Flexible, scalable, wireless data forwarding and mobility for secure wireless networks

• US 20070064673A1
• Filed: 03/10/2006
• Published: 03/22/2007
• Est. Priority Date: 03/10/2005
• Status: Abandoned Application

• Current Assignee: Bill Terrell, John Carr, Martin Mueller, Michael Cook, Michael Vakulenko, Nehru Bhandaru, Pranab Das, Tom Ermolovich
• Original Assignee: Bill Terrell, John Carr, Martin Mueller, Michael Cook, Michael Vakulenko, Nehru Bhandaru, Pranab Das, Tom Ermolovich
• Inventors: Bhandaru, Nehru, Mueller, Martin, Carr, John, Cook, Michael, Vakulenko, Michael, Terrell, Bill, Ermolovich, Tom, Das, Pranab
• Application Number:
  US11/373,863
• Publication Number:
  US 20070064673A1
• Time in Patent Office: Days
• US Class Current: 370/351
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• CPC Class Codes: H04L 63/0272 Virtual private networks
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04W 12/062 Pre-authentication
• CPC Class Codes: H04W 12/068 using credential vaults, e.g. password manager applications or one time password [OTP] applications
• CPC Class Codes: H04W 40/00 Communication routing or communication path finding
• CPC Class Codes: H04W 40/246 Connectivity information discovery

Abstract

Systems and methods are described to allow secure undisrupted communication from wireless clients that roam a wide area network. System architectures and communication protocols are provided to ensure that wireless clients can seamlessly associate and reassociate with controllers on the network, without disruption to ongoing secure communications.

Claims

1. A computer network system for forwarding packets through an integrated wired-wireless network, wherein the network supports wireless communication based on one more wireless communication protocols including 802.11, WiFi, 802.16, and WiMax, the system comprising:

one or more wireless data forwarding controllers (WDF controllers), each of which comprises one or more software modules resident upon one of a switch, router, bridge and other network device resident on the network, wherein the one or more wireless data forwarding controllers are in communication with one another via one or more protocols at layers 2 through 7;

a plurality of wireless data forwarding elements (WDF elements), each of the wireless data forwarding element comprising one or more software modules, each of the wireless data forwarding elements associated with a primary wireless data forwarding controller, the primary wireless data forwarding controller selected from the one or more wireless data forwarding controllers, wherein each of the wireless data forwarding elements is located on one of a wireless access point, a wireless Base Station, a networking switch, a router or another device in the network, wherein each wireless data forwarding element is in communication with the primary wireless data forwarding controller associated therewith via one or more protocols at layers 2 through 7.

2. The computer network system of claim 1, wherein one or more of the wireless data forwarding elements includes a wireless data forwarding agent, the wireless data forwarding agent including one or more software modules controlled by the primary wireless data forwarding controller, and a packet forwarding engine (PFE), the packet forwarding engine comprising software that accesses ports for one or more of wireless packet transmission and transmission of packets over a fixed-wire network.

3. The system of claim 1 wherein the one or more wireless data forwarding elements are in communication with the one or more wireless data forwarding controllers via one or more of a WiFi VPN protocol, CAPWAP protocol, intra-process API, Inter-Process Communication (IPC), and IWCPP.

4. The system of claim 3 where the Wi-Fi VPN, IWCPP or CAPWAP protocol provides message integrity and/or encryption of protocol messages.

5. The system of claim 3 where the wireless data forwarding Controller is pre-configured with the wireless data forwarding element for the VLAN membership for its packet forwarding engine network ports, or is otherwise operative to query the wireless data forwarding element for the VLAN membership for its packet forwarding engine network ports.

6. The system of claim 3 where the WDF Controller is either configured with or queries the WDF element for supported tunnel encapsulation types, hardware acceleration support, encryption support and WDF element or PFE capacity related to number of tunnels and wireless stations.

7. The system of claim 3 where the WDF Controller is either configured with or queries the WDF element for a suitable tunnel endpoint for a given BSS, VLAN, IP Subnet or Multicast Group.

