CN101764757B - Method, device and system for content accessing - Google Patents
Method, device and system for content accessing Download PDFInfo
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- CN101764757B CN101764757B CN 201010034376 CN201010034376A CN101764757B CN 101764757 B CN101764757 B CN 101764757B CN 201010034376 CN201010034376 CN 201010034376 CN 201010034376 A CN201010034376 A CN 201010034376A CN 101764757 B CN101764757 B CN 101764757B
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Abstract
The invention discloses a method, a device and a system for content accessing. The content accessing method comprises: monitoring a user message, obtaining and storing the corresponding relationship between the IP address of the user and PPP session information; receiving a content accessing request sent by the user; sending the content accessing request to the edge server of a content delivery network; and according to the corresponding relationship, forwarding the content which is provided for the user by the edge server according to the request to the user. The technical scheme can avoid information exchange between broadband wholesale providers such as ILEC, and broadband retailers such as CLEC, thereby improving content accessing efficiency and saving network resource occupied by the content accessing.
Description
Technical field
The present invention relates to the network communications technology field, be specifically related to the access to content technical field.
Background technology
The wholesale provider in broadband such as Incumbent Local Exchange Carrier (traditional LEC; ILEC) can be with wholesale broadband retailer such as the Competitive Local ExchangeCarrier (Competitive Local Exchange Carrier given of the copper cash of oneself; CLEC), promptly ILEC can open the copper cash resource to CLEC.After the open copper cash resource of ILEC; CLEC can pass through Layer Two Tunneling Protocol (Layer 2 Tunneling Protocol, L2TP) for the user provides broadband services, promptly CLEC is used as the BAS Broadband Access Server BRAS of ILEC as L2TP Access Concentrator (L2TP Access Concentrator; LAC); (L2TP Network Server, LNS) the termination user is to the visit of Internet, thereby broadband services is provided for the user by the L2TPNetwork Server of CLEC.
Through Content Delivery Network (content distributing network CDN) is shifted content in the applied environment near user's network edge onto, based on the access to content method of L2TP shown in accompanying drawing 1.
Among Fig. 1; The user of CLEC (being the end user among Fig. 1) is through Digital Subscriber LineAccess Multiplexer (Digital Subscriber Line Access Multiplexer; DSLAM) DSLAM and MetropolitanArea Network (metropolitan area network; Metro) be linked into LAC, and through LAC and IP/Multiprotoco LabelSwitching (multiprotocol label switching, MPLS) core net is linked into LNS; CDN Edge Server (CDN Edge Server by LNS control user capture ILEC; CDN ES) or visit the CDNCentral Server (CDN central server, CDN CS) of ILEC or visit the CDN CS of CLEC or visit the CDN ES of CLEC, so that the content that the user obtains to ask.
In realizing process of the present invention, the inventor finds: in the access to content method based on L2TP, the shared Internet resources of access to content efficient and access to content have to be optimized.
Summary of the invention
The access to content methods, devices and systems that embodiment of the present invention provides can improve access to content efficient, and practice thrift the shared Internet resources of access to content.
The access to content method that embodiment of the present invention provides comprises:
The message of monitoring users obtains and stores the corresponding relation between said user's IP address and the point-to-point protocol PPP session information;
Receive the access to content request that said user sends;
Edge Server to content distributing network sends said access to content request, and to transmit said Edge Server according to said corresponding relation to said user be the content that said user provides according to said access to content request.
The content access device that embodiment of the present invention provides comprises:
Monitor module, be used for the message of monitoring users, obtain and store the corresponding relation between said user's IP address and the PPP session information;
Receiver module is used to receive the access to content request that said user sends, and the Edge Server of received content distributing network sends is the content that said user provides according to said access to content request;
Control module is used for sending said access to content request to the Edge Server of content distributing network, and transmits the content that said receiver module receives according to said corresponding relation to said user.
The content access system that embodiment of the present invention provides comprises:
L2TP Access Concentrator LAC; The message that is used for monitoring users; Obtain and store the corresponding relation between said user's IP address and the PPP session information, receive the access to content request that said user sends, send said access to content request to the Edge Server of content distributing network; After receiving the content response message that said Edge Server sends, transmit said content to said user according to said corresponding relation;
The Edge Server of content distributing network is used to receive the access to content request that said LAC sends, and sends content according to said access to content request to said LAC.
Description through technique scheme can be known; Message through monitoring users can obtain and store the corresponding relation between user's IP address and the PPP session information; Utilize this corresponding relation can control the user obtains access to content request correspondence from the Edge Server of content distributing network content; Thereby can avoid the information interaction between ILEC and the CLEC, finally improve access to content efficient, practice thrift the shared Internet resources of access to content.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the access to content method sketch map based on L2TP of prior art;
Fig. 2 is the access to content method flow diagram of the embodiment of the invention one;
Fig. 3 is the protocol stack sketch map of the embodiment of the invention two;
Fig. 4 is the content access device sketch map of the embodiment of the invention three;
Fig. 4 A is the control module sketch map of the embodiment of the invention three;
Fig. 4 B is the control submodule sketch map of the embodiment of the invention three;
Fig. 5 is the content access system sketch map of the embodiment of the invention four.
Embodiment
If the CDN ES or the CDN CS of the wholesale provider in LNS control user capture broadband; Then can cause network traffics circuitous between wholesale provider in broadband and broadband retailer; Not only waste the two layer tunnel resource between wholesale provider in broadband and the broadband retailer, but also prolonged the time that the user carries out access to content.And if LNS controls user capture broadband retailer's CDN ES or CDN CS, then user's access to content process has still taken the two layer tunnel resource between wholesale provider in broadband and the broadband retailer.If LAC can control the user and obtain content from CDN ES; Then can avoid the information interaction between wholesale provider in broadband and the broadband retailer; Thereby not only can practice thrift the two layer tunnel resource between wholesale provider in broadband and the broadband retailer, can also shorten the time of access to content.
