Source: http://www.google.com.hk/patents/US8218449
Timestamp: 2013-05-23 04:08:52
Document Index: 31632294

Matched Legal Cases: ['art 3', 'art 3', 'Application No. 2006', 'Application No. 02770460', 'Application No. 06006504', 'Application No. 2007800229623', 'art 11', 'Application No. 2', 'Application No. 02770460', 'Application No. 02770460', 'Application No. 02770460']

�M�Q US8218449 - System and method for remote monitoring in a wireless network - Google �M�Q�j�M �Ϥ� �a�� Play YouTube �s�D Gmail ���ݵw�� ��h »�i���M�Q�j�M | �������� | �n�J�i���M�Q�j�M�M�QIn some embodiments, a method includes combining operations of a wireless access point with operations of a remote probe. An access point links a wireless client to a wireless switch. A remote probe captures wireless packets, appends radio information, and forwards packets to a remote observer for analysis....http://www.google.com.hk/patents/US8218449?utm_source=gb-gplus-share�M�Q US8218449 - System and method for remote monitoring in a wireless network���}��US8218449 B2�X���������v�ӽЮѽs��12/500,392�o�G���2012�~7��10���ӽФ��2009�~7��9�� �u���v���2005�~10��13����L���}�M�Q��US7573859US20070086397US20090274060WO2007044986A2WO2007044986A3�o��HRon Taylor��M�Q�v�HTrapeze Networks, Inc. ���M�Q������370/252370/338��ڱM�Q������H04W24/06H04W24/00H04L12/26 �X�@����H04L63/1408H04L43/12H04L43/18H04W24/00H04W24/06 �ڬw������H04L63/14AH04W24/00H04W24/06H04L43/12H04L43/18�ѦҤ��m�M�Q�ޥ� (100)�D�M�Q�ޥ� (172)�Q�H�U�M�Q�ޥ� (1)�~���s�����M�Q�ӼЧ� ���M�Q�ӼЧ��M�Q����T�� �ڬw�M�Q��System and method for remote monitoring in a wireless networkUS 8218449 B2�K�n In some embodiments, a method includes combining operations of a wireless access point with operations of a remote probe. An access point links a wireless client to a wireless switch. A remote probe captures wireless packets, appends radio information, and forwards packets to a remote observer for analysis. In an embodiment, the observer may provide a protocol-level debug. A system according to the technique can, for example, accomplish concurrent in-depth packet analysis of one or more interfaces on a wireless switch. The system can also, for example, augment embedded security functions by forwarding selected packets to a remote Intrusion Detection System (IDS). In an embodiment, filters on the probes may reduce overhead.
FIG. 1 depicts a system 100 including a wireless access domain. The system 100 includes a computer system 102, a network 104, and a wireless access domain 106. The system 100 may or may not include multiple wireless access domains. The computer system 102 may be practically any type of device that is capable of communicating with a communications network, such as, by way of example but not limitation, a workstation. The network 104 may be practically any type of communications network, such as, by way of example but not limitation, the Internet. The term ��Internet�� as used herein refers to a network of networks which uses certain protocols, such as the TCP/IP protocol, and possibly other protocols such as the hypertext transfer protocol (HTTP) for hypertext markup language (HTML) documents that make up the World Wide Web (the web). The physical connections of the Internet and the protocols and communication procedures of the Internet are well known to those of skill in the art.
The seven layers of the Open System Interconnection (OSI) model, of which Layers 2 and 3 are a part, are well-known to those of skill in the relevant art, and are, therefore, not described herein in any substantial detail. It should be noted, however, that Layer 3 is known as the ��Network Layer�� because it provides switching and routing technologies, creating logical paths, known as virtual circuits, for transmitting data from node to node. Routing and forwarding are functions of this layer, as well as addressing, internetworking, error handling, congestion control and packet sequencing. Layer 2 is known as the ��Data Link Layer�� because at Layer 2 data packets are encoded and decoded into bits; and Layer 2 furnishes transmission protocol knowledge and management and handles errors in the physical layer, flow control and frame synchronization. The data link layer is divided into two sublayers: The Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. The MAC sublayer controls how a computer on the network gains access to the data and permission to transmit it. The LLC layer controls frame synchronization, flow control, and error checking.
