Example 2: Internet Access With An Inside Server; Figure 6-14 Nat Example 2 - ZyXEL Communications ZyXEL ZyWALL 50 User Manual

ZyWALL 50 Internet Security Gateway
From menu 4 shown above, simply choose the SUA Only option from the Network Address Translation
field. This is the Many-to-One mapping discussed in section 6.5. The SUA Only read-only option from the
Network Address Translation field in menus 4 and 11.3 is specifically pre-configured to handle this case.

6.5.2 Example 2: Internet Access with an Inside Server

Figure 6-14 NAT Example 2

In this case, you do exactly as above (use the convenient pre-configured SUA Only set) and also go to
menu 15.2 to specify the Inside Server behind the NAT as shown in the next figure.
NAT 6-17