Through embodiment the present invention is illustrated from the concrete implementation procedure that CDN ES obtains content through LAC control user below.Obviously, the embodiments described below are the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one, access to content method.The flow process of this method is shown in accompanying drawing 2.
Among Fig. 2, the message of S200, LAC monitoring users obtains and stores the corresponding relation between this user's IP address and the PPP session information.
The object lesson that the message of LAC through monitoring users obtained and stored the corresponding relation between user's IP address and the PPP session information comprises: LAC is through the Point toPoint Protocol (point-to-point protocol between monitoring users and the network side; PPP) message in the negotiations process obtains and stores the corresponding relation between user's IP address and the PPP session information.(IP control protocol IPCP) is consulted for above-mentioned ppp negotiation process of being monitored such as the IP Control Protocol in the ppp negotiation process.Message in the above-mentioned ppp negotiation process of being monitored can comprise: the ppp negotiation message that ppp negotiation message that the user sends and/or LAC send to the user.
Another object lesson that the message of LAC through monitoring users obtained and stored the corresponding relation between user's IP address and the PPP session information comprises: LAC obtains and stores the corresponding relation between user's IP address and the PPP session information through the IP message that monitoring users sends.The above-mentioned IP message is the IP message that the user sends in ppp negotiation success back.
LAC in the present embodiment also can be through obtaining the corresponding relation between user's IP address and the PPP session information to other monitoring by the eavesdropping target, and present embodiment does not limit LAC obtains the corresponding relation between user's IP address and the PPP session information through the message of monitoring users concrete implementation procedure.
Under the situation of BRAS as LAC of broadband retailer such as CLEC wholesale provider such as ILEC with the broadband, the LAC in the present embodiment is the BRAS of ILEC; CLEC with the situation of other physical entity as LAC under, the LAC in the present embodiment also shows as other physical entity accordingly.
In S200, LAC obtains through monitoring and stored relation can comprise: user's IP address and PPP connection identifier.
S210, LAC receive the access to content request that this user sends.
LAC may receive the multiple request that the user sends, and LAC can judge whether the request that receives is the access to content request according to the information of carrying in the request.LAC judges that whether the request receive is that an object lesson of access to content request comprises: when the purpose IP address that LAC carries in judging request belongs to the address realm of content preset server; Judging the request that receives is the access to content request; Otherwise judging the request that receives is non-access to content request.
When LAC judges the request that receives and is not the access to content request; LAC can adopt existing mode that this request is handled; For example; When request that LAC receives during for the request of other website the content of visit in content distributing network, LAC carries out information interaction according to L2TP flow process and LNS, makes the user can above-mentioned other website of successful access.Present embodiment does not limit the concrete processing procedure of LAC to non-access to content request.
S220, LAC send the access to content request to the Edge Server of content distributing network; And the content response message that sends of the Edge Server of received content distributing network; The content response message here comprises that Edge Server according to the content that the access to content request that receives provides for the user, promptly comprises the content that the access to content request is corresponding.LAC transmits the content response message according to above-mentioned stored relation to above-mentioned user; Be that LAC determines the corresponding PPP session information of this content according to above-mentioned stored relation; And utilize the PPP session information that the content response message is encapsulated, and the content response message after the user transmits encapsulation.
Optional; In S220; LAC is before the Edge Server to content distributing network sends the access to content request; Whether the Edge Server that can carry out content distributing network can provide the judgement of the access to content content that request is asked, and for example, LAC judges according to content preset distributing network access strategy whether the Edge Server of content distributing network can provide the access to content content that request is asked; At the Edge Server of judging content distributing network the content of being asked can be provided; LAC sends this access to content request to the Edge Server of content distributing network, at the Edge Server of judging content distributing network the content of being asked can not be provided, and LAC does not send this access to content request to the Edge Server of content distributing network.Edge Server at content distributing network can not provide under the situation of the content of being asked; LAC can adopt existing method to handle this access to content request; Carry out information interaction like LAC according to L2TP flow process and LNS, make the user can above-mentioned other website of successful access etc.
The particular content that content distributing network access strategy in the present embodiment is stored in can the Edge Server according to content distributing network is provided with, and also can whether can get access to content corresponding setting from the central server of content distributing network according to the Edge Server of content distributing network.
An object lesson of content distributing network access strategy comprises: whether the purpose IP address of access to content request belongs to the IP address set that is provided with in advance.Under the situation that adopts this access strategy; Whether the Edge Server of judging content distributing network can provide the process of the access to content content that request is asked can be the purpose IP address that obtains the access to content request; Judge whether this purpose IP address belongs to the IP address set that is provided with in advance; If belong to, the Edge Server of then judging content distributing network can provide the access to content content that request is asked; If do not belong to, the Edge Server of then judging content distributing network can not provide the access to content content that request is asked.
Another object lesson of content distributing network access strategy comprises: whether the index of the content that the access to content request is asked belongs to the content indexing table of content server.Under the situation that adopts this access strategy; Whether the Edge Server of judging content distributing network can provide the process of the access to content content that request is asked to be: the index of confirming the content that the access to content request is asked; This index can be confirmed according to the IP five-tuple of access to content request, also can confirm according to application layer content (like filename); Judge whether this index belongs to the content indexing table of the content server of storage in advance; If belong to; The Edge Server of then judging content distributing network can provide the access to content content that request is asked; If do not belong to, the Edge Server of then judging content distributing network can not provide the access to content content that request is asked.Need to prove, under the situation that index is confirmed according to the IP five-tuple of access to content request, can utilize the partial content (for example destination address) in the IP five-tuple to confirm index, also can confirm index according to the full content in the IP five-tuple.When the source IP address in having adopted the IP five-tuple is confirmed index, can make the content in the Edge Server only offer particular user.
