Patent application number | Description | Published |
20080225718 | Systems and Methods for Providing Global Server Load Balancing of Heterogeneous Devices - The present invention provides improvements to load balancing by providing a load balancing solution that distributes a load among a plurality of heterogenous devices, such as different types of local load balancers, using metrics collected from the different devices. The load balancing appliance collects metrics from heterogenous devices using a network management protocol and communication model, such as a Simple Network Management Protocol (SNMP). These heterogenous device metrics are available on the load balancing appliance with appliance determined metrics and metrics obtained by the appliance from homogenous devices using a metric exchange protocol. Via a configuration interface of the appliance, a user can select one or more of these different metrics for global load balancing. As such, the load balancing appliance described herein obtains a multitude of metrics from the different devices under management. Additionally, the load balancing appliance described herein provides great flexibility in allowing the user to configure the global load balancer based on the user's understanding of these multitudes of metrics and to take into account the different characteristics and behaviors of the heterogenous devices. | 09-18-2008 |
20090037763 | Systems and Methods for Providing IIP Address Stickiness in an SSL VPN Session Failover Environment - The SSL VPN session failover solution of the appliance and/or client agent described herein provides an environment for handling IP address assignment and end point re-authorization upon failover. The appliances may be deployed to provide a session failover environment in which a second appliance is a backup to a first appliance when a failover condition is detected, such as failure in operation of the first appliance. The backup appliance takes over responsibility for SSL VPN sessions provided by the first appliance. In the failover environment, the first appliance propagates SSL VPN session information including user IP address assignment and end point authorization information to the backup appliance. The backup appliance maintains this information. Upon detection of failover of the first appliance, the backup appliance activates the transferred SSL VPN session and maintains the user assigned IP addresses. The backup appliance may also re-authorize the client for the transferred SSL VPN session. | 02-05-2009 |
20090037998 | Systems and Methods for Authorizing a Client in an SSL VPN Session Failover Environment - The SSL VPN session failover solution of the appliance and/or client agent described herein provides an environment for handling IP address assignment and end point re-authorization upon failover. The appliances may be deployed to provide a session failover environment in which a second appliance is a backup to a first appliance when a failover condition is detected, such as failure in operation of the first appliance. The backup appliance takes over responsibility for SSL VPN sessions provided by the first appliance. In the failover environment, the first appliance propagates SSL VPN session information including user IP address assignment and end point authorization information to the backup appliance. The backup appliance maintains this information. Upon detection of failover of the first appliance, the backup appliance activates the transferred SSL VPN session and maintains the user assigned IP addresses. The backup appliance may also re-authorize the client for the transferred SSL VPN session. | 02-05-2009 |
20090300407 | SYSTEMS AND METHODS FOR LOAD BALANCING VIA A PLURALITY OF VIRTUAL SERVERS UPON FAILOVER USING METRICS FROM A BACKUP VIRTUAL SERVER - The present invention provides methods and systems for performing load balancing via a plurality of virtual servers upon a failover using metrics from a backup virtual server. The methods and systems described herein provide systems and methods for an appliance detecting that a first virtual server of a plurality of virtual servers having one or more backup virtual servers load balanced by an appliance is not available, identifying at least a first backup virtual server of a one or more backup virtual servers of the first virtual server is available, maintaining a status of the first virtual server as available in response to the identification, obtaining one or more metrics from the first backup virtual server of a one or more backup virtual servers, and determining the load across the plurality of virtual servers using the metrics obtained from the first backup virtual server associated with the first virtual server. | 12-03-2009 |
20100036951 | SYSTEMS AND METHODS FOR DYNAMIC DECENTRALIZED LOAD BALANCING ACROSS MULTIPLE SITES - A method for enabling decentralized dynamic load balancing among a plurality of appliances providing access to a plurality of sites, each site comprising a local area network and at least one server includes: determining, by a first appliance, a first number of services currently available for access via a local area network connected to the first appliance; receiving, by the first appliance from a second appliance, a communication indicating a second number of services currently available for access via a local area network connected to the second appliance; receiving, by the first appliance, a plurality of requests to connect to a service; determining, by the first appliance, a weight to be assigned to the second appliance, wherein the determination is responsive to the second number; and forwarding, by the first appliance to the second appliance, a subset of the plurality of requests, wherein the number of requests comprising the subset is determined in response to the determined weight. Corresponding systems are also described. | 02-11-2010 |
