CN108011986A - A kind of guiding, the method for forwarding data packets and access point apparatus, the network equipment - Google Patents
A kind of guiding, the method for forwarding data packets and access point apparatus, the network equipment Download PDFInfo
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- CN108011986A CN108011986A CN201610931373.XA CN201610931373A CN108011986A CN 108011986 A CN108011986 A CN 108011986A CN 201610931373 A CN201610931373 A CN 201610931373A CN 108011986 A CN108011986 A CN 108011986A
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- message
- terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/2557—Translation policies or rules
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/255—Maintenance or indexing of mapping tables
Abstract
Disclose a kind of guiding, the method for forwarding data packets and access point apparatus, the network equipment.The guiding data message method includes the NAT session entries that access point apparatus determines terminal, the rear to network equipment transmission NAT session announcement messages of the NAT session entries of terminal is being determined, so that the network equipment receive the NAT session announcement messages physical port be sent in destination slogan for the transport layer port number after the NAT in the NAT session entries data message, so that the data message for being sent to terminal is transmitted directly to the access point apparatus of terminal access by the network equipment, the access point apparatus that the terminal accesses is forwarded to by the access point apparatus of the terminal attaching without this is sent to the data message of terminal again, the problem of avoiding the occurrence of flow detour, reduce the traffic overhead of the access point apparatus of the terminal attaching.
Description
Technical field
This application involves wireless communication technology field, more particularly to a kind of guiding, the method for forwarding data packets and access
Point device, the network equipment.
Background technology
WLAN (English：Wireless local area networks, WLAN) multiple access points can be included
(English：Access point, AP).These AP can use identical service set (English：service set
Identifier, SSID) it is (English to provide extended service set：Extended service set, ESS) network.When website (English
Text：Station, STA) it is mobile when, STA switches between AP.After switching, STA associates new AP, to be received and sent out by new AP
Send data.
As shown in Figure 1, establish tunnel between AP1 and AP2, STA by AP1 is switched to AP2, and (alternatively STA is roamed by AP1
To AP2) when, AP2 receives the message that STA accesses internet.If AP2 has found that the STA is from the STA of AP1 roamings, by the STA
The message of access internet be sent to AP1.The message of the access internet of the STA is sent to the network equipment by AP1.Network is set
It is standby to forward the amended message.
When there is the message from internet to need to be forwarded to STA, the network equipment send the message from internet
To AP1.Message from internet is sent to AP2 by AP1.The message from internet is sent to STA by AP2 again, so that
Realize the forwarding of the message from internet.
The message of the access internet of STA and the message of STA is sent to from internet it is required for travelling back across AP1 in such scheme
It is forwarded to, that is, travels back across the ownership AP of the STA and be forwarded to, add AP1 burdens, also increase AP1 congestions can
Can property.
The content of the invention
The application provides a kind of guiding, the method for forwarding data packets and access point apparatus, the network equipment, to solve to overflow
The problem of swimming flow detour in scene.
First aspect, there is provided a kind of method for guiding data message, including：
Access point apparatus determines the network address translation (English of terminal：Network address translation,
NAT) session entry, the NAT session entries of the terminal include the transport layer port number after NAT.Afterwards the access point apparatus to
The network equipment sends NAT session announcement messages, and the NAT session announcements message includes the transport layer port number after the NAT, institute
State NAT session announcements message and indicate that the physical port of the network equipment reception NAT session announcements message is sent to
The destination slogan of the terminal be the NAT after transport layer port number data message.
The physical port that the network equipment receives NAT session announcement messages is connected with access point apparatus.Therefore the network equipment is used
The data message of physical port forwarding can be sent to the access point apparatus for sending NAT session announcement messages, avoid flow
The problem of detour.Access point apparatus by the data message for being sent to terminal be directed to the network equipment when have determined the terminal
NAT session entries, can will be sent to purpose IP address field in the data message of terminal according to the NAT session entries of the terminal
IP address after NAT and the transport layer port number after the NAT of destination slogan field are converted to the address and port before NAT conversions
Number.Therefore, enter point device by the data message for being sent to terminal be directed to the network equipment when can correctly perform NAT.In addition,
The data message for being sent to terminal is distinguished as granularity using the destination slogan of data message, different terminals can be allowed to share identical
IP address after NAT, improves the flexibility of roaming.
With reference to first aspect, in the first possible implementation of first aspect, described access point equipment is described
Terminal connects described access point equipment, and leads to the network equipment transmission NAT sessions when terminal be roaming terminal
Accuse message.
The NAT session announcement messages of the roaming terminal are just sent to network by access point apparatus in access roaming terminal
Equipment, so that the network equipment is when to the roaming terminal forwarding data packets, after the NAT that the roaming terminal can be perceived in time
Transport layer port number, using the physical port forwarding data packets for the NAT session announcement messages for receiving the roaming terminal, is improved
The efficiency of the forwarding data packets of gateway device.
With reference to first aspect or first aspect the first possible implementation, second in first aspect be possible
In implementation, described access point equipment is any appliance in NAT virtual unit groups, described access point equipment and the NAT
Equipment in virtual unit group in addition to described access point equipment includes institute using synchronous NAT conversational lists, the NAT conversational lists
State the NAT session entries of terminal.
With reference to first aspect and first aspect second of possible implementation, first aspect the third may
Implementation in, the NAT virtual units group includes main equipment and slave device, the NAT conversational lists of the NAT virtual units group
In each NAT session entries NAT after transport layer port number distributed by the main equipment.Wherein, access point apparatus determines end
The NAT session entries at end, including：
When described access point equipment is the main equipment in the NAT virtual units group, described access point equipment determines described
The NAT session entries of terminal in the NAT conversational lists of access point apparatus.Described access point equipment be NAT virtual unit groups in from
During equipment, main equipment of the described access point equipment into the NAT virtual units group sends NAT session entry request messages, and
The NAT session entry response messages that the main equipment is sent are received, according to the transport layer in the NAT session entries response message
Port numbers generate the NAT session entries of the terminal.