LAC can adopt the mode of being redirected to send the access to content request to the Edge Server of content distributing network.An object lesson that adopts the mode of being redirected to send the access to content request comprises: divest the PPP encapsulation of access to content request, and send the IP message after divesting the PPP encapsulation to the Edge Server of content distributing network.
Optional, not existing in user's IP address under the situation of overlapping phenomenon, promptly any two broadband retailers' user's IP address does not exist under the identical situation, and LAC can directly be redirected to the access to content request Edge Server of content distributing network; And may exist under the situation of overlapping phenomenon in user's IP address; The user's IP address that is a plurality of broadband retailers possibly exist under the identical situation; LAC can be earlier carries out Network Address Translation (network address translation to the source IP address of content access request; NAT) many instance processes afterwards, are redirected to the access to content request according to the source IP address after the many instance processes of NAT the Edge Server of content distributing network again.
The Edge Server of content distributing network sends the content response message to LAC after receiving the access to content request, this content response message comprises the content that the access to content request is asked.The content that the Edge Server of content distributing network sends to LAC can comprise the content of storage in advance; The Edge Server that also can comprise content distributing network after receiving the access to content request that LAC sends, the content of obtaining from the central server of content distributing network according to this access to content request.The content that the Edge Server that the above-mentioned content of storage in advance is a content distributing network had just stored before receiving the access to content request that LAC sends.Need to prove; If whether LAC can not provide the access to content content that request is asked to judge to the Edge Server of content distributing network; When the Edge Server of content distributing network receives when the request of the access to content of content can not be provided from LAC; The Edge Server of content distributing network can adopt redirected mode, makes user's other server (for example other Edge Servers or central server) from content distributing network obtain the content of being asked.
LAC is behind the content response message that the Edge Server that receives content distributing network sends; In user's IP address and the corresponding relation between the PPP session information of storage, search record with the purpose IP matching addresses of content response message; And the content that encapsulation receives according to the PPP session information in the matched record; Afterwards, the content after the user transmits encapsulation.
The purpose IP address of foregoing response message can be the purpose IP address of carrying in the content response message, also can handle purpose IP address that (like the many instance processes of NAT) back obtains for internally holding the purpose IP address of carrying in the response message.Whether the purpose IP address of carrying in the content response message is handled and to depend on whether LAC handles the source IP address of content access request when the Edge Server to content distributing network sends the access to content request.That is to say; If LAC handles the source IP address of content access request when the Edge Server to content distributing network sends the access to content request; Then handle the purpose IP address of the content response message that need be asked this access to content request of LAC; Otherwise handle the purpose IP address of the content response message that LAC need not asked this access to content request.
The content access request has been carried out under the situation of the many instance processes of NAT at LAC; LAC is behind the content response message that the Edge Server that receives content distributing network sends; The many instance processes of NAT are carried out in the purpose IP address of carrying in the content response message; Afterwards, LAC searches the record with the many instance processes of NAT purpose IP matching addresses afterwards in user's IP address of storing and the corresponding relation between the session information, and the content that encapsulation receives according to the PPP session information in the matched record; The purpose IP address of carrying in the content response message after the encapsulation at this moment, be the purpose IP address after the many instance processes of NAT; The content response message of LAC after the user transmits encapsulation.
Can know from above-mentioned description to embodiment one; LAC among the embodiment one can obtain and store the corresponding relation between user's IP address and the PPP session information through the message of monitoring users; Utilize this corresponding relation LAC can control the user obtains access to content request correspondence from the Edge Server of content distributing network content; That is to say; LAC has carried out Bypass Control to user's access to content process, and promptly user's access to content process can arrive the Edge Server of content distributing network again without LNS, but from LAC directly to the Edge Server of content distributing network; Can avoid the information interaction between wholesale provider in broadband and the broadband retailer through LAC to the Bypass Control of user's access to content; Thereby not only can avoid the shared transfer resource of information interaction between wholesale provider in broadband and the broadband retailer based on Layer 2 Tunneling Protocol; Can also avoid the shared access to content time of information interaction; Finally improve access to content efficient, practiced thrift the shared Internet resources of access to content.
Embodiment two, access to content method.Be that the BRAS of LAC, CLEC is that LNS is an example with the BRAS of ILEC below, and combine 3 pairs of present embodiments of accompanying drawing to describe.
Content shown in Fig. 3 comprises: the protocol stack information of the BRAS of the end user's that the access to content method of present embodiment relates to (being the user who puts down in writing in the foregoing description) protocol stack information, the protocol stack information of DSLAM and ILEC.
End user among Fig. 3 can be linked into the BRAS of ILEC through PPPoE earlier, then, be linked into the BRAS of CLEC again through L2TP, thereby the end user reaches the standard grade.Need to prove; Though shown in Fig. 3 is the end user is linked into ILEC through PPPoE BRAS; But the end user also can be linked into the BRAS of ILEC through other PPPoX (like PPPoA or PPPoEoA etc.) except that PPPoE in practical application.
In the line process, the BRAS of ILEC can monitor end user's ppp negotiation process such as the ipcp negotiation process in the ppp negotiation process on above-mentioned end user, thereby obtains end user's the IP address and the corresponding relation of PPP session, and storage.The BRAS of ILEC also can monitor the IP message that the end user sends in ppp negotiation success back, thereby obtains end user's the IP address and the corresponding relation of PPP session, and storage.
The end user when requirements for access is arranged, can send access request after reaching the standard grade, this access request can be the PPPoX message.
