Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
Install a Citrix ADC VPX instance on Microsoft Hyper-V servers
Install a Citrix ADC VPX instance on Linux-KVM platform
Prerequisites for Installing Citrix ADC VPX Virtual Appliances on Linux-KVM Platform
Provisioning the Citrix ADC Virtual Appliance by using OpenStack
Provisioning the Citrix ADC Virtual Appliance by using the Virtual Machine Manager
Configuring Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
Configuring Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
Provisioning the Citrix ADC Virtual Appliance by using the virsh Program
Provisioning the Citrix ADC Virtual Appliance with SR-IOV, on OpenStack
Configuring a Citrix ADC VPX Instance on KVM to Use OVS DPDK-Based Host Interfaces
Deploy a Citrix ADC VPX instance on Microsoft Azure
Network architecture for Citrix ADC VPX instances on Microsoft Azure
Configure multiple IP addresses for a Citrix ADC VPX standalone instance
Configure a high-availability setup with multiple IP addresses and NICs
Configure a high-availability setup with multiple IP addresses and NICs by using PowerShell commands
Configure HA-INC nodes by using the Citrix high availability template with Azure ILB
Configure address pools (IIP) for a Citrix Gateway appliance
Upgrade and downgrade a Citrix ADC appliance
Solutions for Telecom Service Providers
Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
Authentication, authorization, and auditing application traffic
Configuring authentication, authorization, and auditing policies
Configuring Authentication, authorization, and auditing with commonly used protocols
Use an on-premises Citrix Gateway as the identity provider for Citrix Cloud
Troubleshoot authentication issues in Citrix ADC and Citrix Gateway with aaad.debug module
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Persistence and persistent connections
Advanced load balancing settings
Gradually stepping up the load on a new service with virtual server–level slow start
Protect applications on protected servers against traffic surges
Retrieve location details from user IP address using geolocation database
Use source IP address of the client when connecting to the server
Use client source IP address for backend communication in a v4-v6 load balancing configuration
Set a limit on number of requests per connection to the server
Configure automatic state transition based on percentage health of bound services
Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
Use case 3: Configure load balancing in direct server return mode
Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
Use case 7: Configure load balancing in DSR mode by using IP Over IP
Use case 10: Load balancing of intrusion detection system servers
Use case 11: Isolating network traffic using listen policies
Use case 12: Configure Citrix Virtual Desktops for load balancing
Use case 13: Configure Citrix Virtual Apps for load balancing
Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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HTTP denial-of-service protection
Tune the client detection/JavaScript challenge response rate
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Authentication and authorization
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Configuring a CloudBridge Connector Tunnel between two Datacenters
Configuring CloudBridge Connector between Datacenter and AWS Cloud
Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
Configuring a CloudBridge Connector Tunnel Between a Citrix ADC Appliance and Cisco IOS Device
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Tuning the client detection/JavaScript challenger response rate
After you have enabled and configured HTTP DoS protection, if more than the maximum specified number of clients are waiting in the Citrix ADC surge queue for the HTTP DoS service, the HTTP DoS protection function is triggered. The default rate of challenged JavaScript responses sent to the client is one percent of the server response rate. The default response rate is inadequate in many real attack scenarios, however, and may need to be tuned.
For example, assume that the Web server is capable of a maximum of 500 responses/sec, but is receiving 10,000 Gets/sec. If 1% of the server responses are sent as JavaScript challenges, responses are reduced to almost none: 5 client (500 *0.01) JavaScript responses, for 10000 waiting client requests. Only about 0.05% of the real clients receive JavaScript challenge responses. However, if the client detection/JavaScript challenge response rate is very high (for example, 10%, generating 1000 challenge JavaScript responses per second), it may saturate the upstream links or harm the upstream network devices. Exercise care when modifying the defaultClient Detect Ratevalue.
If the configured triggering surge queue depth is, for example, 200, and the surge queue size is toggling between 199 and 200, the Citrix ADC toggles between the “attack” and “no-attack” modes, which is not desirable. The HTTP DoS feature includes a window mechanism with a default size of 20. After the surge queue size reaches the specified queue depth value, triggering “attack” mode, the surge queue size must fall to 20 less than the specified queue depth for the Citrix ADC appliance to enter “no-attack” mode. In the example, the surge queue size must fall below 180 before the appliance enters “no-attack” mode. During configuration, you must specify a value more than 20 for theQDepthparameter when adding a DoS policy or setting a DoS policy.
The triggering surge queue depth should be configured on the basis of previous observations of traffic characteristics. For more information about setting up a correct configuration, seeGuidelines for HTTP DoS protection deployment.
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