20100046546 | SYSTEMS AND METHODS FOR PROVIDING DYNAMIC SPILLOVER OF VIRTUAL SERVERS BASED ON BANDWIDTH - The present solution provides a spillover management technique for virtual servers of an appliance based on bandwidth. A network administrator may configure a bandwidth threshold for one or more virtual servers, such as virtual servers providing acceleration or load balancing for one or more services. The bandwidth threshold may be specified as a number of bytes transferred via the virtual server. The bandwidth threshold may also be specified as a round trip time or derivative thereof. A user may specify the bandwidth threshold via a configuration interface. Otherwise, the appliance may establish the bandwidth threshold. The appliance monitors the bandwidth used by a first virtual server. In response to detecting the bandwidth reaching or exceeding the bandwidth threshold, the appliance dynamically directs client requests to a second virtual server. | 02-25-2010 |
20100131659 | Systems and Methods For Load Balancing Real Time Streaming - The present application relates to systems and methods for managing of Real Time Stream Protocol (RTSP) sessions by an intermediary located between a client and a server. An intermediary located between a client and a server receives a response from the server to a request of the client to setup a media stream. The response may include a first session identifier established by the server. The intermediary may encode a port of the server and an internet protocol address of the server into the first session identifier to form a second session identifier. The intermediary may modify the response to identify the second session identifier as the session identifier provided by the server. The intermediary may transmit the modified response to the client responsive to the request of the client to setup the media stream. | 05-27-2010 |
20100191851 | METHOD AND APPLIANCE FOR USING A DYNAMIC RESPONSE TIME TO DETERMINE RESPONSIVENESS OF NETWORK SERVICES - In a method and appliance for determining responsiveness of a service via a particular protocol, a device intermediary to a plurality of clients and a plurality of services determines response times from each of a plurality of services to respond to requests via a first type of protocol of a plurality of protocols. The device calculates an average response time for the first type of protocol from each of the response times of the plurality of services. The device establishes a predetermined threshold for which a response time of a service for the first type of protocol may deviate from the average response time. The device identifies a service as available responsive to determining that a deviation of the response time of the service from the average response falls within the predetermined threshold. | 07-29-2010 |
20100325485 | SYSTEMS AND METHODS FOR STATEFUL SESSION FAILOVER BETWEEN MULTI-CORE APPLIANCES - The present disclosure presents systems and methods for maintaining operation of stateful sessions by a secondary multi-core appliance upon failover of a first multi-core appliance. A stateful session failover module of primary appliance may receive session states from each of the cores of the primary appliance. The stateful session failover module may communicate the session states of the cores of the primary appliance to a stateful session failover module of the secondary appliance. The stateful session failover module of the secondary appliance may update each of the cores of the secondary appliance with the session states. Upon failover, cores of the secondary appliance may maintain operation and features of the sessions handled by the primary appliance prior to failover using the received state sessions for each session maintained. | 12-23-2010 |
20110060840 | APPARATUS, METHOD AND COMPUTER PROGRAM PRODUCT FOR GUARANTEED CONTENT DELIVERY INCORPORATING PUTTING A CLIENT ON-HOLD BASED ON RESPONSE TIME - An apparatus, method and computer program product for guaranteeing network client-server response time while providing a way of putting the client on-hold when the response time temporarily prohibits access to the requested server. The apparatus is implemented within an interface unit connecting a plurality of servers and an on-hold server to the Internet, which is connected to a plurality of clients. According to one aspect of the invention, the method includes the steps of opening a connection between a client and the interface unit; determining which server the client desires a page from; determining the current response time of the requested server; if the response time is acceptable then opening a connection between the interface unit and the requested server if no free connection is open between the interface unit and the requested server; allowing the client to access information on the requested server-via the connections; and closing the connection between the client and the interface unit while keeping open the connection between the interface unit and the requested server. Alternatively, if the response time is not acceptable, then putting the client on-hold by redirecting the client to an on-hold server until the response time of the requested server becomes acceptable. According to a “on-hold distribution” aspect of the invention, the interface unit determines the on-hold preference of the client and selects the server hosting that on-hold preference. According to another aspect of the invention, instead of utilizing the interface unit, each server has the intelligence to put the client on-hold when applicable. | 03-10-2011 |
20110153938 | SYSTEMS AND METHODS FOR MANAGING STATIC PROXIMITY IN MULTI-CORE GSLB APPLIANCE - The present invention is directed towards systems and methods for providing static proximity load balancing via a multi-core intermediary device. An intermediary device providing global server load balancing identifies a size of a location database comprising static proximity information. The intermediary device stores the location database to an external storage of the intermediary device responsive to determining the size of the location database is greater than a predetermined threshold. A first packet processing engine on the device receives a domain name service request for a first location, determines that proximity information for the first location is not stored in a first memory cache, transmits a request to a second packet processing engine for proximity information of the first location, and transmits a request to the external storage for proximity information of the first location responsive to the second packet processing engine not having the proximity information. | 06-23-2011 |
