User's Manual Part 1

Configuring High Availability
Chapter 5: Managing Your Network 131
Gateway A's priority is 100, and Gateway B's priority is 60. So long as one of
Gateway A's Internet connections is up, Gateway A is the Active Gateway, because
its priority is higher than that of Gateway B.
If both of Gateway A's Internet connections are down, it deducts from its priority
20 (for the primary connection) and 30 (for the secondary connection), reducing its
priority to 50. In this case, Gateway B's priority is the higher priority, and it
becomes the Active Gateway.
You can add individual computers or networks as network objects. This enables
you to configure various settings for the computer or network represented by the
network object.
You can configure the following settings for a network object:
• Static NAT (or One-to-One NAT)
Static NAT allows the mapping of Internet IP addresses or address ranges to
hosts inside the internal network. This is useful if you want a computer in your
private network to have its own Internet IP address. For example, if you have
both a mail server and a Web server in your network, you can map each one to a
separate Internet IP address.
Static NAT rules do not imply any security rules. To allow incoming traffic to a
host for which you defined Static NAT, you must create an Allow rule. When
specifying firewall rules for such hosts, use the host’s internal IP address, and
not the Internet IP address to which the internal IP address is mapped. For
further information, see Using Rules on page 211.
Note: Static NAT and Hide NAT can be used together.