CN107222856B - Method and device for realizing roaming between wireless controllers (AC) - Google Patents
Method and device for realizing roaming between wireless controllers (AC) Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
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Abstract
The embodiment of the invention provides a method for realizing roaming among wireless controllers (AC), which is applied to a first wireless local area network access device and comprises the following steps: detecting a trigger condition, and determining whether a safety table entry corresponding to the associated terminal STA exists in a preset time period or not when the trigger condition is detected; when no security entry exists, an IP address lease renewal request is sent to a DHCP server according to the MAC address of the associated STA, so that the DHCP server establishes a new lease for the IP address of the associated STA; and establishing a safety table entry corresponding to the associated STA according to the feedback of the IP address renewal request by the DHCP server. Meanwhile, the embodiment of the invention also provides a device for realizing roaming among the wireless controllers AC, and the embodiment of the invention has the advantages that: the problem that the access equipment cannot surf the internet due to the fact that the access equipment does not have the terminal STA safety table entry is solved, and the terminal can surf the internet normally when roaming and migrating between the ACs.
Description
Technical Field
The invention relates to the field of data communication, in particular to a method and a device for realizing roaming among wireless controllers (AC).
Background
The ROAM (roaming) is a function provided for meeting the requirement that a wireless user has a reassociation behavior when moving in the coverage areas of different APs (Access points), and the roaming function enables the wireless user, namely an STA (Station), to continuously maintain the original IP communication and continue to enjoy all application services in the moving process.
The DHCP Snooping means DHCP Snooping, and records and monitors the use condition of the user IP address by Snooping a DHCP (dynamic host Configuration Protocol) interaction message between a DHCP Client and a server, and a user data entry generated by the DHCP Snooping record can provide services for security applications such as IP SourceGuard, ARP (address resolution Protocol) Check, and the like.
The ARP message checking (ARP-Check) function filters all ARP messages under the port (including a 2-layer exchange port of wired access, a 2-layer AP port or a 2-layer packaging sub-interface and a WLAN of wireless access), discards all illegal ARP messages, can effectively prevent ARP deception in the network, improves the stability of the network, and is one of security table entry sources of legal users.
The IP Source Guard function is used for carrying out Source address check on a message passing through a port, wherein the port can be a wired access switching port, a layer 2 AP port or a layer 2 packaging sub-interface, and can also be a wireless access WLAN. Only messages whose source address field matches the set of bound user records generated by DHCPSnooping, or matches the set of users statically configured by the administrator, can pass through the port.
Most wireless users STA can renew lease original IP address after roaming, the renewal triggers DHCPclient and DHCP Server to carry out DHCP message exchange, the wireless access equipment generates corresponding DHCP Snooping safety table items through the process, and the STA can surf the internet normally after roaming.
If the wireless user STA does not reapply for the IP address after roaming, the access device cannot generate the DHCPsnooping table entry, namely the access device does not have the security table entry of the STA, and the STA cannot surf the internet after roaming.
In prior art application scenarios, the AC1 and AC2 have no way to establish roaming (e.g., across vendors, across versions, or simply no roaming groups configured), and the presence of DHCP Snooping entries on both ACs is dependent on the DHCP acquisition process of the STA. From the STA's perspective, roaming may simply be sending a re-association frame to the new AC, and thus does not necessarily send a DHCP message to re-apply for an address. In the following scenario, when the STA roams, the STA cannot surf the internet because the STA does not acquire the IP again. In this scenario, the AP1 is managed by the AC1, the AP2 is managed by the AC2, and the two sets of wireless access control systems deploy the same SSID (Service SetIdentifier), which is specifically as follows:
in a first scenario, the STA associates with the AP1 to initiate a DHCP request, and this process generates a DHCP Snooping on the AC1 (if the local forwarding is performed, the DHCP Snooping is generated on the AP 1), and the STA normally surfs the internet, and at this time, the AC2 (if the local forwarding is performed, the AP2) is a DHCP Snooping entry without the STA; the STA then roams onto AP2 without initiating a DHCP request. In this case, the STA uses the old address for communication, and if the access device AP2 configures security policies such as address privacy protection, and there is no DHCPSnooping entry on the AC2, the STA cannot communicate.
