CN102523583A - VPDN multi-access point backup access method and equipment - Google Patents
VPDN multi-access point backup access method and equipment Download PDFInfo
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- CN102523583A CN102523583A CN2011104032506A CN201110403250A CN102523583A CN 102523583 A CN102523583 A CN 102523583A CN 2011104032506 A CN2011104032506 A CN 2011104032506A CN 201110403250 A CN201110403250 A CN 201110403250A CN 102523583 A CN102523583 A CN 102523583A
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Abstract
The embodiment of the invention provides a virtual private dialup network (VPDN) multi-access point backup access method and equipment. The method comprises: in a VPDN networking environment, access equipment monitors a communication link that is established between the access equipment itself and an L2Tp network server (LNS); when it is determined that the communication on the communication link is abnormal, the established communication link is broken and connection between the access equipment and another LNS is established; therefore, under circumstances that an L2TP access concentrator (LAC) device does not support a mechanism for LNS link detection, a solution scheme that another LNS is accessed is provided for the access equipment, thereby improving reliability and stability of an VPDN network.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of VPDN multiple access point backup cut-in method and equipment.
Background technology
Adopting Level 2 Tunnel Protocol (L2TP; Layer 2 Tunneling Protocol) VPN (VPN; Virtual Private Network) in the network environment, offers the required equipment of VPN service seldom, only need to dispose a L2TP Network Server (LNS who supports VPN; L2TP Network Server); LNS is linked in the carrier network through the mode of special line, and long-range incoming end can be connected into L2TP Access Concentrator (LAC, L2TP Access Concentrator) the back direct calling LNS router of location operator through dial mode; Thereby realize that remote access VPN (VPDN, Virtual Private Dialup Network) inserts.(its two-forty, high security, covering characteristic wide, mobility strong have received application more and more widely for 3G, 3rd-generation) technology and professional development and along with the 3G (Third Generation) Moblie technology.The application of carrying out the VPDN access through 3G is also more and more wider, can carry out VPDN through 3G and insert the problem that solves the privately owned net of strange land visit enterprises.
Be illustrated in figure 1 as a typical network model sketch map that inserts VPDN through 3G.Incoming end realizes that the process of VPDN access is following:
The 3G router startup 3G dial-up connection of the first step, incoming end, the 3G router needs to issue access-in point information to carrier network when dialing.
LAC equipment in second step, the carrier network is received after the dial data of incoming end 3G router; Through LAC checking, authorization and accounting (AAA; Authentication, Authorization, Accounting) the server access side carries out authentication; The access-in point information concrete, that the LAC aaa server can issue according to incoming end, whether what judge that this incoming end request inserts is VPDN; Confirm that this incoming end request inserts be VPDN the time, the authentication of LAC aaa server access side is passed through.After authentication is passed through, the access-in point information that the LACAAA server issues according to incoming end, the LNS address under LAC equipment returns this incoming end, information such as tunnel attribute.
This step is the committed step that carrier network confirm to insert VPDN, its foundation that inserts VPDN be incoming end when the 3G dial-up connection, be issued to the access-in point information of carrier network through the 3G circuit.
The 3rd step, LAC equipment receive after the information of the corresponding LNS of incoming end, initiate L2TP VPN to this LNS and connect.
After L2TP Tunnel between the 4th step, LAC equipment and the LNS was set up, LNS can carry out authentication by access side 3G router once more, and authentication distributes the VPDN home address through the back to incoming end.So far just accomplished the process of incoming end access VPDN, the L2TP Tunnel between incoming end and the LNS is set up.
In network as shown in Figure 1, when LNS breaks down, user's business will be interrupted.In order to solve this type problem, raising stability of network and reliability can pass through to adopt pair mode of LNS backup, dispose two LNS routers, and one LNS is backed up in a conduct as main LNS, when a LNS breaks down, utilizes another LNS to carry out business.
In order to realize main LNS and the switching of backup between the LNS, in the existing scheme, measuring ability is provided by the LAC equipment of carrier network, detect the communication link between LAC and the current LNS.When LAC equipment confirms that this communication link breaks down, switch to the action of backup LNS by LAC.But the problem that this scheme exists is when LAC equipment is not supported measuring ability, can't solve the integrity problem of network through the mode of LNS redundancy backup.
