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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 |