Scenario two, STA initiates a DHCP request at AC1 (and generates Snooping entries), then roams to AC2, renews the lease on AC2, and then returns to AC 1. In this case, the leases of the STA and the DHCP Server are updated, but the DHCP Snooping entry lease of the AC1 is not updated, and if the STA does not renew the lease before the DHCP Snooping entry of the AC1 ages (because the STA considers that its lease is long), the STA cannot surf the internet after the DHCP Snooping entry of the AC1 ages.
It can be seen from the first and second scenes that roaming is performed between different ACs, and if no STA security entry exists, the STA cannot surf the internet after roaming.
In order to solve the above problems, the following technical solutions exist at present:
the first scheme is as follows:
and carrying out safety table item backup on the access equipment AP or the AC.
Scheme II:
and (4) kicking the STA after roaming to actively cause STA roaming failure, and allowing the STA to re-associate and perform wireless authentication before surfing the Internet.
And (3) analyzing a scheme:
the first scheme is as follows: at present, standard specification safety list item backup is not available, if the scheme is adopted, only equipment of a single equipment manufacturer is limited, a private protocol is used for backup, namely, the problem of cross-manufacturer wireless equipment roaming migration cannot be solved unless the cross-manufacturer has a standard backup protocol.
Scheme II: the purpose of roaming is to improve the wireless use experience of the user, and by adopting the scheme II, the user experience in the roaming process is very poor.
Disclosure of Invention
In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:
a method for realizing roaming between wireless controllers (AC) is applied to a first wireless local area network access device and comprises the following steps:
the detection of a trigger condition is carried out,
when the trigger condition is detected, determining whether a safety table entry corresponding to the associated terminal STA exists in a preset time period;
when no security entry exists, an IP address lease renewal request is sent to a DHCP server according to the MAC address of the associated STA, so that the DHCP server establishes a new lease for the IP address of the associated STA;
and establishing a safety table entry corresponding to the associated STA according to the feedback of the IP address renewal request by the DHCP server.
Optionally, the triggering condition includes:
and the STA is associated to the first access device, wherein the STA is the STA which roams to the first access device and the first AC corresponding to the first access device after the second access device and the second AC corresponding to the second access device are associated and acquire the IP address.
Optionally, the triggering condition includes:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
Optionally, the method further includes: and receiving an IP address lease renewal request initiated by the associated STA, and forwarding the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
Optionally, the step of receiving the IP address lease renewal request initiated by the associated STA specifically includes: and receiving an IP address lease renewal request initiated by the associated STA when the lease of the IP address on the associated STA reaches a set threshold.
Another aspect of the embodiments of the present invention is to provide an apparatus for implementing roaming between wireless controllers AC, including:
a detection module for detecting a trigger condition,
a safety entry confirmation module, configured to determine whether a safety entry corresponding to the associated terminal STA exists within a preset time period when the trigger condition is detected;
the address request module is used for initiating an IP address lease renewal request to a DHCP server according to the MAC address of the associated STA when no security entry exists, so that the DHCP server can establish a new lease for the IP address of the associated STA;
and the safety table item establishing module is used for establishing a safety table item corresponding to the associated STA according to the feedback of the IP address renewal request by the DHCP server.
Optionally, the triggering condition includes:
and the STA is associated to the first access device, wherein the STA is the STA which roams to the first access device and the first AC corresponding to the first access device after the second access device and the second AC corresponding to the second access device are associated and acquire the IP address.
Optionally, the triggering condition includes:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
Optionally, the apparatus further comprises:
and the lease renewal request processing module is used for receiving the IP address lease renewal request initiated by the associated STA and forwarding the IP address lease renewal request initiated by the associated STA to the DHCP server so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
Optionally, the lease renewal request processing module is specifically configured to receive an IP address lease renewal request initiated by the associated STA when the lease of the IP address on the associated STA reaches a set threshold, and forward the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA updates the lease of the IP address on the associated STA according to a new lease of the IP address of the associated STA on the DHCP server.
