CN109819067A - The method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators - Google Patents
The method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators Download PDFInfo
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Abstract
The present invention relates to a kind of methods for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, comprising the following steps: (1) private network device regularly sends the STUN message being encapsulated in VXLAN message；(2) id information in message matches tunnel to public network equipment based on the received, obtains corresponding private network IP and port information, and corresponding with current public network IP and port information, and to private network device reply STUN message.Using the method for the invention for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, mechanism is passed through by using the NAT based on VXLAN and STUN, it can solve in big two layers of SD-WAN of intercommunication scene, the problem of there are NAT device for centre, can not be connected by the tunnel VXLAN between private network cpe device and public network POP equipment.
Description
Technical field
The present invention relates to field of network interconnection technology more particularly to private network devices and public network equipment connection area, in particular to one
The method that kind realizes the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators.
Background technique
Generally by Internet or the special line interconnection for renting ISP between the branch and general headquarters of enterprise, to provide data
The service such as shared, E-MAIL, Web application and video conference.In the selection of ISP link, Internet link bandwidth is at low cost,
But quality is difficult to meet the QOS responsive type service such as HD video meeting；Special line bandwidth is at high cost, then for bandwidth intensive business
Unnecessary erection cost can be brought to enterprise.The characteristics of both comprehensive, and consider the risk of network disaster tolerance, using ISP
Multiple exit+special line services the mode of on-demand real-time selection, and balance can be reached more preferably between service quality and network cost, real
The key benefits of existing client.
Existing general headquarters, the branch interconnection scheme of industry, POP point generally use the embedded type C PE equipment of enclosed operation system,
Basic network connection and encryption and decryption functions comparative maturity.But business routing common static configuration mode, it is real-time in network quality
When variation, it is then unable to do what one wishes to adjust routing on demand to business, and administrator is more needed to carry out subsequent manual intervention.Sum up its reason
Have several following.
1, the business identification of tradition CPE and network monitoring capability are weak, it is difficult to be supported to routing decision.
2, tradition CPE static configuration, from main logic, lack with arranging system collaboration capabilities, be difficult to do and of overall importance effectively sentence
It is disconnected.
3, tradition CPE model is numerous, and order and function support situation different, lacks the basis that Unified Policy issues.
Other than the short slab of the key functions such as multiple exit, traditional CPE there is also open excessive cycle (3 months), new industry
It is engaged in online slow (it is long that software and hardware couples the development cycle), the problems such as configuration complicated (closing, privately owned).User cannot be according to itself
Business, network is flexibly customized.The service deployment demand of government and enterprises user obviously is constrained, increases O&M cost.
In this context, SD-WAN comes into being.
SD-WAN (Software-defined WAN), by utilizing virtualization technology, the strategy and overlay of application layer
Network may can be realized following two purpose there are also the cpe device of on-site:
1, a plurality of shared or privately owned link is comprehensively utilized, allows generic link that can reach the network quality of special line, reduces
Flow cost improves bandwidth.
2, according to state of the current network and the strategy of configuration, optimal path is automatically selected, load balancing is realized, ensure that network matter
Amount.
Meanwhile the development of technology allows and opens new branch also very simply, usually only needs to plug cable, using just
Can automatic " phone home " obtain initial configuration, complete application and update, system initialization is simultaneously established and enterprise headquarters
Link.
In SD-WAN, the connection of branch and general headquarters is realized by Internet, is usually carried out by the tunnel of Overlay
Connection.This is divided into two kinds of application scenarios again:
1, the connection of three layers of Overlay is done using tunnel.Traditional technical solution is using the tunnel IPsec.
2, the connection of two layers of Overlay is done using tunnel.For certain business, big two layers of intercommunication is needed, is at this moment led to
The tunnel VXLAN is often used to be interconnected.
