SMC Networks Barricade SMC2404WBR - Manual (Page 28)

Figure 1.2
Step 4: Select the Specify an IP option and insert an IP address that is not in the
range of the DHCP LAN address. For example, you might want to insert
192.168.2.50 for the IP address if the DHCP LAN address pool is 192.168.2.100
to 192.168.2.199. Then insert 255.255.255.0 for the subnet mask.