The embodiment of the invention has the beneficial effects that: the problem that in the prior art, access equipment does not have a terminal STA security table entry, so that the terminal cannot surf the internet is solved, when the terminal roams and migrates between ACs, the terminal can surf the internet normally, and roaming experience is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method according to an embodiment of the present invention;
FIG. 3 is a diagram of an apparatus according to an embodiment of the present invention;
fig. 4 is a diagram illustrating an apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A first embodiment of the present invention provides a method for implementing roaming between wireless controllers AC, which is applied to a first wireless local area network access device, as shown in fig. 1, and includes:
s101, detecting a triggering condition,
s103, when the trigger condition is detected, determining whether a safety table entry corresponding to the associated terminal STA exists in a preset time period;
s105, when no security entry exists, an IP address renewal request is sent to a DHCP server according to the MAC address of the associated STA, so that the DHCP server establishes a new lease for the IP address of the associated STA;
and S107, establishing a safety table entry corresponding to the associated STA according to the feedback of the IP address renewal request by the DHCP server.
The embodiment of the invention has the beneficial effects that: the problem that in the prior art, access equipment does not have a terminal STA security table entry, so that the terminal cannot surf the internet is solved, when the terminal roams and migrates between ACs, the terminal can surf the internet normally, and roaming experience is improved.
Optionally, based on the first embodiment of the present invention, in the second embodiment of the present invention, the triggering condition includes:
and the STA is associated to the first access device, wherein the STA is the STA which roams to the first access device and the first AC corresponding to the first access device after the second access device and the second AC corresponding to the second access device are associated and acquire the IP address.
Optionally, based on the first embodiment of the present invention, in a third embodiment of the present invention, the triggering condition includes:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
When the lease of the IP address expires, the security table entry corresponding to the STA will age naturally.
Optionally, based on the first embodiment of the present invention, in a fourth embodiment of the present invention, as shown in fig. 2, the method further includes:
s109, receiving the IP address lease renewal request initiated by the associated STA, and forwarding the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
Optionally, based on the fourth embodiment of the present invention, in a fifth embodiment of the present invention, the step S109 specifically includes: and receiving an IP address lease renewal request initiated by the associated STA when the lease of the IP address on the associated STA reaches a set threshold value, so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
Because the IP address allocated by the STA leasing DHCP Server is unchanged, the DHCPsnooping on the access device AP acquires the IP flow by sniffing the DHCP, learns the security entry, and the access device AP replaces the STA to initiate the process of acquiring the IP address by the DHCP and is transparent to the DHCP Snooping. At this time, the leases of the DHCP Server and Snooping are refreshed, the lease of the STA is still maintained, the STA communicates normally, and then when the STA reaches the 1/2 lease or 7/8 lease, the STA initiates a lease renewal, which refreshes the leases of the DHCP Server, the DHCP Snooping and the STA to be the same.
A sixth embodiment of the present invention provides an apparatus for implementing roaming between wireless controllers AC, as shown in fig. 3, including:
a detection module 201 for detecting a trigger condition,
a safety entry confirmation module 203, configured to determine whether a safety entry corresponding to the associated terminal STA exists within a preset time period when the trigger condition is detected;
an address request module 205, configured to initiate an IP address lease renewal request to a DHCP server according to the MAC address of the associated STA when there is no security entry, so that the DHCP server establishes a new lease for the IP address of the associated STA;
a security entry establishing module 207, configured to establish, according to the feedback of the IP address renewal request, a security entry corresponding to the associated STA.
The embodiment of the invention has the beneficial effects that: the problem that in the prior art, access equipment does not have a terminal STA security table entry, so that the terminal cannot surf the internet is solved, when the terminal roams and migrates between ACs, the terminal can surf the internet normally, and roaming experience is improved.
Optionally, based on the sixth embodiment of the present invention, in a seventh embodiment of the present invention, the triggering condition includes:
and the STA is associated to the first access device, wherein the STA is the STA which roams to the first access device and the first AC corresponding to the first access device after the second access device and the second AC corresponding to the second access device are associated and acquire the IP address.