In second of scene, between branch and general headquarters (or POP), it will usually which the IP there are NAT device, i.e. branch equipment is
Private network IP, and the IP of general headquarters (or POP) is public network IP, the intermediate conversion that IP is carried out by NAT device.Due to the tunnel VXLAN skill
Art does not support NAT to pass through, and public network equipment can not learn public network IP and PORT of the private network device after NAT is passed through, in this feelings
Under condition, public network equipment can not encapsulate the VXLAN heading for issuing private network device.
STUN (the UDP simple traversal of Simple Traversal of UDP over NATs, NAT) agreement is RFC
A kind of network protocol proposed in 5389, it allows to be located at the public network that the client after NAT (or multiple NAT) finds out oneself
Location is found and oneself is located at after which type of NAT and NAT is internet side end bound in some local port
Mouthful.These information are used to establish UDP communication at two while between the host after NAT router.
Summary of the invention
The purpose of the present invention is overcoming the above-mentioned prior art, provide a kind of high-efficient, easy to operate, applicable
The method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators in extensive range.
To achieve the goals above, of the invention to realize that the NAT based on VXLAN tunneling technique passes through place using Simple Traversal of UDP Through Network Address Translators
The method of reason is as follows:
The method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, is mainly characterized by,
The method the following steps are included:
(1) private network device regularly sends the STUN message being encapsulated in VXLAN message；
(2) id information in message matches tunnel to public network equipment based on the received, obtains corresponding private network IP and port letter
Breath, and it is corresponding with current public network IP and port information, and STUN message is replied to private network device.
Preferably, the step (2) specifically includes the following steps:
(2.1) public network equipment judges whether to receive STUN message within a preset time, if so, continuing step (2.2)；
Otherwise, aging packaging information；
(2.2) packaging information of public network equipment parsing ID and matching local terminal VXLAN, and obtained from the STUN message
Public network IP and port；
(2.3) public network equipment replys the message comprising newly-generated packaging information to private network device, and records private network IP
And port information.
Preferably, the STUN message that the private network device is sent includes the tunnel VXLAN of private network device and public network equipment
Id information, original private network IP and port information.
Preferably, the private network device encapsulates STUN message by extension Simple Traversal of UDP Through Network Address Translators.
Preferably, the VXLAN encapsulation header information of the STUN message and the VXLAN encapsulation header information one of data message
It causes.
Preferably, the source port for the VXLAN message that the private network device is sent is 4789.
Preferably, same of the id information of the privately owned attribute for the STUN message that the private network device issues and public network equipment
The id information in the tunnel VXLAN is consistent.
Using the method for the invention for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, lead to
It crosses and mechanism is passed through using the NAT based on VXLAN and STUN, can solve in big two layers of SD-WAN of intercommunication scene, centre exists
NAT device, the problem of can not being connected by the tunnel VXLAN between private network cpe device and public network POP equipment.
Detailed description of the invention
Fig. 1 is network topology schematic diagram in the prior art.
Fig. 2 is the group of the method for the invention that the NAT penetration management based on VXLAN tunneling technique is realized using Simple Traversal of UDP Through Network Address Translators
Net schematic diagram.
Fig. 3 is the method for the invention that the NAT penetration management based on VXLAN tunneling technique is realized using Simple Traversal of UDP Through Network Address Translators
STUN heading form schematic diagram.
Fig. 4 is the method for the invention that the NAT penetration management based on VXLAN tunneling technique is realized using Simple Traversal of UDP Through Network Address Translators
STUN message type field schematic diagram.
Fig. 5 is the method for the invention that the NAT penetration management based on VXLAN tunneling technique is realized using Simple Traversal of UDP Through Network Address Translators
STUN attribute field schematic diagram.
Fig. 6 is oneself of the method for the invention that the NAT penetration management based on VXLAN tunneling technique is realized using Simple Traversal of UDP Through Network Address Translators
Define privately owned attribute field schematic diagram.
Specific embodiment
It is further to carry out combined with specific embodiments below in order to more clearly describe technology contents of the invention
Description.
