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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 AWS
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Deploy a VPX high-availability pair with elastic IP addresses across different AWS zones
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Deploy a VPX high-availability pair with private IP addresses across different AWS zones
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Configure a Citrix ADC VPX instance to use SR-IOV network interface
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Configure a Citrix ADC VPX instance to use Enhanced Networking with AWS ENA
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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 a Citrix ADC VPX instance to use Azure accelerated networking
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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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Basic components of authentication, authorization, and auditing configuration
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On-premises Citrix Gateway as an identity provider to Citrix Cloud
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Authentication, authorization, and auditing configuration for commonly used protocols
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Troubleshoot authentication and authorization related issues
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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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Client Keep-Alive
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Authentication and authorization for System Users
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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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Client keep-alive
The client keep-alive feature enables multiple clients requests to be sent on a single connection. This feature benefits transaction management. In this environment the web server closes the client connection after serving the response and the client opens a new connection spends more time on the transaction.
Client keep-alive keeps the connection between the client and the appliance (client-side connection) open even after the server closes the connection with the appliance. This allows multiple clients requests using a single connection and saves the round trips associated in opening and closing a connection. Client keep-alive is most beneficial in SSL sessions.
Client keep-alive is useful for the following scenarios:
- If the server does not support the client keep-alive.
- If the server supports but an application on the server does not support the client keep-alive.
Note: Client keep-alive is applicable for HTTP and SSL traffic. Client-keep alive can be configured globally to handle all traffic. Also, you can activate it on specific services.
In the client keep-alive environment, the configured services intercept the client traffic and the client request is directed to the origin server. The server sends the response and closes the connection between the server and the appliance. If a “Connection: Close” header is present in the server response, the appliance corrupts this header in the client-side response, and the client-side connection is kept open. As a result, the client does not have to open a new connection for the next request. Instead, the connection to the server is reopened.
Note: If a server sends back two “Connection: Close” headers, only one is edited. This results in significant delays on the client rendering of the object because a client does not assume that the object has been delivered completely until the connection is closed.
Configure client keep-alive
Client keep-alive, by default, is disabled on the Citrix ADC, both globally and at service level. Therefore, you must enable the feature at the required scope.
Note: If you enable the client keep-alive globally, it is enabled for all services, regardless of whether you enable it at the service level. Also, you must configure some HTTP parameters to specify the following:
the maximum number of HTTP connections retained in the connection reuse pool.
enable connection multiplexing, and enable persistence
Etag
.Note: When Persistent
ETag
is enabled, theETag
header includes information about the server that served the content. This ensures that cache validation conditional requests or browser requests, for that content, always reaches the same server.
Configure client keep-alive by using Citrix ADC command interface
At the command prompt, do the following:
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Enable client keep-alive on the Citrix ADC.
- At global level -
enable ns mode cka
- At service level -
set service <name> -CKA YES
Note:
Client keep-alive can be enabled only for HTTP and SSL services.
- At global level -
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Configure HTTP parameters on the HTTP profile that is bound to one or more services.
set ns httpProfile <name> -maxReusePool <value> -conMultiplex ENABLED -persistentETag ENABLED
Note:
Configure these parameters on the
nshttp_default _profile HTTP
profile, to make them available globally.
Configure client keep-alive by using Citrix ADC GUI
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Enable client keep-alive on the Citrix ADC.
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At global level
Navigate to System > Settings, click Configure Modes and select Client side Keep Alive.
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At service level
Navigate to Traffic Management > Load Balancing > Services, and select the required service. In the Settings section, select Client Keep-Alive check box.
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Configure the required HTTP parameters on the HTTP profile that is bound to one or more services.
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Navigate to System > Profiles, and on HTTP Profiles tab, select the required profile and update the required HTTP parameters.
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