ROGER D SANDS
Broker in Princeton, MA
License number
Massachusetts 123771
Issued Date
Oct 15, 1990
Expiration Date
Jul 9, 1997
Type
Salesperson
Address
Address
Princeton, MA 01541
Professional information
Fast Roaming In A Wireless Network Using Per-Sta Pairwise Master Keys Shared Across Participating Access Points
US Patent:
7873352, Jan 18, 2011
Filed:
May 9, 2006
Appl. No.:
11/430547
Inventors:
Hien Nguyen - Northborough MA, US
Pierre Trudeau - Lorraine, CA
Anil Gupta - Shrewsbury MA, US
Roger D. Sands - Princeton MA, US
Thomas S. Stefanski - Westford MA, US
Pierre Trudeau - Lorraine, CA
Anil Gupta - Shrewsbury MA, US
Roger D. Sands - Princeton MA, US
Thomas S. Stefanski - Westford MA, US
Assignee:
Hewlett-Packard Company - Palo Alto CA
International Classification:
H04M 1/66, H04W 36/00, H04W 4/00
US Classification:
455411, 4554221, 455436
Abstract:
A fast roaming (handoff) service is provided for a WLAN infrastructure. A given mobile station (STA) obtains a pairwise master key (PMK) when it associates with an access point (AP) in the infrastructure. A neighbor graph identifies prospective APs to which the STA may then roam. At initialization, preferably the neighbor graph is fully-connected (i. e. , each AP is assumed to be connected to every other AP). The PMK (obtained by the STA initially) is shared proactively with the neighbor APs as indicated in the neighbor graph. Thus, when the STA roams to a neighbor AP, because the PMK is already available, there is no requirement that the STA initiate a real-time request to an authentication server to re-associate to the new AP. Further, the new AP causes an update to the neighbor graph information implicitly by simply issuing a notification that it is now handling the STA that arrived from the prior AP; in this manner, the prior AP is confirmed as a neighbor, but there is no requirement for any inter-AP dialog before a given neighbor graph is updated. As roaming occurs the neighbor graph is pruned down (to reflect the actual neighbor AP connections) using the implicit notification data.
Seamless Roaming Across Wireless Subnets Using Source Address Forwarding
US Patent:
8018900, Sep 13, 2011
Filed:
Dec 28, 2006
Appl. No.:
11/646904
Inventors:
Richard H. Blanchette - Hopkinton MA, US
Martin Bouchard - Montréal, CA
Anil Gupta - Shrewsbury MA, US
Yannick Koehler - Montréal, CA
Gilbert Moineau - Lachine, CA
Fréderic D. Mouveaux - Laval, CA
Roger D. Sands - Princeton MA, US
Pierre Trudeau - Lorraine, CA
Martin Bouchard - Montréal, CA
Anil Gupta - Shrewsbury MA, US
Yannick Koehler - Montréal, CA
Gilbert Moineau - Lachine, CA
Fréderic D. Mouveaux - Laval, CA
Roger D. Sands - Princeton MA, US
Pierre Trudeau - Lorraine, CA
Assignee:
Hewlett-Packard Company - Palo Alto CA
International Classification:
H04W 4/00, H04W 36/00, H04L 12/28
US Classification:
370331, 370338, 370401, 4554321, 455436, 455442
Abstract:
To enable devices to detect L3 roaming users and to take appropriate forwarding actions, L3 knowledge is introduced inside a bridge in a non-intrusive way. In particular, as a client moves from a subnet associated with a first network element to a subnet associated with a second network element, a determination is made regarding whether the client is roaming. This is done by evaluating a source IP address within a L3 packet header within a first frame received at the second network element. If, as a result of the evaluating step, it is determined that the client is roaming, an L2 bridge forwarding table in the second network element is configured to include a source MAC address of the client together with information identifying at least a destination interface for use in directing client data traffic back towards the subnet associated with the first network element. The first frame is then forwarded. In one embodiment, the traffic is directed back towards the subnet associated with the first network element via a GRE encapsulation tunnel, although any convenient tunneling mechanism can be used.
Network Apparatus Enabling Roaming Across Subnets
US Patent:
8503396, Aug 6, 2013
Filed:
Aug 4, 2011
Appl. No.:
13/198084
Inventors:
Richard H. Blanchette - Hopkinton MA, US
Martin Bouchard - Montréal, CA
Anil Gupta - Shrewsbury MA, US
Yannick Koehler - Montréal, CA
Gilbert Moineau - Lachine, CA
Fréderic D. Mouveaux - Laval, CA
Roger D. Sands - Princeton MA, US
Pierre Trudeau - Lorraine, CA
Martin Bouchard - Montréal, CA
Anil Gupta - Shrewsbury MA, US
Yannick Koehler - Montréal, CA
Gilbert Moineau - Lachine, CA
Fréderic D. Mouveaux - Laval, CA
Roger D. Sands - Princeton MA, US
Pierre Trudeau - Lorraine, CA
Assignee:
Hewlett-Packard Development Company, L.P. - Houston TX
International Classification:
H04W 4/00, H04H 20/71, H04L 12/66, H04L 12/28, H04B 1/16
US Classification:
370331, 370312, 370328, 370352, 370401, 3703952, 455436, 4554322
Abstract:
To enable a network apparatus to detect L3 roaming users and to take appropriate forwarding actions, L3 knowledge is introduced inside an L2 bridge forwarding table in the network apparatus. As a client moves from a subnet associated with a first network element to a subnet associated with the network apparatus, a determination is made regarding whether the client is roaming by evaluating a source IP address within a L3 packet header within a first frame received at the network apparatus. If, as a result of the evaluating step, it is determined that the client is roaming, the L2 bridge forwarding table is configured to include a source MAC address of the client together with information identifying a destination interface for use in directing client data traffic back towards the subnet associated with the first network element.