NetScaler Gateway can be deployed in cluster configurations to provide high thoroughput, high availability, and scalability for VPN client traffic. In a cluster, a group of NetScaler Gateway appliances or VMs operates as a single system image to coordinate user sessions and manage traffic to network resources. A NetScaler Gateway cluster can be built with a minimum of two and a maximum of 32 NetScaler Gateway appliances or VMs configured as cluster nodes
You should read the NetScaler Clustering
documentation before starting to configure your NetScaler Gateway cluster. Pay special attention to the following topics in that documentation.
A NetScaler Gateway cluster operates as a spotted VIP configuration type NetScaler cluster.