Access point apparatus can directly be inquired from the NAT conversational lists of oneself the NAT session entries of terminal or
The NAT session entries of the terminal stored on the master to master devices request, can be quickly by the NAT session entries of the terminal
In NAT after transport layer port number be sent to the network equipment so that the network equipment with receive the terminal NAT after transport layer
The data message of the physical port forwarding of port numbers can be sent to the access point apparatus for sending NAT session announcement messages, keep away
The problem of exempting from flow detour.
With reference to first aspect, in the 4th kind of possible implementation of first aspect, described access point equipment is receiving
Lack the message to be forwarded to the message to be forwarded from the terminal, and in the NAT conversational lists of described access point equipment
During NAT session entries, the NAT session entries of the message to be forwarded are generated for the message to be forwarded, and set to the network
Preparation send the NAT session announcements message, wherein the transport layer port number after the NAT is the NAT meetings of the message to be forwarded
Talk about the transport layer port number after the NAT in list item.
Access point apparatus does not inquire the NAT on the message to be forwarded when receiving the message to be forwarded for carrying out self terminal
Session entry is, it is necessary to the NAT session entries of the newly-generated message to be forwarded, so that access point apparatus timely treats the terminal
E-Packet the problem of being forwarded to the network equipment according to the NAT session entries of the message to be forwarded, avoid the occurrence of flow detour.
With reference to first aspect or first aspect the 4th kind of possible implementation, the 5th kind in first aspect be possible
In implementation, described access point equipment is any appliance in NAT virtual unit groups, described access point equipment and the NAT
Equipment in virtual unit group in addition to described access point equipment includes institute using synchronous NAT conversational lists, the NAT conversational lists
State the NAT session entries of terminal.
With reference to first aspect and first aspect the 5th kind of possible implementation, in the 6th kind of possibility of first aspect
Implementation in, the NAT virtual units group includes main equipment and slave device, the NAT conversational lists of the NAT virtual units group
In each NAT session entries NAT after transport layer port number distributed by the main equipment.Wherein, it is the message to be forwarded
The NAT session entries of the message to be forwarded are generated, including：
When described access point equipment is the main equipment in the NAT virtual units group, described access point equipment is generated and deposited
Store up the NAT session entries of the data to be forwarded message.When described access point equipment is the slave device in NAT virtual unit groups,
Main equipment of the described access point equipment into the NAT virtual units group sends NAT session entry request messages, and described in reception
The NAT session entry response messages that main equipment is sent, the transport layer port number life in the NAT session entries response message
Into the NAT session entries of the data to be forwarded message.
With reference to first aspect and first aspect the first possible implementation to the 6th kind of possible implementation
In any implementation, in the 7th kind of possible implementation of first aspect, any two in the NAT virtual units group
Wireless access point control and configuration protocol (English are established between equipment：Control and Provisioning of
Wireless Access Points, CAPWAP) tunnel.
Second aspect, there is provided a kind of method of forwarding data packets, including：
The network equipment obtains the NAT session announcement messages that access point apparatus is sent, and the NAT session announcements message includes
Transport layer port number after NAT.Transport layer port number after the network equipment generation NAT is with receiving the NAT sessions
The correspondence of the physical port of notification packet.The network equipment receives data message, the destination interface of the data message
Number be the NAT after transport layer port number.The network equipment forwards institute according to the correspondence physical port
State data message.
Transport layer port number of the network equipment in the NAT session announcement messages for receiving access point apparatus transmission after NAT
Afterwards, the corresponding pass of physical port of the transport layer port number after the NAT with receiving the NAT session announcements message is generated
System, after being then NAT with the physical port forwarding destination slogan for receiving NAT session announcement messages according to the correspondence
Transport layer port number data message, can cause the network equipment when being sent to the message of terminal, directly to the access
The access point apparatus forwarding of the terminal, the access point apparatus without passing through the terminal attaching again are transmitted to the access for accessing the terminal
Point device, so that the problem of avoiding the occurrence of flow detour.
With reference to second aspect, in the first possible implementation of second aspect, described access point equipment is empty for NAT
Propose any appliance in standby group, described access point equipment with the NAT virtual units group in addition to described access point equipment
Equipment use synchronous NAT conversational lists.
With reference to the possible implementation of the first of second aspect and second aspect, second in second aspect may
Implementation in, the network equipment according to the correspondence with the physical port forward the data message it
Before, further include：
The network equipment determines that the next-hop of the data message is directed toward institute according to the destination address of the data message
State the nat port group of the network equipment.
The next-hop that the network equipment finds the data message according to the destination address of data message is directed toward the network equipment
Nat port group, the biography after the NAT for the destination slogan field that the data message can be directly inquired into the nat port group
Physical port corresponding to defeated layer port numbers, the data message forwarding of terminal will be sent to by the physical port, can be to avoid again
The access point apparatus for accessing the terminal is transmitted to by the access point apparatus of the terminal attaching, so as to avoid the occurrence of flow detour
Problem.
A kind of third aspect, there is provided access point apparatus.The access point apparatus includes performing first aspect or its any realization
The module of the method for mode.
A kind of fourth aspect, there is provided network equipment.The network equipment includes performing second aspect or its any implementation
Method module.
5th aspect, there is provided a kind of access point apparatus, including：Transceiver and processor.Processor is used to perform first party
The method that face or the arbitrary implementation of first aspect provide.