20110222535 | Systems and Methods for Routing VPN Traffic Around Network Distribution - Methods for using a client agent to route client requests among a plurality of appliances using transport layer information include the steps of: establishing, by a client agent executing on a client, a first transport layer connection with a first appliance of a plurality of appliances, the first appliance providing access to one or more servers; establishing, by a client agent executing on the client, a second transport layer connection with a second appliance of a plurality of appliances, the second appliance providing access to one or more servers; intercepting, by the client agent, a packet transmitted by the client; selecting, by the client agent, one of the connections to transmit the intercepted packet based on a characteristic of at least one of: the transport layer connections, the plurality of appliances, or the servers; and transmitting the intercepted packet via the selected connection. | 09-15-2011 |
20120072588 | SYSTEMS AND METHODS FOR LOAD BALANCING VIA A PLURALITY OF VIRTUAL SERVERS UPON FAILOVER USING METRICS FROM A BACKUP VIRTUAL SERVER - The present invention provides methods and systems for performing load balancing via a plurality of virtual servers upon a failover using metrics from a backup virtual server. The methods and systems described herein provide systems and methods for an appliance detecting that a first virtual server of a plurality of virtual servers having one or more backup virtual servers load balanced by an appliance is not available, identifying at least a first backup virtual server of a one or more backup virtual servers of the first virtual server is available, maintaining a status of the first virtual server as available in response to the identification, obtaining one or more metrics from the first backup virtual server of a one or more backup virtual servers, and determining the load across the plurality of virtual servers using the metrics obtained from the first backup virtual server associated with the first virtual server. | 03-22-2012 |
20120158978 | SYSTEMS AND METHODS FOR LOAD BALANCING REAL TIME STREAMING - The present application relates to systems and methods for managing of Real Time Stream Protocol (RTSP) sessions by an intermediary located between a client and a server. An intermediary located between a client and a server receives a response from the server to a request of the client to setup a media stream. The response may include a first session identifier established by the server. The intermediary may encode a port of the server and an internet protocol address of the server into the first session identifier to form a second session identifier. The intermediary may modify the response to identify the second session identifier as the session identifier provided by the server. The intermediary may transmit the modified response to the client responsive to the request of the client to setup the media stream. | 06-21-2012 |
20130318232 | SYSTEMS AND METHODS FOR PROVIDING DYNAMIC CONNECTION SPILLOVER AMONG VIRTUAL SERVERS - A method for an appliance to switch handling of transport layer connection requests from a first virtual server of the appliance managing a first plurality of services to a second virtual server of the appliance managing a second plurality of services upon exceeding, by the first virtual server, a maximum connection threshold determined dynamically from a status of the first plurality of services The appliance establishes a predetermined threshold identifying a maximum active transport layer connection capacity for the first virtual server that comprising a sum of a predetermined connection capacity for each of the plurality of services. The appliance determines via monitoring that the status of a service of the plurality of services indicates the service is not available and adjusts the predetermined threshold to comprise the sum of the predetermined connection capacity for each of the plurality of services having a status of available. | 11-28-2013 |
20140304412 | SYSTEMS AND METHODS FOR GSLB PREFERRED BACKUP LIST - The present application is directed towards systems and methods for a user to configure the backup locations to use by an intermediary device providing Global Server Load Balancing (GSLB) services when a primary location is down. In some embodiments, when GSLB is based on static proximity of the location of the client to the GSLB sites and if the primary location is DOWN, then request may be load balanced among all the other locations. But this may not be desirable in many cases. So we need to provide option to the user to specify the preferred list of backup locations to service a client request. The present solution achieves this configurability by using a GSLB policy based on preferred location. One can configure preferred location(s) via a GSLB policy to redirect the client to preferred location(x). One can configure individual policies for different client locations. Based on implementation requirements, one can configure country level granularity, state level granularity and so on. | 10-09-2014 |
20140304413 | SYSTEMS AND METHODS FOR STARTUP ROUND ROBIN ENHANCEMENT - The present solution allows users, such as administrators to configure slow start parameters for new services. These slow start parameters specify a rate at which requests should be given to a newly added or up service. The users can also chose to automatically increase the load in multiples of the chosen rate by specifying an increment interval. The services are given the configured rate for the interval, and once the interval is reached, the next multiple of the rate of requests is given. The increase of rate of requests is done automatically until an existing service request rate is reached. At that point in time this functionality is disabled and the existing and new services are treated the same. | 10-09-2014 |