Optionally, based on the sixth embodiment of the present invention, in an eighth embodiment of the present invention, the triggering condition includes:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
Optionally, based on the sixth embodiment of the present invention, in a ninth embodiment of the present invention, as shown in fig. 4, the apparatus further includes:
a lease renewal request processing module 209, configured to receive the IP address lease renewal request initiated by the associated STA, and forward the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA updates the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
Optionally, based on the ninth embodiment of the present invention, in the tenth embodiment of the present invention, the lease renewal request processing module 209 is specifically configured to receive an IP address lease renewal request initiated by the associated STA when a lease of an IP address on the associated STA reaches a set threshold, and forward the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA updates a lease of the IP address on the associated STA according to a new lease of the IP address of the associated STA on the DHCP server.
Because the IP address allocated by the STA leasing DHCP Server is unchanged, the DHCPsnooping on the access device AP acquires the IP flow by sniffing the DHCP, learns the security entry, and the access device AP replaces the STA to initiate the process of acquiring the IP address by the DHCP and is transparent to the DHCP Snooping. At this time, the leases of the DHCP Server and Snooping are refreshed, the lease of the STA is still maintained, the STA communicates normally, and then when the STA reaches the 1/2 lease or 7/8 lease, the STA initiates a lease renewal, which refreshes the leases of the DHCP Server, the DHCP Snooping and the STA to be the same.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for implementing roaming between wireless controllers (AC) is applied to a first wireless local area network access device, and comprises the following steps:
the detection of a trigger condition is carried out,
when the trigger condition is detected, determining whether a safety table entry corresponding to the associated terminal STA exists in a preset time period;
when no security entry exists, an IP address lease renewal request is sent to a DHCP server according to the MAC address of the associated STA, so that the DHCP server establishes a new lease for the IP address of the associated STA;
establishing a security table entry corresponding to the associated STA according to the feedback of the IP address renewal request by the DHCP server;
wherein the trigger condition comprises:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
2. The method of claim 1, further comprising: and receiving an IP address lease renewal request initiated by the associated STA, and forwarding the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
3. The method according to claim 2, wherein the step of receiving the associated STA-initiated IP address renewal request specifically comprises: and receiving an IP address lease renewal request initiated by the associated STA when the lease of the IP address on the associated STA reaches a set threshold.
4. An apparatus for implementing roaming between wireless controllers (AC), applied to a first wireless local area network access device, includes:
a detection module for detecting a trigger condition,
a safety entry confirmation module, configured to determine whether a safety entry corresponding to the associated terminal STA exists within a preset time period when the trigger condition is detected;
the address request module is used for initiating an IP address lease renewal request to a DHCP server according to the MAC address of the associated STA when no security entry exists, so that the DHCP server can establish a new lease for the IP address of the associated STA;
a security entry establishing module, configured to establish a security entry corresponding to the associated STA according to feedback of the IP address renewal request from the DHCP server;
wherein the trigger condition comprises:
and the security table entry corresponding to the STA is aged, wherein the STA is associated with a first AC corresponding to a first access device and the first access device and acquires an IP address, roams to a second access device and a second AC corresponding to the second access device after the first access device establishes the security table entry, and roams to the first AC corresponding to the first access device and the first access device again after acquiring the IP address again.
5. The apparatus of claim 4, further comprising:
and the lease renewal request processing module is used for receiving the IP address lease renewal request initiated by the associated STA and forwarding the IP address lease renewal request initiated by the associated STA to the DHCP server so that the associated STA can update the lease of the IP address on the associated STA according to the new lease of the IP address of the associated STA on the DHCP server.
6. The apparatus of claim 5, wherein the lease renewal request processing module is specifically configured to receive an IP address lease renewal request initiated by the associated STA when a lease of an IP address on the associated STA reaches a set threshold, and forward the IP address lease renewal request initiated by the associated STA to the DHCP server, so that the associated STA updates the lease of the IP address on the associated STA according to a new lease of the IP address of the associated STA on the DHCP server.
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