CN105897583B - Message forwarding method and device - Google Patents
Message forwarding method and device Download PDFInfo
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- CN105897583B CN105897583B CN201610382573.4A CN201610382573A CN105897583B CN 105897583 B CN105897583 B CN 105897583B CN 201610382573 A CN201610382573 A CN 201610382573A CN 105897583 B CN105897583 B CN 105897583B
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- branch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/668—Internet protocol [IP] address subnets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/72—Routing based on the source address
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
Abstract
The invention discloses message forwarding method and devices, are related to field of communication technology, in order to solve the problems, such as that private net address existing in the prior art is safeguarded more complex and invents.Wherein, this method comprises: the message that the host for receiving the first branch is sent；Message is decapsulated, and adds branch's mark corresponding with the first branch in the message after decapsulation；Message after sending from addition branch mark to central side host generates response message in order to which central side host is identified according to the branch, and branch's mark is carried in response message；The routing iinformation for receiving the response message that central side host is sent and being identified and being pre-stored according to branch, to the host transmitted response message of the first branch.This method is applied under branch hub group-network construction, during message forwards.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of message forwarding methods and device.
Background technique
Network protocol safety (Internet Protocol Security, IPsec) agreement is Internet engineering
The three layer tunnel cryptographic protocol that task groups (The Internet Engineering Task Force, IETF) are formulated, IPsec
The report transmitted between communication party is protected by establishing channel (channel is commonly referred to as the tunnel IPsec) between specific communications side
Text provides the safety assurance of the high quality based on cryptography to interconnect the message of transfers on network, is a kind of realization L 3 virtual
The safe practice of dedicated network (Virtual Private Network, VPN).
When applying IPsec agreement under the network environment of branch hub, the private network planning of branch usually requires that cannot
There is address overlap, which is because, when sending message to branch from center, can lead since address is identical if address overlap
Cause can not choose the correct tunnel IPsec, and then cause message that can not normally receive.Such as: center H and branch B1 establish one
The tunnel IPsec 1 and branch B2 establish the tunnel IPsec 2, and the private network network segment of branch B1 and B2 are
192.168.1.0/24；Then when sending message to private network 192.168.1.0/24 from center, the private network tunnel of selection may be
Tunnel 1 or tunnel 2, possible problem are as follows: tunnel 2 should be passed through instead to the message that branch B1 is sent by tunnel 1
It has been sent to branch B2, has caused B1 that can not normally receive message.In response to this, existing technical solution is to plan in private network
When, avoid the private net address between each branch to be overlapped as far as possible.
But existing this address planning mode, realization is also more complex to the maintenance of private net address, is mainly reflected in: one,
In the case where branch is more, the maintenance cost of private net address is also increased with it.Two, network, can be with when starting to set up
Guarantee that the private net address of each branch does not conflict, but when later maintenance, branch management person may need to private net address
It makes an amendment, it is easy to occur leading to the not available problem of network due to modification private net address.
Summary of the invention
The present invention provides a kind of message forwarding method and device, with solve private net address maintenance existing in the prior art compared with
Complicated problem.
In a first aspect, the present invention provides a kind of message forwarding method, comprising:
Receive the message that the host of the first branch is sent；The message is decapsulated, and is added in the message after decapsulation
Branch corresponding with first branch is added to identify；Sent to central side host the message after adding branch mark in order to
The central side host is identified according to the branch generates response message, and branch's mark is carried in the response message；It connects
It receives the response message that the central side host is sent and is identified according to the branch and pre-stored routing iinformation, Xiang Suoshu the
The host of one branch forwards the response message.
Second aspect, the present invention provide a kind of apparatus for forwarding message, comprising:
Receiving module, the message that the host for receiving the first branch is sent；Processing module, for being unsealed to the message
Dress, and branch's mark corresponding with first branch is added in the message after decapsulation；Sending module is used for central side
The message that host sends after adding branch's mark generates response in order to which the central side host is identified according to the branch
Message carries branch's mark in the response message；The receiving module is also used to receive the central side host and sends
Response message；The sending module is also used to the routing iinformation for identifying and being pre-stored according to the branch, Xiang Suoshu first
The host of branch forwards the response message.