The BRAS of ILEC can check that pre-configured content distributing network access strategy is the CDN inspection policy; If according to what check that the result confirms visit to end user is CDN ES, then the BRAS of ILEC can utilize redirecting technique that the PPPoX message is carried out the IP termination and is transmitted to CDN ES.
If according to checking that the access request that the result confirms that the end user sends is the request of other website the content of visit in content distributing network; Then the BRAS of ILEC can carry out information interaction according to the flow process of L2TP and the BRAS of CLEC, handles with the online that realizes the end user.
After CDN ES receives the access to content request; According to the access to content request to the BRAS of ILEC returned content response message; After the BRAS of ILEC receives the content response message that returns; Corresponding relation according to stored IP address and PPPoX session is encapsulated as the PPPoX message with the content response message, and transmits this PPPoX message to the end user.
Access to content method below in conjunction with 3 pairs of present embodiments of accompanying drawing describes.
In Fig. 3, the BRAS of ILEC obtains end user's the PPP session information and the corresponding relation of IP address through the IP message of monitoring end user's ppp negotiation or end user's transmission after the ppp negotiation success, and the BRAS of ILEC stores this corresponding relation.A concrete example of the BRAS stored relation of ILEC is as shown in table 1.
Table 1
In the table 1 the 1st row and the 2nd are classified the BRAS stored relation of ILEC as, and the PPP connection identifier is the PPP session information in the corresponding relation.
Owing to can store PPP connection identifier, user's CLEC information and the corresponding relation between the L2TP link information three usually among the BRAS of existing ILEC; Therefore; The BRAS of ILEC can monitor the corresponding relation of corresponding relation between this three that obtains with present embodiment and store; Promptly increase end user IP address information in the corresponding relation between the three again, thereby formed table 1.
The pre-configured strategy of judging visit to end user CDN ES that is useful on promptly stores the content distributing network access strategy among the BRAS of ILEC among the BRAS of the ILEC of Fig. 3.
During the content of the end user among Fig. 3 in needing the accessed content distributing network, send the IP datagram literary composition of accesses network to the BRAS of ILEC, this IP datagram literary composition is encapsulated in the PPPoE message.
After the BRAS of ILEC among Fig. 3 receives the PPPoE message of end user's transmission; Utilize content that pre-configured strategy judges that the end user asks to visit whether be the corresponding CDNES of the BRAS of this ILEC the content that can provide; Judge content that the end user asks to visit be CDN ES after the content that can provide, the IP datagram literary composition that the end user is sent carries out re-orientation processes.
The object lesson of a re-orientation processes process comprises: the BRAS of ILEC peels the PPPoE head of PPPoE message off, obtains the IP datagram literary composition, and sends the IP datagram literary composition after divesting the PPPoE head to the CDN ES corresponding with the BRAS of this ILEC.
After CDN ES among Fig. 3 receives the IP datagram literary composition that the BRAS of ILEC sends; Confirm the content of end user's needs visit according to the information of carrying in the IP datagram literary composition; And returning the content response message that comprises this content to the BRAS of ILEC, this content response message also is the IP datagram literary composition.CDN ES can adopt existing multiple mode to confirm that the content that the end user need visit, present embodiment do not limit CDNES confirms the content of end user's needs visit according to the information of carrying in the IP datagram literary composition concrete implementation procedure.
After the BRAS of ILEC among Fig. 3 receives the IP datagram literary composition that CDN ES returns; Judge according to the purpose IP address of this IP datagram literary composition whether this IP datagram literary composition is the above-mentioned redirected civilian back message using (being the content response message) of IP datagram; If back message using is then transmitted this back message using to the end user.Judge whether to comprise for an object lesson of back message using and forwarding back message using: mate purpose IP address that the IP datagram that the BRAS of ILEC returns CDN ES is civilian and the end user IP address in the table 1; After finding the record of coupling; The IP datagram literary composition that CDN ES is returned according to the PPP connection identifier in the matched record carries out the PPPoE encapsulation, and will encapsulate the PPPoE message that obtains (IP datagram that also can be called after the PPPoE encapsulation is civilian) and be transmitted to the end user.
What need special instruction is in the description of Fig. 3, not explain whether the BRAS of ILEC need carry out the many instance processes of NAT to the IP datagram that the end user sends IP datagram literary composition civilian and that CDN ES sends above-mentioned.In practical application, the BRAS that can confirm ILEC according to concrete network condition whether needs carries out the many instance processes operations of NAT.For example; If there is overlapping phenomenon in the end user's of different CLEC IP address; Though promptly the end user's among CLEC IP address is unique in this CLEC; But the end user's among CLEC IP address may be identical with end user's among another CLEC IP address, and then the IP datagram literary composition that sends of the BRAS of ILEC IP datagram literary composition that need send the end user and CDN ES carry out the many instance processes of NAT; Otherwise the IP datagram IP datagram literary composition civilian and that CDN ES sends that the BRAS of ILEC can not send the end user carries out the many instance processes of NAT.
