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Getting Started with Citrix NetScaler
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Deploy a Citrix NetScaler VPX instance
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Install a Citrix NetScaler VPX instance on Microsoft Hyper-V servers
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Install a NetScaler VPX instance on Linux-KVM platform
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Prerequisites for Installing NetScaler VPX Virtual Appliances on Linux-KVM Platform
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Provisioning the NetScaler Virtual Appliance by using OpenStack
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Provisioning the NetScaler Virtual Appliance by using the Virtual Machine Manager
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Configuring NetScaler Virtual Appliances to Use SR-IOV Network Interface
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Configuring NetScaler Virtual Appliances to use PCI Passthrough Network Interface
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Provisioning the NetScaler Virtual Appliance by using the virsh Program
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Deploying NetScaler VPX Instances on AWS
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Upgrade and downgrade a NetScaler appliance
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Overriding Static Proximity Behavior by Configuring Preferred Locations
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Example of a Complete Parent-Child Configuration Using the Metrics Exchange Protocol
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Configuring Global Server Load Balancing for DNS Queries with NAPTR records
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Using the EDNS0 Client Subnet Option for Global Server Load Balancing
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Persistence and persistent connections
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Advanced load balancing settings
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Gradually stepping up the load on a new service with virtual server–level slow start
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Protect applications on protected servers against traffic surges
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Use source IP address of the client when connecting to the server
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Set a limit on number of requests per connection to the server
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Configure automatic state transition based on percentage health of bound services
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Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
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Use case 3: Configure load balancing in direct server return mode
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Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
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Use case 7: Configure load balancing in DSR mode by using IP Over IP
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Use case 10: Load balancing of intrusion detection system servers
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Use case 11: Isolating network traffic using listen policies
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Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Surge protection
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Configuring a CloudBridge Connector Tunnel between two Datacenters
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Configuring CloudBridge Connector between Datacenter and AWS Cloud
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Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
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Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
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Configuring a CloudBridge Connector Tunnel Between a NetScaler Appliance and Cisco IOS Device
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CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Surge protection
When a surge in client requests overloads a server, server response becomes slow, and the server is unable to respond to new requests. The Surge Protection feature ensures that connections to the server occur at a rate that the server can handle. The response rate depends on how surge protection is configured. The NetScaler appliance also tracks the number of connections to the server, and uses that information to adjust the rate at which it opens new server connections.
Surge protection is enabled by default. If you do not want to use surge protection, as will be the case with some special configurations, you must disable it.
The default surge protection settings are sufficient for most uses, but you can configure surge protection to tune it for your needs. First, you can set the throttle value to tell it how aggressively to manage connection attempts. Second you can set the base threshold value to control the maximum number of concurrent connections that the NetScaler appliance will allow before triggering surge protection. (The default base threshold value is set by the throttle value, but after setting the throttle value you can change it to any number you want.)
The following figure illustrates how surge protection is configured to handle traffic to a Web site.
Figure 1. A Functional Illustration of NetScaler Surge Protection
Note: If the NetScaler appliance is installed at the edge of the network, where it interacts with network devices on the client side of the Internet, the surge protection feature must be disabled. Surge protection must also be disabled if you enable USIP (Using Source IP) mode on your appliance.
The following example and illustration show the request and response rates for two cases. In one case, surge protection is disabled, and in the other it is enabled.
When surge protection is disabled and a surge in requests occurs, the server accepts as many requests as it can process concurrently, and then begins to drop requests. As the server becomes more overloaded, it goes down and the response rate is reduced to zero. When the server recovers from the crash, usually several minutes later, it sends resets for all pending requests, which is abnormal behavior, and also responds to new requests with resets. The process repeats for each surge in requests. Therefore, a server that is under DDoS attack and receives multiple surges of requests can become unavailable to legitimate users.
When surge protection is enabled and a surge in requests occurs, surge protection manages the rate of requests to the server, sending requests to the server only as fast as the server can handle those requests. This enables the server to respond to each request correctly in the order it was received. When the surge is over, the backlogged requests are cleared as fast as the server can handle them, until the request rate matches the response rate.
The following figure compares the request and response scenarios when surge protection is enabled to that when it is disabled.
Figure 2. Request/Response Rate with and without Surge Protection
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