8. The system of claim 7 where the tunnel endpoint is one of a source for the tunnel and a tunnel destination.

9. The system of claim 7 where information returned for the tunnel endpoint includes tunnel attributes, which may include one or more of tunnel encapsulation type, wherein the tunnel encapsulation type may be selected from one or more of GRE, UDP, and LWAPP, an indication of whether the tunnel is hardware accelerated, and information regarding encryption and integrity protection algorithms supported.

10. The system of claim 3 where the WDF Controller is operative to directly request a WDF element and indirectly request the associated PFE to configure a data forwarding tunnel to be used and shared for wireless data flows that belong to one or more of a Security Type, BSS, VLAN, IP Subnet, Layer 3 Protocol, Multicast Group based on tunnel endpoint information returned by the WDF element.

11. The system of claim 3 where the WDF Controller is operative to request a WDF element, and indirectly the associated PFE, to enable data flow for a wireless client using a configured tunnel.

12. The system of claim 10 where the tunnel configuration includes one or more of an indicator of whether or not cryptographic protection is enabled for data from the tunnel, wireless station, Security Type, BSS, VLAN, IP Subnet, Layer 3 Protocol, and Multicast Group using the tunnel.

13. The system of claim 3 where the WDF Controller is operative to provision a WDF element with one or more of cryptographic keys, cryptographic algorithm types for integrity and privacy protection of data to or from a tunnel, wireless station, Security Type, BSS, VLAN, IP Subnet, Layer 3 Protocol, Multicast Group.

14. The system of claim 3 where the WDF Controller is operative to provision the WDF element with quality of service parameters properties.

15. The system of claim 3 where the WDF Controller is operative to provision the WDF element with filtering rules where packets are captured and forwarded to other WCP Controller components via one or more of WiFi VPN, CAPWAP and another protocol, and where such packets may include one or more of 802.1X/EAPOL packets used for authentication and key management, 802.11i pre-authentication packets, HTTP and HTTPS packets for web-based authentication, and packets received at the WDF element that have no local forwarding state.

16. The system of claim 3 where the WDF Controller is operative to request the WDF element, and indirectly the PFE, to collect statistics for the tunnel, wireless station, Security Type, BSS, VLAN, IP Subnet, Multicast Group configured by the WDF Controller.

17. The system of claim 1 wherein the WDF controller is operative to select a wireless data forwarding mode from one of a Distributed, Centralized or Centralized-Hierarchical mode, based on the configuration of an access point, BS, BSS, ESS, SSID or VLAN in the wireless network.

18. The system of claim 1 where the WDF Controller monitors the liveness and operation of the WDF elements for which it is the primary WDF controller to ensure continuous availability of a wireless portion of the network.

19. In the computer network system of claim 1, a method of configuring the network, the method comprising:

in response to a wireless client associating to the network, invoking the WDF Controller, invoking the WDF controller including assigning one of a VLAN and an IP subnet;

selecting one or more of an A-WDF, P-WDF and an I-WDF, wherein the one or more of the A-WDF, I-WDF and P-WDF may be located on devices that are directly connected, mutually separated by a Layer 2 network, or mutually separated by a Layer 3 network.

20. The method of claim 19 where the A-WDF is located at an Access Point or a base station at which the wireless client is associating or attaching itself to the network.

21. The method of claim 19 where the P-WDF is selected from among the set of WDFs whose PFE ports are members of the VLAN assigned to the wireless station.

22. The method of claim 19 where the selection of P-WDFs is prioritized based on administratively configured priority of WDFs.

23. The method of claim 19 where the P-WDF for the current wireless client association is given a higher priority over other WDFs that could be chosen as P-WDF when the wireless client reassociates.

24. The method of claim 19 where the P-WDF located at the WDF Controller for the A-WDF is given a higher priority over other WDFs that could be chosen as P-WDF when the wireless client associates or reassociates.

25. The method of claim 19 where P-WDF is located on one of an access point or a BS when Distributed data forwarding mode is selected

26. The method of claim 19 where P-WDF is located on a switch, router, the WDF Controller or other non-AP, non-BS device in the network when Centralized or Centralized-Hierarchical data forwarding modes are selected.