The object lesson of many instance processes of NAT process comprises: the information that the IP datagram literary composition that the BRAS of ILEC sends according to the end user carries is confirmed the CLEC under this end user; As in table 1, searching through civilian source IP address and the PPP connection identifier of IP datagram that utilizes the end user to send, then can be from the CLEC information under the CLEC of User list item the matched record that finds is known the end user; The BRAS of ILEC utilizes the CLEC under above-mentioned source IP address and the end user as the instance identification of the many instances of NAT the civilian source IP address of IP datagram that the end user sends to be carried out the many instance processes of NAT again; And many instance processes of record NAT information, the IP address after CLEC information under this many instance processes of NAT information such as above-mentioned source IP address, the end user and the conversion etc.; Present embodiment does not limit the information that many instance processes of NAT information specifically comprises.In carrying out the many instance processes of above-mentioned NAT, when the end user's of different CLEC source IP address is identical, can be identical through the IP address after the conversion corresponding after the many instance processes of above-mentioned NAT.When if the end user's of different CLEC source IP address is identical, be different through the IP address after the conversion corresponding after the many instance processes of above-mentioned NAT, can not write down the affiliated CLEC information of above-mentioned end user in then above-mentioned many instance processes of NAT information.The purpose IP address that the IP datagram that the BRAS of ILEC sends according to CDN ES is civilian and many instance processes of NAT information of above-mentioned record are carried out the many instance processes of NAT (the backhaul conversion process that also can be called the many instances of NAT); The IP datagram literary composition that CDN ES is sent converts the back message using that is transmitted to the end user into, and transmits this back message using to the end user.Present embodiment does not limit the concrete implementation procedure of the many instance processes of NAT.
Embodiment three, content access device.This content access device can be arranged among the LAC, and for example, this content access device is arranged among the BRAS, and this BRAS is the BRAS of ILEC.The structure of this content access device is shown in accompanying drawing 4.
Content access device among Fig. 4 comprises: monitor module 400, receiver module 410 and control module 420.
Monitor module 400, be used for the message of monitoring users, obtain and store the corresponding relation between user's IP address and the PPP session information.
Monitor the message of module 400 monitoring users, an object lesson that obtains and store the corresponding relation between user's IP address and the PPP session information comprises: monitor module 400 and obtain and store the corresponding relation between user's IP address and the PPP session information through the ppp negotiation process between monitoring users and the network side.Above-mentioned ppp negotiation process of being monitored such as the ipcp negotiation in the ppp negotiation process.Message in the above-mentioned ppp negotiation process of being monitored can comprise: the message that message that the user sends and/or LAC send to the user.Another object lesson comprises: monitor module 400 and obtain and store the corresponding relation between user's IP address and the PPP session information through the IP message that monitoring users sends.The above-mentioned IP message is the IP message that the user sends in ppp negotiation success back.Monitoring module 400 also can be through obtaining the corresponding relation between user's IP address and the PPP session information to other monitoring by the eavesdropping target, and present embodiment not limiting monitoring module 400 obtains the concrete implementation procedure of the corresponding relation between user's IP address and the PPP session information through monitoring.
400 monitorings of monitoring module are obtained and stored relation can comprise: user's IP address and PPP connection identifier.The corresponding relation that monitoring module 400 is obtained monitoring is stored in this module, also can this corresponding relation be stored in to be independent of in other module of monitoring module 400.Present embodiment does not limit the memory location and the storage mode of corresponding relation.
Receiver module 410 is used to receive the access to content request that the user sends, and the content response message that sends of the Edge Server of received content distributing network.The content that comprises in the content response message here content that to be Edge Server provide for the user according to the access to content request that receives, the i.e. content of the access to content request correspondence that receives of receiver module 410.
Control module 420 is used for sending this access to content request to the Edge Server of content distributing network, and transmits foregoing according to above-mentioned corresponding relation to the user.It is that the corresponding relation that control module 420 listens to according to monitoring module 400 is determined the corresponding PPP session information of this content that control module 420 is transmitted foregoing according to above-mentioned corresponding relation to the user; And utilize the PPP session information that content is encapsulated; Afterwards, the content of control module 420 after the user transmits encapsulation.
Receiver module 410 may receive the multiple request that comprises the access to content request that the user sends, and the information of carrying in the request that control module 420 can receive according to receiver module 410 judges whether the request that receiver module 410 receives is the access to content request.Control module 420 judges that whether the request that receives is that an object lesson of access to content request comprises: when the purpose IP address that control module 420 is carried in judging request belongs to the address realm of content preset server; Judging the request that receives is the access to content request; Otherwise it is non-access to content request that control module 420 is judged the request that receives.
When control module 420 is judged request that receiver module 410 receives and is not the access to content request; Content access device can adopt existing mode that this request is handled; For example; When control module 420 was judged request that receiver module 410 receives for the request of other website the content of visit in content distributing network, control module 420 was carried out information interaction according to L2TP flow process and LNS, made the user can above-mentioned other website of successful access.Present embodiment not the limitting contents access device to the concrete processing procedure of non-access to content request.
An object lesson of the structure of above-mentioned control module 420 is shown in accompanying drawing 4A.
Control module 420 among Fig. 4 A comprises: judge submodule 421 and control submodule 422.
Judge submodule 421, be used for judging the content that access to content request that whether Edge Server of content distributing network can provide receiver module 410 to receive is asked according to the content distributing network access strategy.
Control submodule 422; Be used for after judging that submodule 421 is judged the Edge Server of content distributing network and can the content of being asked be provided; The access to content request that receives to the Edge Server sending/receiving module 410 of content distributing network, and transmit the content response message that receiver module 410 receives to the user according to the corresponding relation that above-mentioned monitoring gets access to.Judge the Edge Server of content distributing network the content of being asked can not be provided if judge submodule 421, then control submodule 422 and do not send this access to content request to the Edge Server of content distributing network.Can not provide under the situation of the content of being asked at the Edge Server of judging content distributing network, control submodule 422 can adopt existing method to send this access to content request, like control submodule 422 the access to content request is sent to LNS etc.
The judgement submodule 421 of present embodiment is carried out the particular content that the content distributing network access strategy of decision operation institute foundations stores in can the Edge Server according to content distributing network and is provided with, and also can whether can get access to content corresponding setting from the central server of content distributing network according to the Edge Server of content distributing network.