6th aspect, there is provided a kind of network equipment, including：Transceiver and processor.Processor is used to perform second aspect
Or the method that the arbitrary implementation of second aspect provides.
7th aspect, there is provided a kind of computer-readable storage medium, the processor that the 5th aspect offer is used for for storing perform
Computer software instructions, for performing the method that first aspect and the possible implementation of first aspect provide.
Eighth aspect, there is provided a kind of computer-readable storage medium, for storing the processor execution for being used for the 6th aspect and providing
Computer software instructions, for performing the method that second aspect and the possible implementation of second aspect provide.
Brief description of the drawings
, below will be to attached needed in embodiment description in order to illustrate more clearly of the technical solution in the application
Figure is briefly introduced.
Fig. 1 is a kind of schematic diagram of flow forwarding；
Fig. 2 is a kind of schematic diagram for system architecture that the application provides；
Fig. 3 is a kind of flow diagram of the method for renewal NAT session entries that the application provides；
Fig. 4 is the schematic diagram that a kind of access point apparatus that the application provides is interacted with main equipment；
Fig. 5 is the schematic diagram that a kind of access point apparatus that the application provides is interacted with main equipment；
Fig. 6 is a kind of schematic diagram for system architecture that the application provides；
Fig. 7 is a kind of structure diagram for access point apparatus that the application provides；
Fig. 8 is a kind of structure diagram for network equipment that the application provides；
Fig. 9 is a kind of structure diagram for access point apparatus that the application provides；
Figure 10 is a kind of structure diagram for network equipment that the application provides.
Embodiment
In order to make the purpose, technical scheme and advantage of the application clearer, below in conjunction with accompanying drawings and embodiments to this
Application is described in further detail.
Fig. 2 shows a kind of system architecture that the application is applicable in, and can be realized based on the system architecture to renewal network
Location conversion (English：Network address translation, NAT) session entry control, the application provide renewal
The system architecture of NAT session entries includes the network equipment 201, NAT virtual units group 202 and multiple STA203.
As shown in Fig. 2, the NAT virtual units group 202 includes AP1 and AP2.The network equipment 201 and NAT virtual unit groups
202 physical ports being connected are configured with nat port group.After the NAT of STA being provided with the nat port group of the network equipment 201
The correspondence of transport layer port number and physical port, so that use when to STA forwarding data packets of the network equipment 202 exists
The destination slogan of data message is obtained in nat port group according to the correspondence as corresponding to the transport layer port number after NAT
Physical port forwarding.Establish CAPWAP tunnel between AP1 and AP2 in NAT virtual units group 202, AP1 and AP2 can be with
Communicated with the CAPWAP tunnel, the AP1 and AP2 be with WLAN service ability AP.
, it is necessary to be configured in advance to the NAT virtual unit groups, concrete configuration method when using NAT virtual unit groups
It is as follows.
As shown in Fig. 2, AP1 and AP2 are designated as a NAT virtual unit group.Selected by way of configuring or campaigning for
The main equipment come in the NAT virtual unit groups is enumerated, the equipment with high priority can set as the master of NAT virtual unit groups
Standby, surplus equipment is slave device.The main equipment is used to distribute in NAT virtual unit groups each NAT session entries in NAT conversational lists
NAT after transport layer port number.For example, AP1 has been configured to NAT main equipments, AP1 can be that AP2 is distributed in NAT conversational lists
Transport layer port number after the NAT of each NAT session entries.By the physics end of the AP connections network equipment in NAT virtual unit groups
Mouth is added in nat port group.
Based on foregoing description, Fig. 3 show the application provide a kind of guiding, forwarding data packets method flow,
As shown in figure 3, this method flow specifically includes：
Step 301, access point apparatus determines the NAT session entries of terminal.
In this application, terminal is wlan device.For example, terminal can be equipped with the computer of wireless network card, can also
It is the mobile phone for having WLAN module.
The NAT session entries of the terminal include the transport layer port number after NAT, and access point apparatus carrys out self terminal receiving
Data to be forwarded message when, according to NAT session entries by this come the source address and source of the data to be forwarded message of self terminal
Slogan is converted to the source address after NAT and source port number.Above-mentioned port numbers are transport layer port number, such as User Datagram Protocol
(English：User Datagram Protocol, UDP) port numbers or transmission control protocol (English：Transmission
Control Protocol, TCP) port numbers.The source port number for carrying out the data to be forwarded message of self terminal is the number to be forwarded
According to a field in message.The NAT session entries include source internet protocol (English：Internet Protocol, IP)
The transport layer port number after IP address, NAT after location, source port number, NAT.Alternatively, which further comprises
Purpose IP address and destination slogan etc..The NAT session entries can be as shown in table 1.
Table 1
| Source IP address | Source port number | IP address after NAT | Transport layer port number after NAT |
| 10.1.1.1 | 1025 | 1.1.1.1 | 19286 |
| 10.1.1.2 | 1001 | 1.1.1.1 | 19287 |
In this application, access point apparatus is any appliance in NAT virtual unit groups, and the access point apparatus is empty with NAT
Propose the equipment gone out in standby group outside the access point apparatus includes terminal using synchronous NAT conversational lists, the NAT conversational lists
NAT session entries.
The access point apparatus uses synchronous NAT meetings with going out the equipment outside the access point apparatus in NAT virtual unit groups
Table is talked about, there are following several situations：
The first situation, the NAT conversational lists that all devices use in the NAT virtual unit groups are identical.One of equipment
On NAT session entries when changing, can be with active synchronization NAT conversational lists.Alternatively, the NAT meetings in each equipment of periodic synchronization
Talk about table.All devices can use the NAT conversational lists after synchronization in the NAT virtual unit groups.