Summary of the invention
The embodiment of the invention provides a kind of VPDN multiple access point backup cut-in method and equipment, when solution LAC equipment is not supported measuring ability, can't realize that LNS switches, and causes guaranteeing network stabilization and reliability problems.
A kind of remote access VPN VPDN multiple access point backup cut-in method, said method comprises:
Incoming end equipment issues the first information to Level 2 Tunnel Protocol LAC LAC equipment, inserts the first Level 2 Tunnel Protocol webserver LNS through this LAC equipment;
Communication link between an incoming end monitoring of equipment self and the LNS, the communication on confirming this communication link take place when unusual, break off self and are connected with Level 2 Tunnel Protocol L2TP Tunnel between the said LNS;
Incoming end equipment issues second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment;
Wherein:
The said first information comprises first user name, first authentication password, and is the VPDN domain name that a LNS distributes, and said second information comprises second user name, second authentication password, and is the 2nd VPDN domain name that the 2nd LNS distributes; Perhaps,
The said first information comprises first APN, first user name, first authentication password that a LNS is corresponding; And be the VPDN domain name that a LNS distributes; Said second information comprises second APN, second user name, second authentication password that the 2nd LNS is corresponding, and is the 2nd VPDN domain name that the 2nd LNS distributes.
A kind of remote access VPN VPDN multiple access point backup access device, said equipment comprises the first link establishment module, monitoring modular and the second link establishment module, wherein:
The first link establishment module is used for issuing the first information to Level 2 Tunnel Protocol LAC LAC equipment, inserts the first Level 2 Tunnel Protocol webserver LNS through this LAC equipment;
Monitoring modular is used to monitor the communication link between self and the LNS, and the communication on confirming this communication link takes place when unusual, breaks off self and is connected with Level 2 Tunnel Protocol L2TP Tunnel between the said LNS, and trigger the second link establishment module;
The second link establishment module is used for issuing second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment;
Wherein:
The said first information comprises first user name, first authentication password, and is the VPDN domain name that a LNS distributes, and said second information comprises second user name, second authentication password, and is the 2nd VPDN domain name that the 2nd LNS distributes; Perhaps,
The said first information comprises first APN, first user name, first authentication password that a LNS is corresponding; And be the VPDN domain name that a LNS distributes; Said second information comprises second APN, second user name, second authentication password that the 2nd LNS is corresponding, and is the 2nd VPDN domain name that the 2nd LNS distributes.
The scheme that provides according to the embodiment of the invention; In the VPDN network environment; The communication link that utilizes incoming end equipment to carry out having set up between self and the LNS is monitored, and the communication on confirming this communication link takes place to break off the communication link of having set up when unusual; And connect between another LNS; Thereby do not support to the situation of the mechanism of LNS link detecting,, to have improved the reliability and stability of VPDN network for incoming end equipment provides a kind of solution that inserts another LNS at LAC equipment.
Description of drawings
Fig. 1 passes through the network model sketch map that 3G inserts VPDN in the prior art;
The flow chart of steps of the VPDN multiple access point backup cut-in method that Fig. 2 provides for the embodiment of the invention one;
The flow chart of steps of the VPDN multiple access point backup cut-in method that Fig. 3 provides for the embodiment of the invention two;
LNS that Fig. 4 provides for the embodiment of the invention two and the communication link sketch map between the incoming end;
The 2nd LNS that Fig. 5 provides for the embodiment of the invention two and the communication link sketch map between the incoming end;
The structural representation of the VPDN multiple access point backup access device that Fig. 6 provides for the embodiment of the invention three.
Embodiment
In common VPDN network environment, in case the link fails that incoming end is held to LNS, client's business will be interrupted; Therefore in the application of reality; Generally can be equipped with a main LNS and a backup LNS, general, preferentially insert main LNS; When main LNS breaks down, can switch to backup LNS and go up.The scheme that the embodiment of the invention provides when detecting the line traffic fault, can realize inserting automatically the function of backup LNS just through detect the link of incoming end to main LNS end at incoming end at incoming end.Certainly, the scheme that the embodiment of the invention provides is equally applicable to detect incoming end to the link that backs up the LNS end at incoming end, when detecting the line traffic fault, realizes inserting automatically main LNS at incoming end.
The prerequisite that the various embodiments of the present invention scheme realizes is that at the networking initial stage, the different special line circuit of application is connected to different LNS to operator.Promptly, distribute the VPDN domain name respectively to main LNS and backup LNS.Certainly, when operator is mobile or UNICOM,, also can distribute APN (APN, Access Point Name) respectively to main LNS and backup LNS.
