IP Assignments

At least two public IP subnets must be assigned by the ISP. One is for the WAN of the firewall, and one for the inside interface. This is commonly a /30 subnet for the WAN, with a second subnet assigned for the internal interface. This example will use a /30 on WAN as shown in Table 10: WAN IP Block and a /29 public subnet on an internal OPT interface as shown in Table 11: Inside IP Block.

Table 10: WAN IP Block

198.51.100.64/30
IP Address	Assigned To
198.51.100.65	ISP router (AZTCO-FW default gateway)
198.51.100.66	AZTCO-FW WAN interface IP address

Table 11: Inside IP Block

192.0.2.128/29
IP Address	Assigned To
192.0.2.129	AZTCO-FW OPT interface
192.0.2.130	Internal hosts
192.0.2.131
192.0.2.132
192.0.2.133
192.0.2.134