The second situation, when on terminal roaming to access point apparatus, which sets to the ownership of the terminal
Preparation send NAT session entry request messages, all NAT conversational lists in the equipment for the ownership for obtaining the terminal on the terminal
, so that the access point apparatus uses synchronous NAT session entries with the equipment of the ownership of the terminal.
The third situation, based on above-mentioned the second situation, access point apparatus is in the equipment of ownership for getting the terminal
During all NAT session entries on the terminal, the equipment of the ownership of the terminal can be by the NAT session entries on the terminal
Delete after a set time, which can empirically be set.
4th kind of situation, based on above-mentioned the second situation, can speculate in advance before terminal roaming to access point apparatus
The terminal may roam into the access point apparatus from its adjacent equipment.Access point apparatus shifts to an earlier date the terminal that may be roamed into this
All NAT session entries of the device request of ownership on the terminal.Alternatively, controller makes above-mentioned supposition, and command terminal
The equipment of ownership sends all NAT session entries of the terminal to the access point apparatus.
Step 302, NAT session announcement messages are sent to the network equipment for access point apparatus.
The NAT session announcements message includes the transport layer port number after NAT definite in above-mentioned steps 301, the NAT sessions
Notification packet can indicate that the physical port of network equipment reception NAT session announcement messages is sent to the destination slogan of terminal
For the data message of the transport layer port number after NAT.So that the network equipment directly transmits the data message for being sent to terminal
To the access point apparatus of terminal access, the data message without this to be sent to terminal again is set by the access point of the terminal attaching
The problem of for being forwarded to the access point apparatus that the terminal accesses, avoiding the occurrence of flow detour, reduce the access of the terminal attaching
The traffic overhead of point device.
Under access point apparatus two kinds of scenes below NAT session announcement messages are sent to the network equipment.
Scene one
Access point apparatus is connected to the access point apparatus in terminal, and when to determine terminal be roaming terminal, to the network equipment
Send NAT session announcement messages.
When there is terminal to be linked into access point apparatus, access point apparatus it needs to be determined that the terminal be new terminal or from its
His equipment roams through the roaming terminal come.Specifically, after terminal access access point apparatus, access point apparatus can be in terminal Biao Neisheng
Into a flag bit, by flag bit come identify the terminal of the access be new terminal or from other equipment roam through come
Roaming terminal.The equipment of roaming terminal ownership notifies after the roaming terminal is roamed to access point apparatus to access point apparatus
The information of the peripatetic device, so that access point apparatus is labeled the roaming terminal, for example access point apparatus will can roam
Terminal is labeled as 1, and new terminal is labeled as 0.
Access point apparatus to the network equipment before NAT session announcement messages are sent, it is necessary to first determine the NAT sessions of terminal
List item.Specifically, being main equipment or slave device according to the access point apparatus, will be described by following two ways：
Mode one
When access point apparatus is the main equipment in NAT virtual unit groups, which can directly store from itself
NAT conversational lists in determine the NAT session entries of the terminal.Since main equipment can distribute the NAT meetings of NAT virtual unit groups
The transport layer port number after the NAT of each NAT session entries in table is talked about, its NAT conversational list stored includes all terminals
NAT session entries, therefore, access point apparatus can directly determine the NAT session entries of the terminal.
Mode two
When access point is the slave device in NAT virtual unit groups, flow as shown in Figure 4：
Step S401, main equipment of the access point apparatus into NAT virtual unit groups send NAT session entries request report
Text, the source IP address of the terminal is included in the NAT session entry request messages, for asking main equipment to inquire about the terminal
NAT session entries.
Step S402, main equipment receive access point apparatus transmission NAT session entry request messages after, according to
The source IP address of terminal in NAT session entry request messages, inquires about the NAT of the terminal from the NAT conversational lists of itself storage
Session entry.The NAT session entries (if present) of the terminal can have one or more in NAT conversational lists.The NAT meetings
Talk about the IP address after NAT of the list item including the terminal and the transport layer port number after NAT.
Step S403, main equipment send NAT session entry response messages, NAT session entries response to access point apparatus
Message includes the transport layer port number after the NAT of the terminal.Since the IP address after the NAT of terminal can be default value, NAT
Session entry response message can not include the IP address after the NAT of the terminal.If the IP address after the NAT of terminal is not silent
Recognize value, which further includes the IP address after the NAT of the terminal.
Step S404, after access point apparatus receives the NAT session entry response messages of main equipment transmission, according to this
The transport layer port number after NAT in NAT session entry response messages generates the NAT session entries of the terminal, generates such as the institute of table 1
Show the NAT session entries of the terminal of form.
Scene two
When lacking the NAT session entries for the message to be forwarded that terminal is sent in the NAT conversational lists of access point apparatus, the access
Point device needs to generate new NAT session entries for the message to be forwarded.After the NAT in the new NAT session entries
Transport layer port number be different from other already present NAT session entries in NAT after transport layer port number, access point apparatus to
The network equipment sends NAT session announcement messages.
The NAT session entries for lacking the message to be forwarded in the NAT conversational lists of the access point apparatus refer to that the access point is set
The standby NAT session entries not inquired from NAT conversational lists on matching with the message to be forwarded.At this time, access point is set
It is standby to need to generate the NAT session entries of the message to be forwarded for the message to be forwarded.Specifically, it is main according to the access point apparatus
Equipment or slave device, access point apparatus will be described by following two ways and generates the message to be forwarded for the message to be forwarded
NAT session entries flow.