Message forwarding method and device provided by the invention, after the message for receiving the transmission of branch's side host, to the report
Text decapsulation, and branch's mark is added in the message of decapsulation, the message for being added to branch's mark is forwarded to central side master
Machine, central side host equally add branch mark when replying response message；In this way, in transmitted response message, Neng Gougen
It is identified according to the branch, the corresponding gateway address of branch is found, and then forward the response message, with each private network in the prior art
Address cannot exist overlapping compare, application message forwarding method provided by the invention when, for different branches distribution private network
Address can be identical, even if the private net address of different branches is identical, the normal forwarding for realizing message can be also identified according to branch,
Therefore, message forwarding method and device provided by the invention can reduce the complexity of private net address distribution and maintenance.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of network architecture schematic diagram of the network construction form of branch hub provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of message forwarding method provided in an embodiment of the present invention；
Fig. 3 is the flow diagram of another message forwarding method provided in an embodiment of the present invention；
Fig. 4 is the flow diagram of another message forwarding method provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of apparatus for forwarding message provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of network architecture of the network construction form of branch hub, the network architecture
It include: tri- central side, branch A, branch B and branch C branches.Wherein, the private network of central side is Subnet H, and central side includes
Multiple main frames Host H and central side gateway GW H；The corresponding private network of branch A, B and C be respectively Subnet A, Subnet B and
Subnet C, corresponding gateway are respectively GW A, GW B and GW C, and the multiple main frames for including in branch A, B and C are respectively host
Host A, Host B and Host C.
As shown in Fig. 2, the embodiment of the present invention provides a kind of message forwarding method, the network architecture shown in FIG. 1 can be applied to
In, the executing subject of this method is center side gateway, this method comprises:
101: receiving the message that the host of the first branch is sent.
Wherein, described first any branch is branched into, during the specific implementation of this step, the host of the first branch is sent out
The message sent reaches the corresponding gateway of the first branch；The gateway seal up to message according to IPsec agreement to be transmitted to after dress
Heart side gateway.Wherein, the specific implementation process that gateway seals up dress to message can refer to the prior art, and details are not described herein again.
102: the message being decapsulated, and adds branch corresponding with first branch in the message after decapsulation
Mark.
Wherein, branch's mark can number for branch, and different branches correspond to different branch's marks.In the embodiment of the present invention
In, branch's mark is exactly VRF (Virtual Routing Forwarding, virtual routing forwarding) ID, for identifying VRF table
?.
During the specific implementation of this step, central side gateway receives the message of the first branch sealed up after dress, presses
Message is decapsulated according to IPsec agreement, the message after being decapsulated.The source address of message after the decapsulation is first
The address of the host of branch, destination address are center side host.After decapsulation, since the message comes from the first branch, because
This, increases the mark of the first branch in the message after decapsulation.
Wherein, specifically the mark of the first branch of addition when, the can be added in the spare field of the message after decapsulation
The mark of one branch.
Although the spare field of meaning of the embodiment of the present invention is not to be assigned or the field assignment, current value is without any reality
Border meaning, namely the inoperative field in message forwarding.Optionally, which can be multiplexed one in existing message
A little fields, such as the reserved field in TCP header can use the reserved field in GRE if internal layer message is GRE message,
Or directly expand IP agreement, increase an Option Field item for saving branch's mark.
Wherein, central side gateway can refer to the prior art to the specific implementation process that message decapsulates, and details are not described herein again.
103: sent to central side host the message after adding branch mark in order to the central side host according to
Branch's mark generates response message, and branch's mark is carried in the response message.
The message for being added to branch's mark is forwarded to corresponding central side host by central side gateway；The central side host connects
After receiving the message, response message is generated according to branch's mark in message, branch mark is equally carried in the response message, is rung
The specific implementation for adding branch's mark in message is answered to see above described.
104: the road for receiving the response message that the central side host is sent and being identified and being pre-stored according to the branch
By information, the host of the first branch of Xiang Suoshu forwards the response message.
During the specific implementation of the step, due to increasing branch's mark in response message, central side gateway
When receiving response message, it can be identified according to the branch, determine which branch the response message needs to be sent to, therefore, i.e.,
The private net address of different branches is set to there is overlapping, central side gateway also can identify correct transmitted response message according to branch.