In the example of FIG. 1, the wireless access domain 106 includes access areas 108-1 to 108-N (hereinafter collectively referred to as access areas 108). The access areas 108 have characteristics that depend upon, among other things, a radio profile. A radio profile is a group of parameters such as, by way of example but not limitation, beacon interval, fragmentation threshold, and security policies. In an embodiment, the parameters may be configurable in common across a set of radios in one or more access areas 108. In another embodiment, a few parameters, such as the radio name and channel number, must be set separately for each radio. An example of the implementation of a wireless access domain, provided by way of example but not limitation, includes a Trapeze Networks ��identity-aware�� Mobility Domain™.
The computer 202 interfaces to external systems through the communications interface 210, which may include a modem or network interface. It will be appreciated that the communications interface 210 can be considered to be part of the computer system 200 or a part of the computer 202. The communications interface 210 can be an analog modem, ISDN modem, cable modem, token ring interface, satellite transmission interface (e.g. ��direct PC��), or other interfaces for coupling a computer system to other computer systems.
The non-volatile storage 216 is often a magnetic hard disk, an optical disk, or another form of storage for large amounts of data. Some of this data is often written, by a direct memory access process, into memory 212 during execution of software in the computer 202. One of skill in the art will immediately recognize that the terms ��machine-readable medium�� or ��computer-readable medium�� includes any type of storage device that is accessible by the processor 208 and also encompasses a carrier wave that encodes a data signal.
FIG. 4 depicts a system 400 for remote monitoring in a wireless network. In the example of FIG. 4, the system 400, when in operation, includes traffic including, for illustrative purposes, a packet 402. The system 400 also includes a dap 404 and an observer 406. Directory Access Protocol (DAP) is part of X.500, a standard for directory services in a network. Those of skill in the relevant art occasionally refer to a ��dap�� as a networked directory structure and the elements used to monitor and manipulate the directory structure; this convention is used hereinafter. In the example of FIG. 4, the dap 404 includes a snoop filter 408 and a packet filter 410.
In a non-limiting embodiment, TZSP is used to encapsulate 802.11 packets. Packets are captured after they are decrypted on the radio interface 510, so the payload is ��clear�� even when the 802.11 header indicates encrypted data. In a non-limiting embodiment, a radio mac may be added to a TZSP header. In an embodiment, ethereal (e.g., ethereal 0.10.8 or later) may be installed on the IDS 508. Ethereal (and, as another example, tethereal) decode 802.11 packets embedded in TZSP without any configuration. Netcat, for example, may also be installed on the IDS 508, which allows the IDS 508 to listen to UDP packets on the TZSP port. This avoids a constant flow of ICMP destination not reachable messages from the observer back to the radio interface 510. If running on a computer, a tcl script can be used instead.
{condition-list} includes an operator and a packet value. In a non-limiting embodiment, the operator is ��eq�� or ��neq��. Other embodiments may include other operators (e.g., ��lt��, ��gt��). The packet value is a component of an 802.11 packet (bssid, src-mac, frame-type, . . . ). All conditions must be true for a packet filter to match. In a non-limiting embodiment, if the condition list is omitted, all packets are captured. In another non-limiting embodiment, the condition list is a collection of ��AND�� conditions and multiple filters are used for ��OR�� conditions. In a non-limiting embodiment, up to 8 conditions can be listed in a single filter, such conditions may include, by way of example but not limitation:
<oper> is implied ��eq��
set snoop<filter>mode<enable{stop-after<value>|disable> This command starts or stops a filter on all mapped radios. You can use ��all�� in place of <filter> to enable or disable all filters. If stop-after is given, the filter is stopped after a number of matched packets. An active filter creates additional load for the access point and snooped packets can cause network congestion. This may destabilize the access point, so, in a non-limiting implementation, snoop filter state is not persistent.
If active scan is enabled in the radio profile, snoop will capture traffic on other channels. The dwell-times are much longer when active scan is enabled on a disabled radio. In most cases, it's best to either disable active scan or include a condition such as ��channel eq 1�� in the snoop filter to avoid capturing irrelevant data.
Rx Match number of packets received by radio matching the filter Tx Match number of packets sent by radio matching the filter Dropped number of matching packets not forwarded to observer due to memory or network problems Stop-After ��running�� if enabled, ��stopped�� if disabled, or remaining number of packets before filter disabled Stats are cleared whenever a filter is changed or re-enabled.
show configuration area ap This command displays snoop filter references (created with ��set snoop map��), which are stored in the dap configuration.
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