Mode one
When access point apparatus is the main equipment in NAT virtual unit groups, which can directly generate this and wait to turn
The NAT session entries of data message are sent out, access point apparatus can be that the data to be forwarded message distributes the transport layer port after NAT
Number, then the transport layer port number after foundation NAT generates the NAT session entries of the data to be forwarded message.Access point apparatus is given birth to
The NAT session entries of the forwarding data packets itself are being stored after into the NAT session entries of the data to be forwarded message.
Mode two
When access point is the slave device in NAT virtual unit groups, flow as shown in Figure 5：
Step S501, main equipment of the access point apparatus into NAT virtual unit groups send NAT session entries request report
Text, the source IP address of the data to be forwarded message is included in the NAT session entry request messages, for asking main equipment to generate
The NAT session entries of the terminal.
Step S502, main equipment receive access point apparatus transmission NAT session entry request messages after, according to
The source IP address of the data to be forwarded message in NAT session entry request messages, after distributing NAT for the data to be forwarded message
Transport layer port number, the NAT session entries of the data to be forwarded message are then generated according to the transport layer port number after NAT,
And in the NAT session entries of the forwarding data packets.
Step S503, main equipment send NAT session entry response messages, NAT session entries response to access point apparatus
Message includes the transport layer port number after the NAT of the data to be forwarded message.
Step S504, after access point apparatus receives the NAT session entry response messages of main equipment transmission, according to this
The transport layer port number after NAT in NAT session entry response messages generates the NAT session entries of the data to be forwarded message.
Step 303, the network equipment receives the NAT session announcement messages that access point apparatus is sent.The NAT session announcement messages
Including the transport layer port number after NAT.Since the IP address after the NAT of terminal can be default value, NAT session announcement messages can
Not include the IP address after the NAT of the terminal.If the IP address after the NAT of terminal is not default value, the NAT session announcements
Message further includes the IP address further included after NAT of the terminal.
Step 304, physics of the transport layer port number after network equipment generation NAT with receiving the NAT session announcement messages
The correspondence of port.The network equipment is according to the transport layer port number after the NAT received in step 302 and receives NAT meetings
The physical port of notification packet is talked about, generates physical port of the transport layer port number after NAT with receiving the NAT session announcement messages
Correspondence, and be stored in the nat port group of the network equipment.Transport layer port number after NAT is led to receiving the NAT sessions
The correspondence for accusing the physical port of message can be as shown in table 2.
Table 2
Step 305, the network equipment receives data message.The destination address of the data message is for the IP after the NAT of terminal
Location.The destination slogan that the data message includes is the transport layer port number after NAT.The network equipment is according to the mesh of the data message
Address obtain corresponding nat port group.Specifically, the network equipment can determine the number according to the destination address of data message
The nat port group of the network equipment is directed toward according to the next-hop of message, so as to inquire about the mesh of the data message in the nat port group
Port numbers be NAT after transport layer port number be corresponding physical port.The network equipment inquires NAT with the destination slogan
The corresponding physical port for sending datagram of transport layer port number in port set after NAT.The data message is to come from
The message of network destined terminal.The network equipment, can when obtaining corresponding nat port group according to the destination address of the data message
To be that multiple destination addresses correspond to a nat port group, first pass through destination address and determine nat port group, further according to destination
Slogan inquires the corresponding thing for sending datagram of transport layer port number after NAT from the nat port group determined
Manage port.Can also be that a destination address corresponds to a nat port group, the network equipment is looked into according to the destination address of data message
Nat port group is ask, can directly inquire the corresponding physics end for sending datagram of the transport layer port number after NAT
Mouthful.
Step 306, the network equipment forwards the data message with above-mentioned physical port.
The network equipment is sent datagram after physical port is inquired using the physical port, it is possible to directly will
Data message is sent to the access point apparatus of terminal access, and the access point apparatus without passing through the terminal attaching again is transmitted to
The access point apparatus of the terminal is accessed, so that the problem of avoiding the occurrence of flow detour.
In the above-described embodiments, the physical port of network equipment reception NAT session announcement messages is connected with access point apparatus.
Therefore the data message that the network equipment is forwarded with the physical port can be sent to the access point for sending NAT session announcement messages
Equipment, avoids the problem that flow detour.Access point apparatus by the data message for being sent to terminal be directed to the network equipment when
Through determining the NAT session entries of the terminal, mesh in the data message of terminal can will be sent to according to the NAT session entries of the terminal
IP address field NAT after IP address and destination slogan field NAT after transport layer port number be converted to NAT conversion
Preceding address and port numbers.Therefore, enter point device by the data message for being sent to terminal be directed to the network equipment when can be just
Really perform NAT.The data message of terminal is sent in addition, being distinguished using the destination slogan of data message as granularity, can allow difference
Terminal share the IP address after identical NAT, improve the flexibility of roaming.
In order to preferably explain the technical solution of the application, guiding, forwarding will be described by specific implement scene below
The flow of data message.
Scene one
As shown in Fig. 2, STA1 after AP1 reaches the standard grade, it is necessary to access Internet resources, it is necessary to send access internet report
Text, AP1 inquiries find the corresponding NAT session entries of message without the access internet, need this when to generate NAT conversational lists
, when AP1 find oneself be exactly NAT virtual unit groups main equipment, directly distribution one NAT after transport layer port number, such as
Src shown in Fig. 2:10.1.1.1:Transport layer port number after the NAT that the message of 1025 access internet is allocated is
19286, wherein, 10.1.1.1 is source IP address, and 1025 be source port number, and 1.1.1.1 is the IP address after NAT, and 19286 are
Transport layer port number after NAT, then generates the NAT session entries of the message of the access internet and is stored.AP1 is based on
Message from the NAT session entries of the message of the access internet to the access internet of network equipment forwarding STA2, and to the net
Network equipment sends NAT session announcement messages.