Judge that the object lesson that submodule 421 is carried out decision operation comprises: judge that submodule 421 obtains the purpose IP address of access to content request; Judge that submodule 421 judges whether this purpose IP address belongs in advance the IP address set that is provided with; If belong to, judge that then submodule 421 judges the Edge Server of content distributing network the access to content content that request is asked can be provided; If do not belong to, judge that then submodule 421 judges the Edge Server of content distributing network the access to content content that request is asked can not be provided.
Judge that another object lesson that submodule 421 is carried out decision operation comprises: the index of judging the content that submodule 421 definite access to content requests are asked; Judgement submodule 421 can be confirmed this index according to the IP five-tuple of access to content request, and judgement submodule 421 also can be confirmed this index according to application layer content (like filename); Judge that submodule 421 judges whether this index belongs in advance the content indexing table of the content server of storage; If belong to; Judge that then submodule 421 judges the Edge Server of content distributing network the access to content content that request is asked can be provided; If do not belong to, judge that then submodule 421 judges the Edge Server of content distributing network the access to content content that request is asked can not be provided.
An object lesson of the structure of above-mentioned control submodule 422 is shown in accompanying drawing 4B.
Control submodule 422 among Fig. 4 B comprises: be redirected submodule 4221 and encapsulation submodule 4222.Optional, control submodule 422 also comprises: NAT submodule 4223.
Be redirected submodule 4221, be used for after judging that submodule 421 is judged the Edge Server of content distributing network and can the content of being asked be provided, the access to content request that receiver module 410 is received is redirected to Edge Server.
The object lesson that the access to content request that redirected submodule 4221 receives receiver module 410 is redirected to Edge Server comprises: be redirected the PPP encapsulation that submodule 4221 divests the access to content request, and send the IP message after divesting the PPP encapsulation to the Edge Server of content distributing network.
Encapsulation submodule 4222; Be used for after receiver module 410 receives the content response message that Edge Server sends; In the above-mentioned corresponding relation that listens to, search record with the purpose IP matching addresses of this content response message; According to this content response message of the encapsulation of the PPP session information in the record of the coupling that finds, and the content response message after the user transmits encapsulation.
In control submodule 422, comprise under the situation of NAT submodule 4223; NAT submodule 4223; Be used for the source IP address of content access request is carried out the many instance processes of NAT, and the many instance processes of NAT are carried out in the purpose IP address of the content response message that sends of the Edge Server that receiver module 410 is received.
If NAT submodule 4223 has been carried out the many instance processes of NAT, then be redirected the Edge Server that submodule 4221 need be redirected to the access to content request content distributing network according to the source IP address after the many instance processes of NAT; And, encapsulation submodule 4222 in searching the recording process of coupling, should in above-mentioned corresponding relation, search with the many instance processes of NAT after the record of purpose IP matching addresses.
Can know from above-mentioned description to embodiment three; The corresponding relation between user's IP address and the PPP session information can obtained and store to monitoring module 400 among the embodiment three through the message of monitoring users; Utilize this corresponding relation control module 420 can control the user obtains access to content request correspondence from the Edge Server of content distributing network content; That is to say; The content access device of present embodiment has been carried out Bypass Control to user's access to content process, and promptly user's access to content process can arrive the Edge Server of content distributing network again without LNS, but from content access device directly to the Edge Server of content distributing network; Can avoid the information interaction between the wholesale provider in broadband such as ILEC and broadband retailer such as the CLEC through content access device to the Bypass Control of user's access to content; Thereby not only can avoid the shared transfer resource of information interaction between ILEC and the CLEC based on Layer 2 Tunneling Protocol; Can also avoid the shared access to content time of information interaction; Finally improve access to content efficient, practiced thrift the shared Internet resources of access to content.
Embodiment four, content access system.This system is shown in accompanying drawing 5.
Content access system among Fig. 5 comprises: the Edge Server 510 of LAC500 and content distributing network.LAC500 can be the BRAS of ILEC.Though only show a LAC500 and an Edge Server 510 among Fig. 5, in the network of reality, content access system can comprise a plurality of LAC500 and/or a plurality of Edge Server 510.
LAC500; The message that is used for monitoring users; Obtain and store the corresponding relation between user's IP address and the PPP session information, receive the access to content request that the user sends, send this access to content request to Edge Server 510; After receiving the content response message that Edge Server 510 sends, transmit this content response message to the user according to above-mentioned corresponding relation.It is the corresponding PPP session information in purpose IP address that LAC500 confirms the content response message that LAC500 transmits this content response message according to above-mentioned corresponding relation to the user; The PPP session information that utilization is determined encapsulates the content response message, and the content response message after the user sends encapsulation.
LAC500 can obtain and store the corresponding relation between user's IP address and the PPP session information through the message in the ppp negotiation process between monitoring users and the network side (like the ipcp negotiation in the ppp negotiation process).Message in the above-mentioned ppp negotiation process of being monitored can comprise: the message that message that the user sends and/or LAC send to the user.LAC500 also can obtain and store the corresponding relation between user's IP address and the PPP session information through the IP message that monitoring users sends.Present embodiment does not limit LAC500 obtains the corresponding relation between user's IP address and the PPP session information through monitoring concrete implementation procedure.
LAC500 may receive the multiple request that the user sends, and LAC500 can judge whether the request that receives is the access to content request according to the information of carrying in the request.LAC500 judges whether the request that receives is the description of the object lesson such as the above-mentioned embodiment of access to content request, in this no longer repeat specification.When LAC500 judged the request that receives and is not the access to content request, LAC500 can adopt existing mode that this request is handled.Present embodiment does not limit the concrete processing procedure of LAC500 to non-access to content request.