The present invention program is described with each embodiment through Figure of description below.Concrete, be that the incoming end router is that example describes with incoming end equipment.
Embodiment one,
The embodiment of the invention one provides a kind of VPDN multiple access point backup cut-in method, and the step of this method is as shown in Figure 2, comprising:
This step comprises: the LAC equipment of incoming end router in carrier network issues the first information, thereby inserts a LNS through this LAC equipment, sets up the communication link between an incoming end router and the LNS.When an incoming end router and a LNS set up communication link through telecom operators' network, the said first information comprised first user name, first authentication password, and was the VPDN domain name that a LNS distributes.When an incoming end router and a LNS set up communication link through mobile or UNICOM's carrier network, the said first information can further include the first corresponding APN of a LNS.
This step comprises: the communication link between incoming end router monitoring self and the LNS, the communication on definite this communication link take place when unusual, break off self and are connected with L2TP Tunnel between the said LNS.
Concrete, the incoming end router can send probe messages to a said LNS, when in setting duration, not receiving the response message that a LNS returns, confirms that the communication on this communication link takes place unusual.More excellent, the incoming end router can periodically send probe messages to a said LNS.
This step comprises: the incoming end router issues second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment, sets up the communication link between incoming end router and the 2nd LNS.When the incoming end router passed through telecom operators' network insertion the 2nd LNS, said second information comprised second user name, second authentication password, and was the 2nd VPDN domain name that the 2nd LNS distributes.When the incoming end router inserted the 2nd LNS through mobile or UNICOM's carrier network, said second information can further include the second corresponding APN of the 2nd LNS.
In embodiment one; When a LNS is the main LNS that is equipped with in the VPDN network environment; Said the 2nd LNS is the backup LNS that is equipped with in the VPDN network environment, and when a LNS was the backup LNS that is equipped with in the VPDN network environment, said the 2nd LNS was the main LNS that is equipped with in the VPDN network environment.
Owing in the common VPDN network environment, adopt the 3G link, below the scheme of the embodiment of the invention one is specified through 3G link access VPDN as access way.With the LNS among the embodiment one is main LNS, and the 2nd LNS is backup LNS, and carrier network is that mobile network or UNICOM's network are that example describes.
Embodiment two,
The embodiment of the invention two provides a kind of VPDN multiple access point backup cut-in method, and the step of this method is as shown in Figure 3, comprising:
This step comprises: incoming end router (incoming end) connects through 3G card search operator communication base station and registration.
This step comprises: the incoming end router issues the first information after succeeding in registration, and startup PPP dialing is sent connection request to carrier network.The first information comprises:
First APN (APN), first user name, first authentication password and a VPDN domain name, and concrete, first user name and a VPDN domain name can issue through following form:
Xxxyyy, wherein, xxx is first user name, yyy is a VPDN domain name.
The first information that the incoming end router that the LAC aaa server receives according to LAC equipment issues; Concrete; Can carry out authentication (when carrier network was communication network, the LAC aaa server can carry out authentication to said incoming end router according to a VPDN domain name) to said incoming end router according to first APN and a VPDN domain name, promptly the LAC aaa server determines whether to exist the relevant information of the LNS corresponding with said first APN and a VPDN domain name; If there is this relevant information; Then authentication is passed through, otherwise authentication is not passed through.When authentication is passed through, continue execution in step 204, otherwise, can process ends.
The LAC aaa server is confirmed the LNS that this incoming end router solicitation connects, and returns a LNS corresponding address, information such as tunnel attribute to said LAC equipment.
L2TP Tunnel between step 206, LNS foundation and the LAC equipment.
Hold consultation between the one LNS and the LAC equipment, and after consulting successfully, set up the L2TP Tunnel between a LNS and the LAC equipment.
In this step, a LNS can carry out authentication by the access side router, and the foundation of its authentication can be first user name and first authentication password that the incoming end router sends; Concrete, can adopt point-to-point inquiry Challenge-Handshake Authentication Protocol (CHAP, Challenge Handshake Authentication Protocol) or password authentication protocol (PAP; Password Authentication Protocol) mode is carried out authentication to said incoming end router; And issue Internet Protocol (IP, Internet Protocol) address through the back to the incoming end router, thereby realize that the incoming end router inserts a LNS in authentication; Communication link sketch map between the one LNS (main office network) and the incoming end can be as shown in Figure 4; Otherwise, obstructed out-of-date in authentication, can process ends.