Message forwarding method provided in an embodiment of the present invention, after the message for receiving the transmission of branch's side host, to the report
Text decapsulation, and branch's mark is added in the message of decapsulation, the message for being added to branch's mark is forwarded to central side master
Machine, central side host equally add branch mark when replying response message；In this way, in transmitted response message, Neng Gougen
It is identified according to the branch, the corresponding gateway address of branch is found, and then forward the response message, with each private network in the prior art
Address cannot exist overlapping compare, application message forwarding method provided by the invention when, for different branches distribution private network
Address can be identical, even if the private net address of different branches is identical, the normal forwarding for realizing message can be also identified according to branch,
Therefore, message forwarding method provided in an embodiment of the present invention can reduce the complexity of private net address distribution and maintenance.
As shown in figure 3, the embodiment of the present invention also provides a kind of message forwarding method, comprising:
201: being respectively each branch's distribution branch mark.
Wherein, during the specific implementation of the step, the corresponding branch's gateway of each branch respectively with central side gateway
The tunnel IPsec is established, central side gateway is identified to each branch's distribution branch.Since each branch corresponds to a tunnel IPsec,
Therefore, in embodiments of the present invention, branch's mark is exactly VRF (Virtual Routing Forwarding, virtual flow-line forwarding
Table) ID, for identifying VRF table item, i.e. tunnel between the Identification branch, branch and central side.
202: being identified according to the branch, establish and store routing iinformation.
Wherein, the routing iinformation includes the corresponding branch's mark of the corresponding gateway address of each branch and each branch.
Illustratively, routing iinformation includes that the corresponding gateway address of branch A and the corresponding branch of branch A identify, then center
Side gateway is when receiving the response message of central side host transmission, if the branch in the response message including branch A identifies,
Then the response message is transmitted to the gateway of branch A by searching for routing iinformation by gateway.
For each branch's allocation identification and after establishing routing iinformation, message forwarding can be carried out according to the routing iinformation.
203: receiving the message that the host of the first branch is sent.
204: the message being decapsulated, and adds branch corresponding with first branch in the message after decapsulation
Mark.
205: sent to central side host the message after adding branch mark in order to the central side host according to
Branch's mark generates response message, and branch's mark is carried in the response message.
206: the road for receiving the response message that the central side host is sent and being identified and being pre-stored according to the branch
By information, the host of the first branch of Xiang Suoshu forwards the response message.
Wherein, the specific implementation process of step 203 to step 206 can refer to step 101 to step 104, no longer go to live in the household of one's in-laws on getting married herein
It states.
Message forwarding method provided in an embodiment of the present invention is during central side and each branch establish tunnel
Each branch's distribution branch mark, and routing iinformation is established according to branch's mark, then it, can when being E-Packeted according to routing iinformation
Branch's gateway for receiving message is determined according to branch's mark, and then in application message forwarding method provided by the invention,
Even if the private net address of different branches is identical, the normal forwarding for realizing message can be also identified according to branch, therefore, the present invention is real
The message forwarding method for applying example offer can reduce the complexity of private net address distribution and maintenance.
For clearer explanation message forwarding method provided in an embodiment of the present invention, in this way using shown in Fig. 1
The network architecture, and first branches into for branch A and is illustrated.
As shown in figure 4, this method specifically includes the embodiment of the invention also provides a kind of message forwarding method:
Step 1, branch A, B and C gateway initiate to establish the process in tunnel, in this process, center H with center H respectively
Respectively each branch distribution ID simultaneously creates routing iinformation.
Wherein, by taking branch A as an example, the specific implementation process of the step includes:
Step 11: branch A initiates ike negotiation, establishes branch A to the tunnel IPsec at center, is recorded as tunnel A (Tunnel
A), the stream source location of tunnel A protection is Subnet A, and destination address is arbitrary address (Any).
The specific implementation of the step can refer to the prior art, and details are not described herein again.
Step 12: after negotiation, central side is branch A distribution branch mark, identifies branch A, while being also used for identifying
Tunnel A。
Step 13: central side generates a routing, includes the mark and gateway address of branch A in the routing, is used for table
Bright, the message for carrying branch A mark sends the gateway of branch A by tunnel A.
It should be noted that being illustrated only in Fig. 4 as each branch's allocation identification and establishing the data after routing iinformation and turn
Hair process does not show that above-mentioned steps 1,11,12,13.
301: the host Host A in branch A sends message to GW A.
Wherein, the source address of the message is the address of Host A, and destination address is the address of Host H.