27. The method of claim 26 where P-WDF is the same for all clients sharing the same A-WDF, and wherein the P-WDF may be located on a WDF Controller.

28. The method of claim 26 where P-WDF is the same for all clients sharing the same A-WDF and belonging to the same VLAN, and wherein the P-WDF may be located on a WDF Controller

29. The method of claim 19 where I-WDF is located on one of a switch, a router, a WDF Controller, and another type of device in the network when Centralized-Hierarchical data forwarding mode is selected.

30. The method of claim 29 where WDF located at the WDF Controller for the A-WDF is given priority over others in the selection of I-WDF.

31. The method of claim 29 where I-WDF is the same for all the clients sharing the same A-WDF, and the I-WDF is located on the primary WDF Controller for the A-WDF.

32. The method of claim 29 where I-WDF is the same for all the clients sharing the same A-WDF and belonging to the same VLAN, and I-WDF is located on the primary WDF Controller for the A-WDF.

33. In the computer network system of claim 1, a method of establishing data forwarding tunnels by a WDF Controller between WDF elements for which it is the primary controller to support wireless data flows, the method including one or more of the following steps:

connecting a wireless client to an associated A-WDF wirelessly, to another wireless client with the same A-WDF provided the clients belong to the same VLAN;

connecting the wireless client to the A-WDF wirelessly, and optionally to an associated I-WDF and P-WDF, to a wired host over one of a Layer 2 or Layer 3 network;

connecting a wired host over one of a Layer 2 network and a Layer 3 network to the P-WDF of the wireless client and then the A-WDF of the wireless client;

connecting the wireless client to its A-WDF, optionally to its I-WDF, to its P-WDF, via a Layer 2 or Layer 3 network, to a second wireless client via a P-WDF for the second wireless client, and optionally to an I-WDF and A-WDF for the second wireless client.

34. The method of claim 33 where tunnels are established when a wireless station associates or re-associates to the network.

35. The method of claim 33 wherein tunnels are pre-established by one or more of administrative action, WTP neighborhood information derived from RF Data Collection, and WTP neighborhood information administratively configured.

36. The method of claim 33 where a data forwarding tunnel is established between an A-WDF and a P-WDF selected for a wireless client using the method of claim 19 when Distributed or Centralized data forwarding mode is selected.

37. The method of claim 33 where a data forwarding tunnel is established between an A-WDF and an I-WDF selected for a wireless client using the method of claim 19 when Centralized-Hierarchical data forwarding mode is selected.

38. The method of claim 33 where a data forwarding tunnel is established between an I-WDF and a P-WDF selected for a wireless client using the method of claim 19 when a Centralized-Hierarchical data forwarding mode is selected.

39. The method of claim 19 where a WDF Agent and its PFE are configured not to forward traffic between wireless clients sharing the same A-WDF even when the wireless clients belong to the same VLAN.

40. The method of claim 39 where the configuration is based on one or more of a Security Type, VLAN, IP Subnet, BSS, ESS, Layer 3 Protocol, Multicast Group, wireless client.

63. The system of claim 1, wherein the system is operative to establish data forwarding tunnels between WDF elements with identical or different primary controllers within a community to support wireless data flows that include one or more of a wireless client to its A-WDF over the air, optionally to its I-WDF, to its P-WDF, to a wired host over a Layer 2 or Layer 3 network,

a wired host over a Layer 2 or Layer 3 network to a P-WDF of a wireless client, optionally to its I-WDF,

a wireless client to its A-WDF, optionally to its I-WDF, to its P-WDF, via a Layer 2 or Layer 3 network, to another wireless client via its P-WDF, optionally I-WDF, and A-WDF.

65. The system of claim 63 where a data forwarding tunnel is established between A-WDF and P-WDF selected for a wireless client using method of claim 19 when Distributed or Centralized data forwarding mode is selected.

66. The system of claim 63 where data forwarding tunnel is established between A-WDF and I-WDF selected for a wireless client using method of claim 19 when Centralized-Hierarchical data forwarding mode is selected.

67. The system of claim 63 where data forwarding tunnel is established between I-WDF and P-WDF selected for a wireless client using method of claim 19 when Centralized-Hierarchical data forwarding mode is selected.