Optional; LAC500 is before sending the access to content request to Edge Server 510; Can carry out the judgement whether Edge Server 510 can provide the access to content content that request is asked, for example, LAC500 judges according to content preset distributing network access strategy whether Edge Server 510 can provide the access to content content that request is asked; The content of being asked can be provided judging Edge Server 510; LAC500 sends these access to content requests to Edge Server 510, the content of being asked can not be provided judging Edge Server 510, and LAC500 does not send these access to content requests to Edge Server 510.Can not provide under the situation of the content of being asked judging Edge Server 510, LAC500 can adopt existing method to send this access to content request, like LAC500 the access to content request is sent to LNS etc.
Content distributing network access strategy in the present embodiment can be provided with according to the particular content of storage in the Edge Server 510, also can whether can get access to content corresponding setting from the central server of content distributing network according to Edge Server 510.Description among the object lesson of content distributing network access strategy such as the above-mentioned embodiment is in this no longer repeat specification.
LAC500 can adopt the mode of being redirected to send the access to content request to Edge Server 510, and for example, LAC500 divests the PPP encapsulation of access to content request, and sends the IP message after divesting the PPP encapsulation to Edge Server 510.
Do not exist in user's IP address under the situation of overlapping phenomenon, do not exist under the identical situation like the user's IP address among any two CLEC, LAC500 can directly be redirected to Edge Server 510 with the access to content request.And may exist under the situation of overlapping phenomenon in user's IP address; Possibly exist under the identical situation like the user's IP address among a plurality of CLEC; LAC500 can be earlier carries out the many instance processes of NAT to the source IP address of content access request; Afterwards, LAC500 is redirected to Edge Server 510 according to the source IP address after the many instance processes of NAT with the access to content request again.LAC500 carries out the detailed process of the many instance processes of NAT such as the description of above-mentioned embodiment, in this no longer repeat specification.
Edge Server 510 is used to receive the access to content request that LAC500 sends, and sends the content response message according to the access to content request that receives to LAC500.The content that comprises in this content response message is the content that the access to content request is asked.
Edge Server 510 can comprise the content that Edge Server 510 is stored in advance to the content response message that LAC500 sends; Also can comprise Edge Server 510 after receiving the access to content request that LAC500 sends, the content of obtaining from the central server of content distributing network according to this access to content request.To be Edge Server 510 receiving the content that has just stored before the access to content request that LAC500 sends to the above-mentioned content of storage in advance.Need to prove; Server 510 receives the access to content request and can not provide under the situation of the access to content content that request is asked on the edge of, and Edge Server 510 can make user's other server from content distributing network obtain the content of being asked through being redirected.
The concrete structure of LAC500 can be like the description among the above-mentioned embodiment three, in this no longer repeat specification.
Can know from above-mentioned description to embodiment four; LAC500 among the embodiment four can obtain and store the corresponding relation between user's IP address and the PPP session information through the message of monitoring users; Utilize this corresponding relation LAC500 can control the user obtains access to content request correspondence from the Edge Server 510 of content distributing network content; That is to say; LAC500 has carried out Bypass Control to user's access to content process, and promptly user's access to content process can arrive the Edge Server 510 of content distributing network again without LNS, but from LAC500 directly to the Edge Server 510 of content distributing network; Can avoid the information interaction between the wholesale provider in broadband such as ILEC and broadband retailer such as the CLEC through LAC500 to the Bypass Control of user's access to content; Thereby not only can avoid the shared transfer resource of information interaction between ILEC and the CLEC based on Layer 2 Tunneling Protocol; Can also avoid the shared access to content time of information interaction; Finally improve access to content efficient, practiced thrift the shared Internet resources of access to content.
Description through above execution mode; Those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform; Can certainly all implement, but the former is better execution mode under a lot of situation through hardware.Based on such understanding, all or part of can the coming out that technical scheme of the present invention contributes to background technology with the embodied of software product, described software product can be used to carry out above-mentioned method flow.This computer software product can be stored in the storage medium; Like ROM/RAM, magnetic disc, CD etc.; Comprise that some instructions are with so that a computer equipment (can be a personal computer; Server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Though described the present invention through embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (7)
1. an access to content method is characterized in that, comprising:
The message of monitoring users obtains and stores the corresponding relation between said user's IP address and the point-to-point protocol PPP session information;
Receive the access to content request that said user sends;
After the Edge Server of determining content distributing network according to the content distributing network access strategy can provide the content of described request, send said access to content request to the Edge Server of content distributing network;
Said Edge Server to content distributing network sends said access to content request; And to transmit said Edge Server according to said corresponding relation to said user be that the content that said user provides comprises according to said access to content request: said access to content request is redirected to said Edge Server; And receiving the content response message that said Edge Server sends according to said access to content request, said content response message comprises the content that said access to content request is asked; Confirm in the said corresponding relation and the record of the purpose IP matching addresses of said content response message, encapsulate said content according to the PPP session information in the record of said coupling, and the content after said user sends said encapsulation.
2. the method for claim 1 is characterized in that, the message of said monitoring users, and the corresponding relation that obtains and store between user's IP address and the PPP session information comprises:
Monitor said user's ppp negotiation message, obtain and store the corresponding relation between said user's IP address and the PPP session information; Perhaps
Monitor the IP message that said user sends, obtain and store the corresponding relation between said user's IP address and the PPP session information.
3. the method for claim 1 is characterized in that:
Saidly said access to content request is redirected to said Edge Server comprises: described request is redirected to said Edge Server; And saidly confirm in the said corresponding relation to comprise: after receiving the content response message that said Edge Server sends, confirm in the said corresponding relation record with the purpose IP matching addresses of said content response message with the record of the purpose IP matching addresses of said content response message; Perhaps
Saidly said access to content request is redirected to said Edge Server comprises: the source IP address to described request carries out the many instance processes of network address translation NAT; And described request is redirected to said Edge Server according to the source IP address after the many instance processes of said NAT; And saidly confirm in the said corresponding relation to comprise: after receiving the content response message that said Edge Server sends with the record of the purpose IP matching addresses of said content response message; The many instance processes of NAT are carried out in the purpose IP address of said content response message; Afterwards, confirm in the said corresponding relation with the many instance processes of said NAT after the record of purpose IP matching addresses.
