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Getting Started with NetScaler
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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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Troubleshoot authentication, authorization and auditing issues
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Configure EULA as an authentication factor in NetScaler nFactor system
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Configure periodic Endpoint Analysis scan as a factor in nFactor authentication
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Configure post-authentication Endpoint Analysis scan as a factor in NetScaler nFactor authentication
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Configure pre-authentication Endpoint Analysis scan as a factor in nFactor authentication
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Configure pre-auth and post-auth EPA scan as a factor in nFactor authentication
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Configure prefill user name from certificate in NetScaler nFactor authentication
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Localize error messages generated by NetScaler nFactor system
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Configure NetScaler Gateway preauthentication EPA scan for the domain check
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Distributing traffic across cluster nodes
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Using cluster link aggregation
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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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Create a certificate signing request and use SSL certificates on a NetScaler appliance
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Configure SSL acceleration with HTTP on the front end and SSL on the back end
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Export certificates used on a NetScaler appliance as PFX file
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Configure SSL monitoring when client authentication is enabled on the back-end service
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Configure SSL action to forward client traffic if a cipher is not supported on the ADC
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Configure synchronization of files in a high availability setup
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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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Using cluster link aggregation
Cluster link aggregation is a group of interfaces of cluster nodes. It is an extension of NetScaler link aggregation. The only difference is that, while link aggregation requires the interfaces to be from the same device, in cluster link aggregation, the interfaces are from different nodes of the cluster. For more information about link aggregation, see Configuring Link Aggregation.
Important
Cluster link aggregation is supported for a cluster of hardware (MPX) appliances.
Cluster link aggregation is supported for a cluster of virtual (VPX) appliances that are deployed on ESX and KVM hypervisors, with the following restrictions:
Dedicated interfaces must be used. It means that the interfaces must not be shared with other virtual machines.
When a node becomes INACTIVE, the corresponding cluster LA interface is marked as power DOWN, so that the data traffic is not sent to an INACTIVE node.
When a node becomes ACTIVE, the corresponding cluster LA interface is marked as power ON.
If the cluster link aggregation member interfaces are manually disabled or if cluster link aggregation itself is manually disabled, then interface power down capability is achieved only by the LACP timeout mechanism.
Jumbo MTU is not supported on LACP cluster link aggregation.
Note: Cluster link aggregation is not supported on VPX appliances that are deployed on XenServer®, AWS, and Hyper-V.
- Starting from 12. 0 release, cluster link aggregation is supported on NetScaler SDX appliances.
- The number of interfaces that can be bound to cluster LA is 16 (from each node). The maximum number of interfaces in cluster LA can be (16 * n), where n is the number of nodes in a cluster. The total number of interfaces in cluster LA depends on the number of interfaces for every port channel on the upstream switch.
- If a NetScaler appliance uses Intel Fortville interfaces, the switchover of a cluster node to passive mode might cause a few seconds of outage with CLAG. The issue occurs because LACP is enabled for CLAG to function properly, and the outage time depends on NIC LACP timers.
For example, consider a three-node cluster where all three nodes are connected to the upstream switch. A cluster LA channel (CLA/1) is formed by binding interfaces 0/1/2, 1/1/2, and 2/1/2.
Figure 1. Cluster Link Aggregation topology
A cluster LA channel has the following attributes:
- Each channel has a unique MAC agreed upon by cluster nodes.
- The channel can bind both local and remote nodes’ interfaces.
- A maximum of four cluster LA channels are supported in a cluster.
- Backplane interfaces cannot be part of a cluster LA channel.
- When an interface is bound to a cluster LA channel, the channel parameters have precedence over the network interface parameters. A network interface can be bound to one channel only.
- Management access to a cluster node, must not be configured on a cluster LA channel (for example, CLA/1) or its member interfaces. This is because when the node is INACTIVE, the corresponding cluster LA interface is marked as power down, and therefore looses management access.
Figure 2. Traffic distribution flow using cluster LA
Backup and restore support of cluster LA on NetScaler MPX
You can backup and restore the cluster setup of LA on NetScaler MPX. The cluster LA MAC address is independent of the physical interface MAC address of the cluster nodes, and can change after the backup and restore process. The cluster LA can serve the traffic after a cluster restore process is complete. For more information about backup and restore, see Backup and restore of cluster setup
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