One of the most commonly used topologies has the NetScaler appliance inline between the clients and the servers, with a virtual server configured to handle the client requests. This configuration is used when the clients and servers reside on different subnets. In most cases, the clients and servers reside on public and private subnets, respectively.
For example, consider an appliance deployed in two-arm mode for managing servers S1, S2, and S3, with a virtual server of type HTTP configured on the appliance, and with HTTP services running on the servers. The servers are on a private subnet and a SNIP is configured on the appliance to communicate with the servers. The Use SNIP (USNIP) option must be enabled on the appliance so that it uses the SNIP instead of the MIP.
As shown in the following figure, the VIP is on public subnet 22.214.171.124, and the NSIP, the servers, and the SNIP are on private subnet 192.168.100.0/24.
Figure 1. Topology Diagram for Two-Arm Mode, Multiple Subnets
Task overview: To deploy a NetScaler appliance in two-arm mode with multiple subnets
- Configure the NSIP and default gateway, as described in "Configuring the NetScaler IP Address (NSIP)."
- Configure the SNIP, as described in "Configuring Subnet IP Addresses."
- Enable the USNIP option, as described in "To enable or disable USNIP mode."
- Configure the virtual server and the services, as described in "Creating a Virtual Server" and "Configuring Services."
- Connect one of the network interfaces to a private subnet and the other interface to a public subnet.