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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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Exporting Performance Data of Web Pages to AppFlow Collector
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Session Reliability on NetScaler High Availability Pair
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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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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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Session reliability on NetScaler high availability pair
When a network disruption or a device failover occurs during an ICA session, session reconnection can use one of two mechanisms: Session Reliability or Auto Client Reconnect.
Session Reliability, the preferred mode, is a seamless experience for the user. The disruption is barely noticeable for brief network interruptions.
Auto Client Reconnect, the fallback option, involves restarting the client. This mechanism is disruptive for the user and is not always supported.
Receivers can now reconnect their ICA sessions seamlessly using the ICA Session Reliability feature, when HDX Insight is enabled. This feature works both in standalone and in a NetScaler HA pair configuration and even when a NetScaler failover happens.
Note
- NetScaler appliances must be running on software version 11.1 build 49.16 or later.
- Do not enable or disable Session Reliability mode when the NetScaler appliances have active connections.
- Enabling or disabling the feature when connections are still active causes HDX Insight to stop parsing those sessions after a failover occurs and result in loss of information about the sessions.
- Session Reliability on a high availability setup is disabled by default for NetScaler software version 11.1 49.16 or later. Session reliability is supported on a high availability setup only if both the nodes of the setup run the same build (for example, release 11.1 build 53). In other words, session reliability is not supported on a high availability setup if both the nodes run different builds (for example, one node has release 11.1 build 53 whereas the other has release 11.1 build 56).
- When HDX Insight is enabled, basic encryption applications and desktops reconnect after high availability failover even if the
EnableSRonHAFailover parameter
is disabled.
To configure Session reliability from NetScaler CLI:
- At the command line, use the default system administrator credentials to log on to the system.
- To enable Session Reliability on HA failover, at the prompt, type: set ica parameter EnableSRonHAFailover YES
- To disable Session Reliability on HA failover, at the prompt, type: set ica parameter EnableSRonHAFailover NO
To Enable Session reliability on HA failover from NetScaler GUI:
- In a web browser, type the IP address of the primary NetScaler instance in the HA pair (for example, http://192.168.100.1).
- In User Name and Password, enter the administrator credentials.
- On the Configuration tab, navigate to System > Settings, and click Change ICA Parameters.
- In the Change ICA Parameters section, select Session Reliability on HA Failover.
- Click OK.
Limitations
- Enabling this feature results in increased bandwidth consumption which is due to ICA compression being turned off by the feature, and the extra traffic between the primary and secondary nodes to keep them in sync.
- This feature is supported in Active-Passive mode only. Active-Active mode is not currently supported.
- When HDX Insight is enabled, and Session Reliability on the HA knob is set to NO, only ACR reconnect mode is supported in the NetScaler high availability failover scenario. The HA knob does not disable Session Reliability if HDX Insight is disabled.
The Session Reconnect Semantics table is as follows:
Session Reconnect Semantics
Status | EnableSRonHAFailover Yes | EnableSRonHAFailover No (Default) |
---|---|---|
HDX Insight enabled | Session reconnect for ICA Sessions works | Session reconnect for ICA Sessions does not work |
HDX Insight disabled | Session reconnect for ICA Sessions works | Session reconnect for ICA Sessions works |
Points to note
- Session Reliability for ICA sessions works out of the box with Gateway.
- Session Reliability for ICA sessions does not work ONLY when both the following conditions are met:
- HDX Insight is enabled
- EnableSRonHAFailover is set to NO
- Setting the
EnableSRonHAFailover knob
to either YES or NO does not make any difference, when HDX Insight is disabled.
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