obtain the processing policy to the IPv4 message, be specially: the IPv4 message that receives is carried out decapsulation, namely remove the IPV4 header of described IPv4 message, obtain the IPv6 message.
More than be the handling process of BR equipment when receiving the IPv4 message that CE equipment sends by the IPv6-in-IPv4 tunnel.Handling process when below introducing BR equipment and receiving the IPv6 message from the IPv6 network is specifically as follows:
When receiving the IPv6 message, from described IPv6 conversational list, obtain the session entry corresponding with described IPv6 message, according to described session entry, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to CE equipment by the IPv6-in-IPv4 tunnel.
In fact, the IPv6 message that BR equipment receives from the IPv6 network is the response message of certain IPv6 message of its transmission, the two belongs to same session, in the IPv6 conversational list, can match corresponding session entry, therefore, can directly process according to the processing policy of this session entry record, as previously mentioned, this processing policy is, the IPv6 message that receives is carried out the IPv4 encapsulation, and the source address of the IPV4 header that described IPv6 message is increased is the IPv4 address of BR equipment, and destination address is the IPv4 address of CE equipment.
Corresponding with said method, the embodiment of the invention also provides a kind of BR equipment, and described BR equipment can comprise:
The second judge module when being used for receiving the IPv4 message that the IPv6-in-IPv4 tunnel of CE equipment by the IPv4 network send, judges whether there be the session entry corresponding with this IPv4 message in the IPv4 conversational list, obtain the second judged result;
The manages module everywhere, be used for when described the second judged result when being, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is gone out;
The 5th processing module, be used for when described second when the determination result is NO, the IPV4 header of removing described IPv4 message obtains the IPv6 message, described IPv6 message repeating is gone out, and in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message, and, in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message.
Further, described BR equipment can also comprise:
The 6th processing module, when being used for receiving the IPv6 message, from described IPv6 conversational list, obtain the session entry corresponding with described IPv6 message, according to described session entry, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to CE equipment by the IPv6-in-IPv4 tunnel.
In sum, the present invention depends on session and comes matching strategy, provides list item for turning soon simultaneously.After the success of message matching strategy, message afterwards will be walked soon to turn according to session entry, and performance is higher, and speed is faster.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. realize that the IPv6 message passes through the method for IPv4 network for one kind, be applied to it is characterized in that on the CE equipment that described method comprises:
When receiving the IPv6 message of client transmission, judge whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, obtain the first judged result;
When described the first judged result when being, according to described session entry, described IPv6 message is increased IPV4 header obtains the IPv4 message, described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
When described first when the determination result is NO, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message.
2. the method for claim 1 is characterized in that, also comprises:
When receiving the IPv4 message that BR equipment sends by the IPv6-in-IPv4 tunnel, from described IPv4 conversational list, obtain the session entry corresponding with described IPv4 message, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is arrived client.
3. realize that the IPv6 message passes through the method for IPv4 network for one kind, be applied to it is characterized in that on the BR equipment, comprising:
When receiving the IPv4 message that CE equipment sends by the IPv6-in-IPv4 tunnel in the IPv4 network, judge whether there be the session entry corresponding with this IPv4 message in the IPv4 conversational list, obtain the second judged result;
When described the second judged result when being, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is gone out;
When described second when the determination result is NO, the IPV4 header of removing described IPv4 message obtains the IPv6 message, described IPv6 message repeating is gone out, and in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message, and, in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message.
4. method as claimed in claim 3 is characterized in that, also comprises:
When receiving the IPv6 message, from described IPv6 conversational list, obtain the session entry corresponding with described IPv6 message, according to described session entry, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to CE equipment by the IPv6-in-IPv4 tunnel.
5. a CE equipment is characterized in that, comprising:
The first judge module when being used for receiving the IPv6 message of client transmission, judges whether there be the session entry corresponding with this IPv6 message in the IPv6 conversational list, obtain the first judged result;
The first processing module, be used for when described the first judged result when being, according to described session entry, described IPv6 message increase IPV4 header is obtained the IPv4 message, described IPv4 message is sent to BR equipment by the IPv6-in-IPv4 tunnel in the IPv4 network;
The second processing module, be used for when described first when the determination result is NO, IPv4 address according to CE equipment and BR equipment, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to BR equipment by described IPv6-in-IPv4 tunnel, and in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message, and, the increase session entry corresponding with described IPv4 message in the IPv4 conversational list.
6. CE equipment as claimed in claim 5 is characterized in that, also comprises:
The 3rd processing module, when being used for receiving the IPv4 message that BR equipment sends by the IPv6-in-IPv4 tunnel, from described IPv4 conversational list, obtain the session entry corresponding with described IPv4 message, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is arrived client.
7. a BR equipment is characterized in that, comprising:
The second judge module when being used for receiving the IPv4 message that the IPv6-in-IPv4 tunnel of CE equipment by the IPv4 network send, judges whether there be the session entry corresponding with this IPv4 message in the IPv4 conversational list, obtain the second judged result;
The manages module everywhere, be used for when described the second judged result when being, according to described session entry, the IPV4 header of removing described IPv4 message obtains the IPv6 message, and described IPv6 message repeating is gone out;
The 5th processing module, be used for when described second when the determination result is NO, the IPV4 header of removing described IPv4 message obtains the IPv6 message, described IPv6 message repeating is gone out, and in the IPv4 conversational list, increase the session entry corresponding with described IPv4 message, and, in the IPv6 conversational list, increase the session entry corresponding with described IPv6 message.
8. BR equipment as claimed in claim 7 is characterized in that, also comprises:
The 6th processing module, when being used for receiving the IPv6 message, from described IPv6 conversational list, obtain the session entry corresponding with described IPv6 message, according to described session entry, described IPv6 message is increased IPV4 header obtain the IPv4 message, described IPv4 message is sent to CE equipment by the IPv6-in-IPv4 tunnel.
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