302:GW A receives the message that Host A is sent, and carries out adding encapsulation operation to the message.
Wherein, the destination address of the message after sealing up dress is the address of center side gateway GW H, and source address is the net of branch A
Close address GW A.
303:GW A sends the message after sealing up dress to GW H.
304:GW H receives the message after sealing up dress and carries out decapsulation operation, and increases in the message after decapsulation and divide
The branch of branch A identifies.
Wherein, after decapsulation, the source address of message is Host A, and destination address is Host H.
The message that the branch for increasing branch A identifies is forwarded to Host H by 305:GW H.
306:Host H is identified according to the branch of branch A, generates response message.
The source address of the response message is Host H, and destination address is Host A, further includes branch's mark of branch A.
307:Host H sends the response message to GW H.
308:GW H receives the response message, searches pre-stored routing iinformation, determines that the response message should pass through tunnel
Road A is sent to the Host A in branch A, then carries out adding encapsulation operation to the response message.
Wherein, the source address for sealing up the response message after filling is GW H, destination address GWA.
309:GW H sends the message after sealing up dress to GW A.
310:GW A receives the response message and carries out decapsulation operation.
Wherein, the source address of the response message after decapsulation is Host H, destination address HostA.
311:GWA forwards the response message after the decapsulation to Host A.
As shown in figure 5, the embodiment of the present invention also provides a kind of apparatus for forwarding message, comprising:
Receiving module 401, the message that the host for receiving the first branch is sent.
Processing module 402 for decapsulating to the message, and is added and described first point in the message after decapsulation
The corresponding branch's mark of branch.
Sending module 403, for sending the message after adding branch mark to central side host in order in described
Heart side host is identified according to the branch generates response message, and branch's mark is carried in the response message.
The receiving module 401 is also used to receive the response message that the central side host is sent.
The sending module 403 is also used to the routing iinformation for identifying and being pre-stored according to the branch, Xiang Suoshu first
The host of branch forwards the response message.
Further, the processing module 402 is also used to respectively each branch's distribution branch mark；According to described point
Branch mark, establishes and stores the routing iinformation, and the routing iinformation includes the corresponding gateway address of each branch and each point
The corresponding branch's mark of branch.
Further, the sending module 403, is specifically used for: being identified according to the branch and pre-stored routing is believed
Breath, determines the gateway address of corresponding first branch of the response message；The response message is carried out to add encapsulation operation, it is described
The destination address of response message after sealing up dress is the gateway address of first branch；To the corresponding gateway of first branch
The response message is sent, in order to which the gateway of first branch forwards the response report to the host of first branch
Text.
Apparatus for forwarding message provided in an embodiment of the present invention, after the message for receiving the transmission of branch's side host, to the report
Text decapsulation, and branch's mark is added in the message of decapsulation, the message for being added to branch's mark is forwarded to central side master
Machine, central side host equally add branch mark when replying response message；In this way, in transmitted response message, Neng Gougen
It is identified according to the branch, the corresponding gateway address of branch is found, and then forward the response message, with each private network in the prior art
Address cannot exist overlapping compare, application apparatus for forwarding message provided by the invention when, for different branches distribution private network
Address can be identical, even if the private net address of different branches is identical, the normal forwarding for realizing message can be also identified according to branch,
Therefore, apparatus for forwarding message provided in an embodiment of the present invention can reduce the complexity of private net address distribution and maintenance.
It is apparent to those skilled in the art that for convenience and simplicity of description, only with above-mentioned each function
The division progress of module can according to need and for example, in practical application by above-mentioned function distribution by different function moulds
Block is completed, i.e., the internal structure of device is divided into different functional modules, to complete all or part of function described above
Energy.The specific work process of the system, apparatus, and unit of foregoing description, can be with reference to corresponding in preceding method embodiment
Journey, details are not described herein.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. a kind of message forwarding method characterized by comprising
Receive the message that the host of the first branch is sent；
The message is decapsulated, and adds branch's mark corresponding with first branch in the message after decapsulation；
The message after adding branch's mark is sent to central side host in order to which the central side host is according to the branch
Mark generates response message, and branch's mark is carried in the response message；
The routing iinformation for receiving the response message that the central side host is sent and being identified and being pre-stored according to the branch, to
The host of first branch forwards the response message.
