From the WebGUI, go to Setup>network>Failover you can find Virtual IP there.
Virtual IP Settings
With this function you can view the MAC address and assign virtual IP settings for your chosen interface. The virtual IP is shared between the failover nodes. For example, primary node has the IP address 192.168.1.1, while secondary node's address is 192.168.1.2. The virtual IP address is 192.168.1.3. In this situation, the primary node (the active node) will be available under 192.168.1.3. In case of primary node failure, the secondary node will take over the 192.168.1.3 address to ensure all connections can continue to the same address.
The Virtual IP needs to be unique within its network environment and the same on both nodes (Primary and Secondary). Changes to virtual IP settings can be done only when failover configuration is not active.
Also Virtual IP can be in a different subnet work than the node IPs, e.g. 192.168.2.1 as opposed to 192.168.1.1 and 192.168.1.2.
AUX= Auxiliary
Auxiliary connection
This option is used to configure the interfaces on which the Failover sends UDP broadcast/unicast traffic. At least two interfaces needs to be specified. If you have chosen to use unicast when configuring failover, you need to inidicate the IP address for the network card on the other node which should respond to the packets sent from the interface you are currently configuring.
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