68. The system of claim 63 where tunnels are established when a wireless station associates or re-associates to the wireless network.

69. The system of claim 63 where tunnels are pre-established by one of administrative action, WTP neighborhood information derived from RF Data Collection, and WTP neighborhood information that is administratively configured.

70. The system of claim 63, where the data flows include a first wired host over a Layer 2 or Layer 3 network to a second wired host.

41. A computer network system for coordinating integrated wireless-wired network functions between a community of wireless controllers in the same administrative domain in a network, the system comprising:

one or more wireless controllers that implement a logical Wireless Control Plane (WCP), the one or more wireless controllers located in one or more of a server, switch, router and another device in the network;

one or more WDF Controllers in the wireless controller;

one or more WAA Controllers in the wireless controller;

wherein the one or more wireless controllers are operative to perform wireless application coordination, which may further include one or more of the following functions;

wireless data forwarding, mobility, fast roaming, authentication, load balancing, redundancy, RF management, configuration management, and network monitoring.

42. The system of claim 41 where a single WCP at a controller in the community is administratively designated as a Master WCP (M-WCP), and one or more other WCPs are member WCPs (m-WCPs), where

each M-WCP maintains a directory of WCPs in the community,

each M-WCP maintained directory includes attributes for each WCP in the community, including one or more of their IP, DNS or other address, Public-Key and X.509 Certificate,

each m-WCP is provisioned with an address of M-WCP, the address selected from one or more of an IP address and a DNS address, each m-WCP communicates with another m-WCP or M-WCP in the community using a secure protocol, which secure protocol may be one of TLS, IPSEC, and 802.11i.

43. The system of claim 41, wherein the m-WCP is operative to connect to the M-WCP and present one of a Public-Key Certificate, X.509 Certificate and other credential as part of a standards based protocol to be administratively approved before it is allowed into the community.

44. The system of claim 41 where m-WCP properly admitted to the community is operative to download the directory, update the directory from M-WCP at start up, and update the directory when notified by M-WCP of directory changes.

45. The system of claim 41 where connections between WCPs in the community are established dynamically, and shared between various wireless network coordination functions.

46. The system of claim 45 where the connection establishment and configuration sharing between WCPs in the community is based on current WCP neighborhood configuration.

47. The system of claim 45 where a connection is terminated when it is no longer in use based on an aging policy.

48. The system of claim 45 where WCP neighborhood is inferred based on mobility patters of wireless clients.

49. The system of claim 45 where WCP neighborhood is inferred based on RF Neighborhood information derived from RF Data collected at the WTPs where such information about neighboring WTPs includes one or more of SSID of ESSs advertised by neighboring WTP, BSSID advertised by neighboring WTP, identities or addresses or ID of the WCP in the community controlling the WTP, and signal strength.

50. The system of claim 41, further comprising:

one or more WDF elements in the wireless controllers, each of the one or more WDF elements including a PFE.

51. A system of communication of wireless client authentication and association information, the system comprising:

a computer network including fixed-wire and wireless communication;

one or more wireless clients in communication with the computer network;

two or more neighboring controllers in a community, wherein the system is operative to perform one or more of the following;

(a) one or more of the following wireless stations are operative to roam between one of a first Access Point and a first Base Station directly controller by a first controller to one of a second Access Point and a second Base Station directly controlled by a second controller,

(b) determine whether RF data collected by one of a first AP and a second BS directly controlled by the first controller indicates that one of a second AP and a second BS directly controlled by the second controller is an RF neighbor;

(c) determine whether the two or more controllers administratively configured as neighbors.

52. The system of claim 51 in which a wireless client authentication and association state at one controller is communicated to a neighboring controller using IWCPP or other protocol where the state may include one or more of:

security type, authentication type, and encryption type for the association,

encryption keys for the association,

VLAN assigned to the wireless client,

BSSID, identifier/identity of one of an AP and a BS for the association,

A-WDF, I-WDF, and P-WDF identity and endpoint information for the association,

one of a MAC Address and an IP Address of the wireless client,

other policy attributes that may result from authentication.