2. the method according to claim 1, wherein it is described receive the first branch host send message it
Before, the method also includes:
Respectively each branch's distribution branch mark；
It is identified according to the branch, establishes and store the routing iinformation, the routing iinformation includes the corresponding net of each branch
Close the corresponding branch's mark in address and each branch.
3. according to the method described in claim 2, it is characterized in that, the routing for identifying and being pre-stored according to the branch
The host of information, the first branch of Xiang Suoshu forwards the response message, specifically includes:
The routing iinformation for being identified and being pre-stored according to the branch, determines the gateway of corresponding first branch of the response message
Address；
The response message is carried out plus encapsulation operation, the destination address of the response message after sealing up dress are first branch
Gateway address；
Send the response message to the gateway of first branch, in order to first branch gateway to described first point
The host of branch forwards the response message.
4. the method according to claim 1, wherein addition and described first in the message after decapsulation
The corresponding branch's mark of branch, specifically includes:
The corresponding branch's mark of first branch is set by the value of the spare field in the message of the decapsulation.
5. method according to any one of claims 1 to 4, which is characterized in that the branch is identified as branch's number.
6. a kind of apparatus for forwarding message characterized by comprising
Receiving module, the message that the host for receiving the first branch is sent；
Processing module is added corresponding with first branch for decapsulating to the message, and in the message after decapsulation
Branch mark；
Sending module, for sending the message after adding branch's mark to central side host in order to the central side host
It is identified according to the branch and generates response message, branch's mark is carried in the response message；
The receiving module is also used to receive the response message that the central side host is sent；
The sending module is also used to the routing iinformation for identifying and being pre-stored according to the branch, the first branch of Xiang Suoshu
Host forwards the response message.
7. device according to claim 6, which is characterized in that
The processing module is also used to respectively each branch's distribution branch mark；
It is identified according to the branch, establishes and store the routing iinformation, the routing iinformation includes the corresponding net of each branch
Close the corresponding branch's mark in address and each branch.
8. device according to claim 7, which is characterized in that the sending module is specifically used for being marked according to the branch
The routing iinformation known and be pre-stored, determines the gateway address of corresponding first branch of the response message；
The response message is carried out plus encapsulation operation, the destination address for sealing up the response message after dress are described first point
The gateway address of branch；
Send the response message to the gateway of first branch, in order to first branch gateway to described first point
The host of branch forwards the response message.
9. device according to claim 6, which is characterized in that the processing module, specifically for by the decapsulation
The value of spare field in message is set as the corresponding branch's mark of first branch.
10. according to the described in any item devices of claim 6 to 9, which is characterized in that the branch is identified as branch's number.
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| CN201610382573.4A CN105897583B (en) | 2016-05-31 | 2016-05-31 | Message forwarding method and device |
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| CN109617922B (en) * | 2019-01-24 | 2021-04-27 | 杭州迪普科技股份有限公司 | Processing method and device for VPN protection network segment conflict, and electronic equipment |
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| CN102045249A (en) * | 2009-10-22 | 2011-05-04 | 杭州华三通信技术有限公司 | Method and equipment for forwarding message in network communication |
| CN102244688A (en) * | 2010-05-11 | 2011-11-16 | 华为技术有限公司 | Message forwarding method, apparatus thereof and system threof |
| US8259571B1 (en) * | 2010-03-26 | 2012-09-04 | Zscaler, Inc. | Handling overlapping IP addresses in multi-tenant architecture |
| CN102868586A (en) * | 2012-09-25 | 2013-01-09 | 杭州华三通信技术有限公司 | Method for establishing tunnel forwarding table entries, central node and branch nodes |
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|---|---|---|---|---|
| CN102045249A (en) * | 2009-10-22 | 2011-05-04 | 杭州华三通信技术有限公司 | Method and equipment for forwarding message in network communication |
| US8259571B1 (en) * | 2010-03-26 | 2012-09-04 | Zscaler, Inc. | Handling overlapping IP addresses in multi-tenant architecture |
| CN102244688A (en) * | 2010-05-11 | 2011-11-16 | 华为技术有限公司 | Message forwarding method, apparatus thereof and system threof |
| CN102868586A (en) * | 2012-09-25 | 2013-01-09 | 杭州华三通信技术有限公司 | Method for establishing tunnel forwarding table entries, central node and branch nodes |
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