The method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators of the invention, including
Following steps:
(1) private network device regularly sends the STUN message being encapsulated in VXLAN message；
(2) id information in message matches tunnel to public network equipment based on the received, obtains corresponding private network IP and port letter
Breath, and it is corresponding with current public network IP and port information, and STUN message is replied to private network device；
(2.1) public network equipment judges whether to receive STUN message within a preset time, if so, continuing step (2.2)；
Otherwise, aging packaging information；
(2.2) packaging information of public network equipment parsing ID and matching local terminal VXLAN, and obtained from the STUN message
Public network IP and port；
(2.3) public network equipment replys the message comprising newly-generated packaging information to private network device, and records private network IP
And port information.
As the preferred embodiment of the present invention, the STUN message that the private network device is sent includes private network device and public affairs
The id information in the tunnel VXLAN of net equipment, original private network IP and port information.
As the preferred embodiment of the present invention, the private network device is encapsulated STUN by extension Simple Traversal of UDP Through Network Address Translators and reported
Text.
As the preferred embodiment of the present invention, the VXLAN encapsulation header information of the STUN message and data message
VXLAN encapsulation header information is consistent.
As the preferred embodiment of the present invention, the source port for the VXLAN message that the private network device is sent is 4789.
As the preferred embodiment of the present invention, the ID letter of the privately owned attribute for the STUN message that the private network device issues
It ceases consistent with the id information in same a tunnel VXLAN of public network equipment.
In a specific embodiment of the invention, according to extension Simple Traversal of UDP Through Network Address Translators, the VXLAN of private network device and public network equipment is realized
Interconnection.
By extension Simple Traversal of UDP Through Network Address Translators, private network device sends by using privately owned attribute and carries mark both sides VXLAN the present invention
The STUN message of the id information in tunnel and original private network IP and PORT information.
Public network equipment after receiving STUN message, according to id information match tunnel, get corresponding private network IP with
PORT information, and do with PORT information with current public network IP corresponding, instruct forwarding plane packaging V XLAN message.
Meanwhile a kind of keep alive Packet of the STUN message as NAT device, allow intermediate NAT device to create and remain corresponding
NAT conversational list, guarantee the tunnel VXLAN connection.
STUN(Simple Traversal of User Datagram Protocol through Network
Address Translators) it is referred to as NATs, Chinese meaning is the UDP simple traversal of NAT, also is understood as NAT session and wears
More application program.Big variant between the usage of script and demand proposed in this paper, script passes through request and two kinds of response reports
Text obtains the public network information of private network device, but in above-mentioned demand, it is only necessary to which public network equipment gets the public network of private network device
IP and PORT can meet demand.
Message is indicated by allowing private network device to send the STUN with privately owned extension information, and public network equipment can be obtained private network
The public network IP and PORT of equipment, while by periodically sending STUN message, the connection of NAT session is maintained, guarantees the tunnel VXLAN
Connection.
Technical solution provided by the invention is further described below based on core of the invention thought.
Networking schematic diagram allows public affairs as shown in Fig. 2, private network CPE is encapsulated in STUN message in VXLAN message by periodically sending
Net learning equipment to private network CPE public network IP and PORT, for encapsulating the VXLAN heading for the message for issuing private network CPE.
It is as shown in Figure 3 that STUN controls message format.Private network CPE encapsulates STUN message by extension Simple Traversal of UDP Through Network Address Translators.
According to Simple Traversal of UDP Through Network Address Translators, in heading, front two is fixed as 0.
STUN type of message is set as Indication, is worth for 0x01.
Magic Cookie is 0x2112A442 as defined in agreement.
Transaction ID is self-defining value.
In order to support NAT to pass through, the customized attribute of STUN.Customization type is a value not as defined in IANA.
The field of Value is customized as follows, and referred to as privately owned VXLAN load is as shown in Figure 6.