STA2 will access Internet resources, it is necessary to send the message for accessing internet, AP2 inquiries are found after AP2 reaches the standard grade
The corresponding NAT session entries of message without the access internet, need to generate NAT session entries this when.Since AP1 is main
Equipment, AP2 initiate NAT session entry request messages to AP1, and the transport layer port number 19287 after AP1 distribution NAT is to STA2
The message of internet is accessed, generates the NAT session entries of the message of the access internet, and is stored, is sent to AP2, AP2
The NAT session entries of message based on the access internet to the network equipment forwarding STA2 access internet message, and to
The network equipment sends NAT session announcement messages.
When the network equipment receives the NAT session announcement messages that AP1 and AP2 is sent, lead to according to the NAT sessions received
Accuse the correspondence of physical port of the transport layer port number after message generation NAT with receiving the NAT session announcement messages, storage
It is specific as shown in table 3 in nat port group.
Table 3
After completing as above step, STA can normally access Internet resource, and relevant forward-path is：
The message that STA1 accesses internet carries out NAT conversions on AP1, is substituted for the IP address after NAT as the biography after 1.1.1.1, NAT
Defeated layer port numbers are 19286 message, which is forwarded to after being sent to the network equipment.The message of STA1 is sent to from internet
After reaching the network equipment, the network equipment finds that next-hop is directed toward nat port group, can be based on the message that STA1 is sent to from internet
Destination slogan 19286 carried out in nat port group inquiry port numbers be 19286 NAT after transport layer port number correspond to
Physical port, it is port1 to inquire physical port, message is sent to AP1 from port1, message is sent to by AP1 again
STA1。
Scene two
As shown in fig. 6, when STA1 roams into AP2, AP2 can actively be sent to the main equipment AP1 of NAT virtual unit groups
NAT session entry request messages, request and the relevant NAT session entries of STA1, should be with the relevant NAT meetings of STA1 after inquiring
The transport layer port number after NAT in words list item is sent to AP2, identical NAT session entries is generated at itself in AP2, such as table 4
It is shown.AP2 sends NAT session announcement messages to the network equipment, and notice port numbers are the transport layer port number after 19286 NAT
STA had been switched to AP2 equipment, after the network equipment receives the NAT session announcement messages, after generating the new NAT
The correspondence of physical interface of the transport layer port number with receiving the NAT session announcement messages, as shown in table 5.
Table 4
Table 5
After the message that STA1 is sent to from internet reaches the network equipment, the network equipment finds that next-hop is directed toward NAT ends
Mouth group, can carry out inquiry port based on the destination slogan 19286 for the message that STA1 is sent to from internet in nat port group
Number for 19286 NAT after the corresponding physical port of transport layer port number, it is port2 to inquire physical port, by message from
Port2 is sent to AP2, and message is sent to STA1 by AP2 again.
Fig. 7 shows that, this application provides a kind of access point apparatus, which can perform guiding data message
Flow.
As shown in fig. 7, the access point apparatus specifically includes：Processing unit 701, Transmit-Receive Unit 702；
Processing unit 701, for determining the NAT session entries of terminal, the NAT session entries of the terminal are including after NAT
Transport layer port number；
Transmit-Receive Unit 702, for sending the definite NAT session announcement messages of the processing unit 701, institute to the network equipment
Stating NAT session announcements message includes the transport layer port number after the NAT, and the NAT session announcements message indicates the network
The destination slogan that the physical port of the equipment reception NAT session announcements message is sent to the terminal is the NAT
The data message of transport layer port number afterwards.
The processing unit 701 and the idiographic flow performed by the Transmit-Receive Unit 702 are specific in the above-described embodiments
Description, repeats no more.
Based on identical technical concept, Fig. 8 shows that, this application provides a kind of network equipment, which can hold
The flow of the above-mentioned forwarding data packets of row.
As shown in figure 8, the network equipment specifically includes：Transmit-Receive Unit 801 and processing unit 802；
Transmit-Receive Unit 801, for receiving the NAT session announcement messages of access point apparatus transmission, the NAT session announcements report
Text includes the transport layer port number after NAT；
Processing unit 802, for generating the transport layer port number after the NAT with receiving the NAT session announcements message
Physical port correspondence；
The Transmit-Receive Unit 801 is additionally operable to receive data message, and the destination slogan of the data message is after the NAT
Transport layer port number；And the data message is forwarded according to the correspondence physical port.
The processing unit 802 and the idiographic flow performed by the Transmit-Receive Unit 801 are specific in the above-described embodiments
Description, repeats no more.
Based on same idea, referring to Fig. 9, a kind of access point apparatus 900 provided for the application.The access point apparatus 900
The function of the step of access point apparatus is implemented in the various embodiments described above or execution can be performed.The access point apparatus 900 can wrap
Include：Transceiver 901, processor 902 and memory 903.Processor 902 is used for the operation for controlling access point apparatus 900；Memory
903 can include read-only storage and random access memory, be stored with the instruction and data that processor 902 can perform.Receive
Each components such as hair device 901, processor 902 and memory 903 are connected by bus 909, and wherein bus 909, which is removed, includes data/address bus
Outside, power bus, controlling bus and status signal bus in addition can also be included.But for the sake of clear explanation, will in figure
Various buses are all designated as bus 909.Transceiver 901 can be transceiver, can include transmitter and receiver.The access point is set
Standby 900 can be communicated by cable port or radio port with other equipment, such as router, repeater.
A kind of method for guiding data message that the application discloses can be applied in processor 902, or by processor
902 realize.
Processor 902 is used to read code in memory 903, for performing the flow of guiding data message.