The link of step 208, incoming end router monitoring incoming end to the LNS end.
Concrete; The incoming end router can regularly be initiated probe messages to a LNS; And when the destination address that detects LNS correspondence is unreachable; Think that the communication link between an incoming end and the LNS breaks down, the L2TP Tunnel of then removing incoming end to a LNS router connects, and continues execution in step 209.
Incoming end switches the operation of access point, and the information (second information) that backs up access point is issued to LAC equipment through the 3G circuit, and second information that issues comprises:
Second APN (APN), second user name, second authentication password and the 2nd VPDN domain name, certainly, second user name and the 2nd VPDN domain name also can issue through following form:
Mmmnnn, wherein, mmm is second user name, nnn is the 2nd VPDN domain name.
Because the information of access point has been accomplished switching in step 209, so incoming end initiates dialing again, second information that LAC equipment can issue according to incoming end, and the L2TP Tunnel that is established to the 2nd LNS connects.This L2TP Tunnel establishment of connection process and step 203 step 206 are similar, repeat no more at this.
In this step; The 2nd LNS router can carry out authentication by the access side router; The foundation of its authentication can be second user name and second authentication password; Authentication is incoming end router distributing IP address through back the 2nd LNS, thereby realizes that the incoming end router inserts the 2nd LNS, and the communication link sketch map between the 2nd LNS (main office network) and the incoming end can be as shown in Figure 5.
When so far just having accomplished main LNS fault, incoming end initiatively switches the process that is linked into backup LNS.
According to the embodiment of the invention one and the scheme that embodiment two provides,, a kind of method is provided at incoming end to the VPDN networking; Realize that incoming end can be under the situation of main LNS fault; Automatically insert backup LNS, perhaps, realize that incoming end can be under the situation of backup LNS fault; Automatically insert main LNS, improve the reliability and stability of VPDN network.
Concrete, can be at incoming end 3G router through the reliability of active monitoring 3G router to the network of LNS equipment room, execution takes place when unusual initiatively switch access point and move when detecting network.The new access-in point information of real time down in handoff procedure guarantees can pass through new access-in point information when incoming end is initiated connection request once more, is linked into backup LNS.
With the embodiment of the invention one and embodiment two based on same inventive concept, following equipment is provided.
Embodiment three,
The embodiment of the invention three provides a kind of VPDN multiple access point backup access device; This equipment can be as the incoming end router among the embodiment of the invention one and the embodiment two; The structure of this equipment can be as shown in Figure 6; Comprise the first link establishment module 11, monitoring modular 12 and the second link establishment module 13, wherein:
The first link establishment module 11 is used for issuing the first information to Level 2 Tunnel Protocol LAC LAC equipment, inserts the first Level 2 Tunnel Protocol webserver LNS through this LAC equipment; Monitoring modular 12 is used to monitor the communication link between self and the LNS, and the communication on confirming this communication link takes place when unusual, breaks off self and is connected with Level 2 Tunnel Protocol L2TP Tunnel between the said LNS, and trigger the second link establishment module; The second link establishment module 13 is used for issuing second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment;
Wherein:
The said first information comprises first user name, first authentication password, and is the VPDN domain name that a LNS distributes, and said second information comprises second user name, second authentication password, and is the 2nd VPDN domain name that the 2nd LNS distributes; Perhaps,
The said first information comprises first APN, first user name, first authentication password that a LNS is corresponding; And be the VPDN domain name that a LNS distributes; Said second information comprises second APN, second user name, second authentication password that the 2nd LNS is corresponding, and is the 2nd VPDN domain name that the 2nd LNS distributes.
Said monitoring modular 12 specifically is used for sending probe messages to a said LNS, when in setting duration, not receiving the response message that a LNS returns, confirms that the communication on this communication link takes place unusual.