53. The system of claim 52 in which a controller is operative to:

send to the neighboring controllers wireless client state information when the client successfully authenticates and associates with an AP or BS directly controlled by the controller,

respond to a neighboring controller request with state information when the client associates with an AP or BS directly controlled by the neighboring controller or when the RF data collected by the neighboring controller indicates that a station may potentially roam to an AP or BS in its direct control.

54. The system of claim 52 in which a controller is operative to send to a set of one or more neighboring controllers when the wireless client indicates, via a management, control or data message, that it intends to roam to another AP or BS directly controlled by a controller in the set.

55. A method of authenticating a wireless client to one of an AP and a BS directly controlled by a first controller, the method comprising:

processing messages in an authentication exchange from the wireless client addressed to AP or BS controlled by the first controller that are received at an AP or BS directly controlled by a second controller, further including;

encapsulating, at the AP or BS controlled by the second controller, the messages in one of a WiFi VPN and CAPWAP protocol addressed to the second controller,

receiving and decapsulating the messages at the second controller;

encapsulating the messages in one of IWCPP and another protocol addressed to the first controller,

decapsulating the messages at the first controller;

processing the messages in authentication exchange from the first controller addressed to the wireless client and sending the messages to an AP or BS directly controlled by the second controller, processing the messages further including;

encapsulating the messages in one of IWCPP and another protocol addressed to the second controller,

decapsulating the messages in one of WiFi VPN and CAPWAP protocol addressed to the AP or BS directly controlled by the second controller,

sending the messages wirelessly from one of the AP and the BS controlled by the second controller.

56. The method of claim 55 where the authentication is defined by one of 802.11 i, WPA2, WPA, 802.1x, and 802.16 standards.

57. The method of claim 55 where the second controller determines the address of the first controller from the destination addressing information of the authentication messages based on one of:

an administratively configured mapping of an AP or a BS MAC address or a BSSID to the address of the controller,

a mapping inferred from RF Data collection at the AP or BS directly controlled by the controller where the RF Data collected includes the controller address or identity,

a controller advertising to neighbors or all other controllers in the community information about APs or BSs directly controlled by the controller.

58. A computer network system for forwarding packets through an integrated wired-wireless network, wherein the network supports wireless communication based on one more wireless communication protocols including 802.11, WiFi, 802.16, and WiMax, the system comprising:

one or more wireless data forwarding controllers (WDF controllers), each of which comprises one or more software modules resident upon one of a switch, router, bridge and other network device resident on the network, wherein the one or more wireless data forwarding controllers are in communication with one another via one or more protocols at layers 2 through 7;

a plurality of wireless data forwarding elements (WDF elements), each of the wireless data forwarding element comprising one or more software modules, each of the wireless data forwarding elements associated with a primary wireless data forwarding controller, the primary wireless data forwarding controller selected from the one or more wireless data forwarding controllers, wherein each of the wireless data forwarding elements is located on one of a wireless access point, a wireless Base Station, a networking switch, a router or another device in the network, wherein each wireless data forwarding element is in communication with the primary wireless data forwarding controller associated therewith via one or more protocols at layers 2 through 7;

wherein the system is operative to support the discovery of WDF elements by WDF Controllers in a community other than the primary WDF Controller for the WDF element, wherein such discovery is supported using one of IWCPP and another discovery protocol.

59. The system of claim 58, wherein a WDF Controller advertises administratively permitted WDF elements directly controlled by it to other WDF controllers.

60. The system of claim 58 wherein a first WDF Controller discovers the capabilities of a WDF element directly controlled by a second WDF Controller by directing the queries to the second WDF controller via one of IWCPP and another communications protocol.

61. The system of claim 58 where a first WDF Controller indirectly controls a WDF element directly controlled by a second WDF Controller by directing control messages to the second WDF controller via one of IWCPP and another protocol.

62. The system of claim 58 where a WDF Controller aggregates a subset or all of its WDF elements into a logical WDF element for advertising to other WDF Controllers in the community and processing queries and control messages addressed to the logical aggregate and translating them for processing by its WDF elements.

64. The system of claim 63 where the WDF elements include those directly controlled by a Controller and those discovered using method of claim 58.