Based on same idea, referring to Figure 10, a kind of network equipment 1000 provided for the application.The network equipment 1000 can
To perform the function of the step of access point apparatus is implemented in the various embodiments described above or execution.The network equipment 1000 may include：
Transceiver 1001, processor 1002 and memory 1003.Processor 1002 is used for the operation for controlling the network equipment 1000；Memory
1003 can include read-only storage and random access memory, be stored with the instruction and data that processor 1002 can perform.
Each components such as transceiver 1001, processor 1002 and memory 1003 are connected by bus 1009, and wherein bus 1009 is removed and included
Outside data/address bus, power bus, controlling bus and status signal bus in addition can also be included.But for the sake of clear explanation,
Various buses are all designated as bus 1009 in figure.Transceiver 1001 can be transceiver, can include transmitter and receiver.
The network equipment 1000 can be communicated by cable port or radio port with other equipment, such as router, repeater.
The network equipment 1000 can realize the process of the inquiry table from nat port group by processor 1002, can also pass through one
Query facility, the process of inquiry table from nat port group.
A kind of method for forwarding data packets that the application discloses can be applied in processor 1002, or by processor
1002 realize.
Processor 1002 is used to read code in memory 1003, for performing the flow of forwarding data packets.
It should be understood by those skilled in the art that, embodiments herein can be provided as method or computer program product.
Therefore, the application can be using the embodiment in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Form.Deposited moreover, the application can use to can use in one or more computers for wherein including computer usable program code
The shape for the computer program product that storage media is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
Formula.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property, then other change and modification can be made to these embodiments.So appended claims are intended to be construed to include preferably in fact
Apply example and fall into all change and modification of the application scope.
Obviously, those skilled in the art can be to the various modification and variations of the application without departing from scope of the present application.
In this way, if these modifications and variations of the application belong within the scope of the application claim and its equivalent technologies, then originally
Application is also intended to comprising including these modification and variations.
Claims (20)
- A kind of 1. method for guiding data message, it is characterised in that including：Access point apparatus determines the network address translation NAT session entries of terminal, and the NAT session entries of the terminal include NAT Transport layer port number afterwards；Described access point equipment sends NAT session announcement messages to the network equipment, and the NAT session announcements message includes described Transport layer port number after NAT, the NAT session announcements message indicate that the network equipment receives the NAT session announcements The destination slogan that the physical port of message is sent to the terminal is the datagram of the transport layer port number after the NAT Text.
- 2. the method as described in claim 1, it is characterised in that described access point equipment connects described access point in the terminal Equipment, and the NAT session announcements message is sent to the network equipment when terminal is roaming terminal.
- 3. method as claimed in claim 1 or 2, it is characterised in that described access point equipment is appointing in NAT virtual unit groups One equipment, described access point equipment use synchronous with the equipment in the NAT virtual units group in addition to described access point equipment NAT conversational lists, the NAT conversational lists include the NAT session entries of the terminal.
- 4. method as claimed in claim 3, it is characterised in that the NAT virtual units group includes main equipment and slave device, institute The transport layer port number in the NAT conversational lists of NAT virtual unit groups after the NAT of each NAT session entries is stated by the main equipment Distribution；Wherein,Access point apparatus determines the NAT session entries of terminal, including：When described access point equipment is the main equipment in the NAT virtual units group, described access point equipment determines the access The NAT session entries of terminal in the NAT conversational lists of point device；When described access point equipment is the slave device in NAT virtual unit groups, described access point equipment is to the NAT virtual units Main equipment in group sends NAT session entry request messages, and receives the NAT session entries response report that the main equipment is sent Text, the transport layer port number in the NAT session entries response message generate the NAT session entries of the terminal.
- 5. the method as described in claim 1, it is characterised in that described access point equipment is treated from the terminal receiving When E-Packeting, and lacking the NAT session entries of the message to be forwarded in the NAT conversational lists of described access point equipment, for institute The NAT session entries that message to be forwarded generates the message to be forwarded are stated, and sends the NAT sessions to the network equipment and leads to Message is accused, wherein the transport layer port number after the NAT is the biography after the NAT in the NAT session entries of the message to be forwarded Defeated layer port numbers.
- 6. the method as described in claim 1 or 5, it is characterised in that described access point equipment is appointing in NAT virtual unit groups One equipment, described access point equipment use synchronous with the equipment in the NAT virtual units group in addition to described access point equipment NAT conversational lists, the NAT conversational lists include the NAT session entries of the terminal.
- 7. method as claimed in claim 6, it is characterised in that the NAT virtual units group includes main equipment and slave device, institute The transport layer port number in the NAT conversational lists of NAT virtual unit groups after the NAT of each NAT session entries is stated by the main equipment Distribution；Wherein,The NAT session entries of the message to be forwarded are generated for the message to be forwarded, including：When described access point equipment is the main equipment in the NAT virtual units group, described access point equipment generates and stores institute State the NAT session entries of data to be forwarded message；When described access point equipment is the slave device in NAT virtual unit groups, described access point equipment is to the NAT virtual units Main equipment in group sends NAT session entry request messages, and receives the NAT session entries response report that the main equipment is sent Text, the transport layer port number in the NAT session entries response message generate the NAT sessions of the data to be forwarded message List item.
- A kind of 8. method of forwarding data packets, it is characterised in that including：The network equipment receives the network address translation NAT session announcement messages that access point apparatus is sent, the NAT session announcements report Text includes the transport layer port number after NAT；Described in transport layer port number and reception after the network equipment generation NAT The correspondence of the physical port of NAT session announcement messages；The network equipment receives data message, and the destination slogan of the data message is the transport layer port after the NAT Number；The network equipment forwards the data message according to the correspondence physical port.
- 9. method as claimed in claim 8, it is characterised in that described access point equipment is any in NAT virtual unit groups Equipment, described access point equipment use synchronous with the equipment in the NAT virtual units group in addition to described access point equipment NAT conversational lists.
