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Getting Started with NetScaler
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Deploy a NetScaler VPX instance
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Optimize NetScaler VPX performance on VMware ESX, Linux KVM, and Citrix Hypervisors
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Apply NetScaler VPX configurations at the first boot of the NetScaler appliance in cloud
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Configure simultaneous multithreading for NetScaler VPX on public clouds
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Install a 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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Provisioning the NetScaler virtual appliance with SR-IOV on OpenStack
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Configuring a NetScaler VPX instance on KVM to use OVS DPDK-Based host interfaces
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Deploy a NetScaler 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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Protect AWS API Gateway using the NetScaler Web Application Firewall
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Configure a NetScaler VPX instance to use SR-IOV network interface
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Configure a NetScaler VPX instance to use Enhanced Networking with AWS ENA
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Deploy a NetScaler VPX instance on Microsoft Azure
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Network architecture for NetScaler VPX instances on Microsoft Azure
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Configure multiple IP addresses for a NetScaler 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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Deploy a NetScaler high-availability pair on Azure with ALB in the floating IP-disabled mode
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Configure a NetScaler VPX instance to use Azure accelerated networking
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Configure HA-INC nodes by using the NetScaler high availability template with Azure ILB
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Configure a high-availability setup with Azure external and internal load balancers simultaneously
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Configure a NetScaler VPX standalone instance on Azure VMware solution
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Configure a NetScaler VPX high availability setup on Azure VMware solution
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Configure address pools (IIP) for a NetScaler Gateway appliance
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Deploy a NetScaler VPX instance on Google Cloud Platform
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Deploy a VPX high-availability pair on Google Cloud Platform
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Deploy a VPX high-availability pair with external static IP address on Google Cloud Platform
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Deploy a single NIC VPX high-availability pair with private IP address on Google Cloud Platform
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Deploy a VPX high-availability pair with private IP addresses on Google Cloud Platform
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Install a NetScaler VPX instance on Google Cloud VMware Engine
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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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Web Application Firewall protection for VPN virtual servers and authentication virtual servers
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On-premises NetScaler 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 12: Configure Citrix Virtual Desktops for load balancing
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Use case 13: Configure Citrix Virtual Apps and Desktops for load balancing
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Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Use case 15: Configure layer 4 load balancing on the NetScaler appliance
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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 NetScaler Appliance and Cisco IOS Device
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CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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High Availability FAQs
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What are the various ports used to exchange the HA-related information between the nodes in an HA configuration?
In an HA configuration, both nodes use the following ports to exchange HA-related information:
- UDP Port 3003, to exchange heartbeat packets.
- TCP Port 3008 or 3010, for synchronization and command propagation.
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What are the conditions that trigger synchronization?
Synchronization is triggered by any of the following conditions:
- The incarnation number of the primary node, received by the secondary, does not match that of the secondary node.
Note: Both nodes in an HA configuration maintain a counter called
incarnation number, which counts the number of configurations in the node’s configuration file. Each node sends its incarnation number to each other node in the heartbeat messages. The incarnation number isn’t incremented for the following commands:
- All HA configuration related commands. For example, add ha node, set ha node, and bind ha node.
- All Interface related commands. For example, set interface and unset interface.
- All channel-related commands. For example, add channel, set channel, and bind channel.
- The secondary node comes up after a restart.
- The primary node becomes secondary after a failover.
- The incarnation number of the primary node, received by the secondary, does not match that of the secondary node.
Note: Both nodes in an HA configuration maintain a counter called
incarnation number, which counts the number of configurations in the node’s configuration file. Each node sends its incarnation number to each other node in the heartbeat messages. The incarnation number isn’t incremented for the following commands:
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What configurations aren’t synced or propagated in an HA configuration in INC or non-INC mode?
The following commands are neither propagated nor synced to the secondary node:
- All node specific HA configuration commands. For example, add ha node, set ha node, and bind ha node.
- All Interface related configuration commands. For example, set interface and unset interface.
- All channel related configuration commands. For example, add channel, set channel, and bind channel.
Note:
The following configurations are neither synced nor propagated only in HA in INC mode. Each node has its own:
- SNIPs
- VLANs
- Routes (except LLB routes)
- Route monitors
- RNAT rules (except any RNAT rule with VIP as the NAT IP)
- Dynamic routing configurations
- Net profiles
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Does a configuration added to the secondary node get synchronized on the primary?
No, a configuration added to the secondary node isn’t synchronized to the primary.
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What can be the reason for both nodes claiming to be the primary in an HA configuration?
The most likely reason is that the primary and secondary nodes are both healthy but the secondary does not receive the heartbeat packets from the primary. The problem can be with the network between the nodes.
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Does an HA configuration run into any issues if you deploy the two nodes with different system clock settings?
Different system-clock settings on the two nodes can cause the following issues:
- The time stamps in the log file entries do not match. This situation makes it difficult to analyze the log entries for any issues.
- After a failover, you might have problems with any type of cookie-based persistence for load balancing. A significant difference between the times can cause a cookie to expire sooner than expected, resulting in termination of the persistence session.
- Similar considerations apply to any time-related decisions on the nodes.
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What are the conditions for failure of the force HA sync command?
Forced synchronization fails in any of the following circumstances:
- You force synchronization when synchronization is already in progress.
- You force synchronization on a standalone NetScaler appliance.
- The secondary node is disabled.
- HA synchronization is disabled on the current secondary node.
- HA propagation is disabled on the current primary node and you force synchronization from the primary.
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What are the conditions for failure of the sync HA files command?
Synchronizing configuration files fail in either of the following circumstances:
- On a standalone system.
- With the secondary node disabled.
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In an HA configuration, if the secondary node takes over as the primary, does it switch back to secondary status if the original primary comes back online?
No. After the secondary node takes over as the primary, it remains as primary even if the original primary node comes back online again. To interchange the primary and secondary status of the nodes, run the force failover command.
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What are the conditions for failure of the force failover command?
A forced failover fails in any of the following circumstances:
- You force failover on a standalone system.
- The secondary node is disabled.
- The secondary node is configured to remain secondary.
- The primary node is configured to remain primary.
- The state of the peer node is unknown.
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