Any static IP address that you assign for your ViciBox should be in the same subnet as your LAN.
From the router image you sent (via PM), it appears that the router is configured to provide DHCP addresses in the 192.168.0.0/24 address range.
If you can reserve an address for your ViciBox then you can simply configure this to use DHCP and it will get the same address served each time. Alternatively, you might also be able to restrict the range of IP addresses the router can serve, and then you can configure your server to use a static IP (eg 192.168.0.100) outside the DHCP range (192.168.0.2 - 192.168.0.99).