- 10. method as claimed in claim 9, it is characterised in that in the network equipment according to being used the correspondence Before physical port forwards the data message, further include：The network equipment determines that the next-hop of the data message is directed toward the net according to the destination address of the data message The nat port group of network equipment.
- A kind of 11. access point apparatus, it is characterised in that including：Processing unit, for determining the network address translation NAT session entries of terminal, the NAT session entries of the terminal include Transport layer port number after NAT；Transmit-Receive Unit, for the NAT session announcement messages determined to the network equipment transmission processing unit, the NAT sessions Notification packet includes the transport layer port number after the NAT, and the NAT session announcements message indicates that the network equipment receives The destination slogan that the physical port of the NAT session announcements message is sent to the terminal is the transport layer after the NAT The data message of port numbers.
- 12. access point apparatus as claimed in claim 11, it is characterised in that the Transmit-Receive Unit is additionally operable to：Described access point equipment is connected in the terminal, and to described in the network equipment transmission when terminal be roaming terminal NAT session announcement messages.
- 13. the access point apparatus as described in claim 11 or 12, it is characterised in that described access point equipment virtually sets for NAT Any appliance in standby group, described access point equipment and setting in addition to described access point equipment in the NAT virtual units group It is standby to include the NAT session entries of the terminal using synchronous NAT conversational lists, the NAT conversational lists.
- 14. access point apparatus as claimed in claim 13, it is characterised in that the NAT virtual units group include main equipment and Slave device, the transport layer port number in the NAT conversational lists of the NAT virtual units group after the NAT of each NAT session entries is by institute State main equipment distribution；Wherein,The processing unit is specifically used for：When described access point equipment is the main equipment in the NAT virtual units group, the NAT sessions of described access point equipment are determined The NAT session entries of terminal in table；When described access point equipment is the slave device in NAT virtual unit groups, virtually set to the NAT by the Transmit-Receive Unit Main equipment in standby group sends NAT session entry request messages, and receives what the main equipment was sent by the Transmit-Receive Unit NAT session entry response messages, the transport layer port number in the NAT session entries response message generate the terminal NAT session entries.
- 15. access point apparatus as claimed in claim 11, it is characterised in that the processing unit is additionally operable to：The message to be forwarded from the terminal is being received, and is lacking the NAT of the message to be forwarded in the NAT conversational lists During session entry, the NAT session entries of the message to be forwarded are generated for the message to be forwarded, and pass through the Transmit-Receive Unit The NAT session announcements message is sent to the network equipment, wherein the transport layer port number after the NAT is described to be forwarded The transport layer port number after NAT in the NAT session entries of message.
- 16. the access point apparatus as described in claim 11 or 15, it is characterised in that described access point equipment virtually sets for NAT Any appliance in standby group, described access point equipment and setting in addition to described access point equipment in the NAT virtual units group It is standby to include the NAT session entries of the terminal using synchronous NAT conversational lists, the NAT conversational lists.
- 17. access point apparatus as claimed in claim 16, it is characterised in that the NAT virtual units group include main equipment and Slave device, the transport layer port number in the NAT conversational lists of the NAT virtual units group after the NAT of each NAT session entries is by institute State main equipment distribution；Wherein,The processing unit is specifically used for：When described access point equipment is the main equipment in the NAT virtual units group, generates and store the data to be forwarded report The NAT session entries of text；When described access point equipment is the slave device in NAT virtual unit groups, virtually set to the NAT by the Transmit-Receive Unit Main equipment in standby group sends NAT session entry request messages, and receives what the main equipment was sent by the Transmit-Receive Unit NAT session entry response messages, the transport layer port number generation in the NAT session entries response message are described to be forwarded The NAT session entries of data message.
- A kind of 18. network equipment, it is characterised in that including：Transmit-Receive Unit, for receiving the network address translation NAT session announcement messages of access point apparatus transmission, the NAT sessions Notification packet includes the transport layer port number after NAT；Processing unit, for the physics end for generating the transport layer port number after the NAT with receiving the NAT session announcements message The correspondence of mouth；The Transmit-Receive Unit is additionally operable to receive data message, and the destination slogan of the data message is the transmission after the NAT Layer port numbers；And the data message is forwarded according to the correspondence physical port.
- 19. the network equipment as claimed in claim 18, it is characterised in that described access point equipment is in NAT virtual unit groups Any appliance, the equipment in described access point equipment and the NAT virtual units group in addition to described access point equipment uses Synchronous NAT conversational lists.
- 20. the network equipment as claimed in claim 19, it is characterised in that the processing unit is additionally operable to：Before the Transmit-Receive Unit forwards the data message according to the correspondence with the physical port, according to described The destination address of data message determines that the next-hop of the data message is directed toward the nat port group of the network equipment.
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| CN201610931373.XA CN108011986B (en) | 2016-10-31 | 2016-10-31 | Method for guiding and forwarding data message, access point equipment and network equipment |
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| CN201610931373.XA CN108011986B (en) | 2016-10-31 | 2016-10-31 | Method for guiding and forwarding data message, access point equipment and network equipment |
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| WO2005008996A1 (en) * | 2003-07-03 | 2005-01-27 | Sinett Corporation | Method of supporting mobility and session persistence across subnets in wired and wireless lans |
| US20070298848A1 (en) * | 2006-06-21 | 2007-12-27 | Babin Stephen W | Method of pausing keep-alive messages and roaming for virtual private networks on handheld devices to save battery power |
| CN105792174A (en) * | 2014-12-26 | 2016-07-20 | 华为技术有限公司 | Wireless local area network roaming method, access point and wireless controller |
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