4. like the described method of arbitrary claim in the claim 1 to 2; It is characterized in that; Said Edge Server is that the content that said user provides comprises according to described request: the content of the Edge Server of said content distributing network storage before receiving described request; And/or the Edge Server of said content distributing network is after receiving described request, the content of obtaining from the central server of said content distributing network according to described request.
5. a content access device is characterized in that, said device comprises:
Monitor module, be used for the message of monitoring users, obtain and store the corresponding relation between said user's IP address and the PPP session information;
Receiver module is used to receive the access to content request that said user sends, and the Edge Server of received content distributing network sends is the content that said user provides according to said access to content request;
Control module is used for sending said access to content request to the Edge Server of content distributing network, and transmits the content that said receiver module receives according to said corresponding relation to said user;
Said control module comprises judges submodule and control submodule:
Said judgement submodule is used for judging according to the content distributing network access strategy whether the Edge Server of content distributing network can provide the content of described request;
Said control submodule; Be used for after judging that submodule is judged the Edge Server of said content distributing network the content of described request can be provided; Edge Server to content distributing network sends said access to content request, and transmits said content according to said corresponding relation to said user;
Said control submodule comprises redirected submodule and encapsulation submodule:
Said redirected submodule is used for after judging that submodule is judged the Edge Server of said content distributing network the content of described request can be provided, said access to content request being redirected to said Edge Server;
Said encapsulation submodule; Be used for after receiver module receives the content response message that said Edge Server sends; In said corresponding relation, search record with the purpose IP matching addresses of said content response message; PPP session information according in the record of said coupling encapsulates said content, and the content after said user transmits said encapsulation.
6. device as claimed in claim 5 is characterized in that, said control submodule also comprises:
The NAT submodule is used for the source IP address of described request is carried out the many instance processes of network address translation NAT, and the many instance processes of NAT are carried out in the purpose IP address of the content response message that said Edge Server is sent;
The source IP address of said redirected submodule after according to the many instance processes of said NAT is redirected to said Edge Server with described request;
Said encapsulation submodule confirm in the said corresponding relation with the many instance processes of said NAT after the record of purpose IP matching addresses.
7. a content access system is characterized in that, comprising:
L2TP Access Concentrator LAC; The message that is used for monitoring users; Obtain and store the corresponding relation between said user's IP address and the PPP session information; Receive the access to content request that said user sends, judge according to content preset distributing network access strategy whether the Edge Server of content distributing network can provide the access to content content that request is asked, the content of being asked can be provided at the Edge Server of judging content distributing network; Adopt the mode of being redirected to send said access to content request to the Edge Server of content distributing network; After receiving the content response message that said Edge Server sends, in the user's IP address of storage and the corresponding relation between the PPP session information, search the record with the purpose IP matching addresses of content response message, and the content that encapsulation receives according to the PPP session information in the matched record; Afterwards, the content after the user transmits encapsulation;
The Edge Server of content distributing network is used to receive the access to content request that said LAC sends, and sends the content response message according to said access to content request to said LAC, and this content response message comprises the content that the access to content request is asked.
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| CN101917742B (en) * | 2010-08-13 | 2013-01-23 | 华为技术有限公司 | Data transmission method, equipment and system |
| CN102387168B (en) * | 2010-08-30 | 2016-07-06 | 中兴通讯股份有限公司 | A kind of contents access method and access to content node |
| CN103516607B (en) * | 2012-06-25 | 2017-05-03 | 中兴通讯股份有限公司 | CDN multi-path routing method and system |
| CN103516606B (en) * | 2012-06-25 | 2017-08-11 | 中兴通讯股份有限公司 | A kind of CDN route implementation methods and system |
| CN103841627B (en) * | 2012-11-22 | 2017-12-12 | 中国电信股份有限公司 | The method and system of Operator Specific Service is used by Virtual Private Dialup Network |
| CN103001967B (en) * | 2012-12-13 | 2016-12-21 | 北京奇虎科技有限公司 | Source station server and service push method |
| CN103873444B (en) * | 2012-12-14 | 2017-12-19 | 中国电信股份有限公司 | Method, the business switching device of outer network service are accessed when mobile terminal VPDN is online |
| CN103312716B (en) * | 2013-06-20 | 2016-08-10 | 北京蓝汛通信技术有限责任公司 | A kind of method and system accessing internet information |
| CN103747116A (en) * | 2014-01-24 | 2014-04-23 | 杭州华三通信技术有限公司 | Business access method and device based on Layer 2 Tunneling Protocol (L2TP) |
| CN106453123A (en) * | 2016-09-30 | 2017-02-22 | 广州视睿电子科技有限公司 | Cross-region business processing method and apparatus |
| CN109688054B (en) * | 2017-10-18 | 2022-02-15 | 中国电信股份有限公司 | VPDN user internet surfing method and PGW |
| CN111385338B (en) * | 2018-12-29 | 2023-02-07 | 中兴通讯股份有限公司 | Method and device for realizing optical line terminal-content distribution network, medium and network |
| CN110426134A (en) * | 2019-09-05 | 2019-11-08 | 肇庆市智引信息科技有限公司 | A kind of temperature real-time acquisition device |
| CN111935330B (en) * | 2020-07-20 | 2022-04-29 | 烽火通信科技股份有限公司 | Method and device for PPP message to pass through L2TP |
| CN113132394B (en) * | 2021-04-22 | 2023-02-03 | 中国建设银行股份有限公司 | Request processing system, method and device, storage medium and electronic equipment |
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