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Getting Started with Citrix ADC
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Deploy a Citrix ADC VPX instance
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Install a Citrix ADC VPX instance on Microsoft Hyper-V servers
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Install a Citrix ADC VPX instance on Linux-KVM platform
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Prerequisites for Installing Citrix ADC VPX Virtual Appliances on Linux-KVM Platform
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Provisioning the Citrix ADC Virtual Appliance by using OpenStack
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Provisioning the Citrix ADC Virtual Appliance by using the Virtual Machine Manager
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Configuring Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
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Configuring Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
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Provisioning the Citrix ADC Virtual Appliance by using the virsh Program
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Provisioning the Citrix ADC Virtual Appliance with SR-IOV, on OpenStack
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Configuring a Citrix ADC VPX Instance on KVM to Use OVS DPDK-Based Host Interfaces
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Deploy a Citrix ADC VPX instance on Microsoft Azure
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Network architecture for Citrix ADC VPX instances on Microsoft Azure
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Configure multiple IP addresses for a Citrix ADC VPX standalone instance
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Configure a high-availability setup with multiple IP addresses and NICs
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Configure a high-availability setup with multiple IP addresses and NICs by using PowerShell commands
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Configure HA-INC nodes by using the Citrix high availability template with Azure ILB
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Configure address pools (IIP) for a Citrix Gateway appliance
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Upgrade and downgrade a Citrix ADC appliance
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Solutions for Telecom Service Providers
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Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
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Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
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Authentication, authorization, and auditing application traffic
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Configuring authentication, authorization, and auditing policies
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Configuring Authentication, authorization, and auditing with commonly used protocols
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Use an on-premises Citrix Gateway as the identity provider for Citrix Cloud
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Troubleshoot authentication issues in Citrix ADC and Citrix Gateway with aaad.debug module
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Setting the Default Action for a Responder Policy
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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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Retrieve location details from user IP address using geolocation database
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Use source IP address of the client when connecting to the server
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Use client source IP address for backend communication in a v4-v6 load balancing configuration
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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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Authentication and authorization
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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 Citrix ADC Appliance and Cisco IOS Device
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CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Synchronizing Configuration Files in a High Availability Setup
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Restricting High-Availability Synchronization Traffic to a VLAN
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Understanding the High Availability Health Check Computation
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Managing High Availability Heartbeat Messages on a Citrix ADC Appliance
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Remove and Replace a Citrix ADC in a High Availability Setup
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Setting default responder parameters for a responder policy
The Citrix ADC appliance generates an undefined event (UNDEF event) when a request does not match a responder policy. The appliance then performs the default action assigned to undefined events. By default, the action forwards the request to the next feature such as load balancing, content filtering and so forth. This default behavior ensures the requests do not require any specific responder action to be sent to your Web servers. Also, the clients receive access to the content that they have requested.
If one or more websites your Citrix ADC appliance protects receive a significant number of invalid or malicious requests, however, you might want to change the default action to either reset the client connection or drop the request. In this type of configuration, you would write one or more responder policies that would match any legitimate requests, and simply redirect those requests to their original destinations. Your Citrix ADC appliance would then block any other requests as specified by the default action you configured.
You can assign any one of the following actions to an undefined event:
- NOOP. The NOOP action aborts responder processing but does not alter the packet flow. So that the appliance continues to process requests that do not match any responder policy, and eventually forwards them to the requested URL unless another feature intervenes and blocks or redirects the request. This action is appropriate for normal requests to your Web servers and is the default setting.
- RESET. If the undefined action is set to RESET, the appliance resets the client connection, informing the client that it must re-establish its session with the Web server. The action is appropriate for repeat requests for webpages that do not exist, or for connections that might be attempts to hack or probe your protected websites.
- DROP. If the undefined action is set to DROP, the appliance silently drops the request without responding to the client in any way. This action is appropriate for requests that appear to be part of a DDoS attack or other sustained attack on your servers.
Note: UNDEF events are triggered only for client requests. No UNDEF events are triggered for responses.
To set the undefined action by using the Citrix ADC command line:
At the command prompt, type the following command to set the undefined action and verify the configuration:
set responder param -undefAction (RESET|DROP|NOOP)
show responder param
Example:
>set responder param -undefAction RESET
Done
> show responder param
Action Name: RESET
Done
>
Set the undefined action by using the GUI
- Navigate to AppExpert > Responder, and then under Settings, click the Change Responder Settings link.
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In the Set Responder Params page, set the following parameters:
- Global Undefined-Result Action. Undefined-result action is preferred in an unhandled processing exception in the responder policies and actions. Select NOOP, RESET, or DROP.
- Click OK.
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