Said monitoring modular 12 specifically is used for regularly sending probe messages to a said LNS.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. a remote access VPN VPDN multiple access point backs up cut-in method, it is characterized in that said method comprises:
Incoming end equipment issues the first information to Level 2 Tunnel Protocol LAC LAC equipment, inserts the first Level 2 Tunnel Protocol webserver LNS through this LAC equipment;
Communication link between an incoming end monitoring of equipment self and the LNS, the communication on confirming this communication link take place when unusual, break off self and are connected with Level 2 Tunnel Protocol L2TP Tunnel between the said LNS;
Incoming end equipment issues second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment;
Wherein:
The said first information comprises first user name, first authentication password, and is the VPDN domain name that a LNS distributes, and said second information comprises second user name, second authentication password, and is the 2nd VPDN domain name that the 2nd LNS distributes; Perhaps,
The said first information comprises first APN, first user name, first authentication password that a LNS is corresponding; And be the VPDN domain name that a LNS distributes; Said second information comprises second APN, second user name, second authentication password that the 2nd LNS is corresponding, and is the 2nd VPDN domain name that the 2nd LNS distributes.
2. the method for claim 1 is characterized in that, it is unusual that incoming end equipment confirms that the communication on this communication link takes place, and specifically comprises:
Incoming end equipment sends probe messages to a said LNS, when in setting duration, not receiving the response message that a LNS returns, confirms that the communication on this communication link takes place unusual.
3. method as claimed in claim 2 is characterized in that, incoming end equipment sends probe messages to a said LNS, specifically comprises:
Incoming end equipment regularly sends probe messages to a said LNS.
4. like the arbitrary described method of claim 1～3, it is characterized in that a said LNS is main LNS, said the 2nd LNS is backup LNS; Perhaps, a said LNS is backup LNS, and said the 2nd LNS is main LNS.
5. a remote access VPN VPDN multiple access point backup access device is characterized in that said equipment comprises the first link establishment module, monitoring modular and the second link establishment module, wherein:
The first link establishment module is used for issuing the first information to Level 2 Tunnel Protocol LAC LAC equipment, inserts the first Level 2 Tunnel Protocol webserver LNS through this LAC equipment;
Monitoring modular is used to monitor the communication link between self and the LNS, and the communication on confirming this communication link takes place when unusual, breaks off self and is connected with Level 2 Tunnel Protocol L2TP Tunnel between the said LNS, and trigger the second link establishment module;
The second link establishment module is used for issuing second information to said LAC equipment, inserts the 2nd LNS through said LAC equipment;
Wherein:
The said first information comprises first user name, first authentication password, and is the VPDN domain name that a LNS distributes, and said second information comprises second user name, second authentication password, and is the 2nd VPDN domain name that the 2nd LNS distributes; Perhaps,
The said first information comprises first APN, first user name, first authentication password that a LNS is corresponding; And be the VPDN domain name that a LNS distributes; Said second information comprises second APN, second user name, second authentication password that the 2nd LNS is corresponding, and is the 2nd VPDN domain name that the 2nd LNS distributes.
6. equipment as claimed in claim 5; It is characterized in that said monitoring modular specifically is used for sending probe messages to a said LNS; When in setting duration, not receiving the response message that a LNS returns, confirm that the communication on this communication link takes place unusual.
7. equipment as claimed in claim 6 is characterized in that, said monitoring modular specifically is used for regularly sending probe messages to a said LNS.
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| CN104468801A (en) * | 2014-12-11 | 2015-03-25 | 上海因联企业咨询合伙企业（普通合伙） | Free wireless value-added platform and service method thereof |
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| CN112383561A (en) * | 2020-11-30 | 2021-02-19 | 安徽信息工程学院 | Multi-access VPDN networking method |
| WO2022057758A1 (en) * | 2020-09-17 | 2022-03-24 | 中兴通讯股份有限公司 | Session resource control method and apparatus, device, system, and storage medium |
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| CN104283720A (en) * | 2014-10-29 | 2015-01-14 | 迈普通信技术股份有限公司 | Dialing method and system applied to mobile Internet and user device |
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| WO2018103665A1 (en) * | 2016-12-08 | 2018-06-14 | 华为技术有限公司 | L2tp-based device management method, apparatus and system |
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| CN108183849B (en) * | 2016-12-08 | 2021-01-08 | 上海朋熙半导体有限公司 | Device management method, device and system based on L2TP |
| WO2022057758A1 (en) * | 2020-09-17 | 2022-03-24 | 中兴通讯股份有限公司 | Session resource control method and apparatus, device, system, and storage medium |
| CN112383561A (en) * | 2020-11-30 | 2021-02-19 | 安徽信息工程学院 | Multi-access VPDN networking method |
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Application publication date: 20120627 |