Private is the IP address of private network CPE.
Port is the port address of private network CPE.
Id is the identity information in one tunnel VXLAN of unique identification.
The step of VXLAN message encapsulation of private network CPE, is as follows:
In passing through NAT, usual NAT device can generate conversational list for message five-tuple information, and done and pacified according to conversational list
Full filtering.Therefore, in order to guarantee VXLAN data message can normal passing through NAT, STUN must be encapsulated in VXLAN message, and
And the VXLAN encapsulation header of STUN message will be consistent with the VXLAN encapsulation header information of data message.
In order to which private network cpe device can be identified, the message of backhaul is VXLAN message, the VXLAN report issued from private network device
Literary source port must be 4789 (guarantee the destination port of the return packet after NAT is converted into 4789).
In order to guarantee the not aging of NAT session, private network device needs to regularly send STUN message.
In the STUN message of transmission, the ID of privately owned attribute is had to fill out, and with the same tunnel VXLAN of public network equipment
ID is consistent.
The step of processing of public network equipment, is as follows:
In public network equipment, VXLAN packaging information is configured.Source IP address can only be configured at this time, can not match purpose IP address.It needs
Above-mentioned ID is configured, is kept consistent with private network device.
VXLAN message is received, and after analyzing and being STUN message, parses ID, matches local terminal VXLAN packaging information, and
Public network IP and port are obtained from message, are responded when returning text using newly-generated packaging information.It can recorde private network simultaneously
IP and PORT information is analyzed as data and is used.
When can not receive STUN message for a long time, aging packaging information is needed.
Using the method for the invention for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, lead to
It crosses and mechanism is passed through using the NAT based on VXLAN and STUN, can solve in big two layers of SD-WAN of intercommunication scene, centre exists
NAT device, the problem of can not being connected by the tunnel VXLAN between private network cpe device and public network POP equipment.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that can still make
Various modifications and alterations are without departing from the spirit and scope of the invention.Therefore, the description and the appended drawings should be considered as illustrative
And not restrictive.
Claims (7)
1. a kind of method for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators, which is characterized in that institute
The method stated the following steps are included:
(1) private network device regularly sends the STUN message being encapsulated in VXLAN message；
(2) id information in message matches tunnel to public network equipment based on the received, obtains corresponding private network IP and port information, and
It is corresponding with current public network IP and port information, and STUN message is replied to private network device.
2. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the step (2) specifically includes the following steps:
(2.1) public network equipment judges whether to receive STUN message within a preset time, if so, continuing step (2.2)；It is no
Then, aging packaging information；
(2.2) packaging information of public network equipment parsing ID and matching local terminal VXLAN, and public network is obtained from the STUN message
IP and port；
(2.3) public network equipment replys the message comprising newly-generated packaging information to private network device, and records private network IP and end
Message breath.
3. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the STUN message that the private network device is sent includes the tunnel VXLAN of private network device and public network equipment
Id information, original private network IP and port information.
4. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the private network device encapsulates STUN message by extension Simple Traversal of UDP Through Network Address Translators.
5. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the VXLAN encapsulation header information of the STUN message and the VXLAN encapsulation header information of data message are consistent.
6. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the source port for the VXLAN message that the private network device is sent is 4789.
7. the side according to claim 1 for realizing the NAT penetration management based on VXLAN tunneling technique using Simple Traversal of UDP Through Network Address Translators
Method, which is characterized in that the id information of the privately owned attribute for the STUN message that the private network device issues is same a with public network equipment
The id information in the tunnel VXLAN is consistent.
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| CN114584528A (en) * | 2020-11-17 | 2022-06-03 | ***通信有限公司研究院 | Tunnel establishment method, device and equipment |
| CN114500166A (en) * | 2021-12-24 | 2022-05-13 | 广州爱浦路网络技术有限公司 | IMS communication method based on public network and private network superposition |
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Application publication date: 20190528 |