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11-22 NAT

11.4.2 Example 2: Internet Access with an Inside Server

Figure 11-16 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 later.

11.4.3 Example 3: Multiple Public IP Addresses With Inside Servers

In this example, there are 3 IGAs from our ISP. There are many departments but two have their own FTP

server. All departments share the same router. The example will reserve one IGA for each department with

an FTP server and all departments use the other IGA. Map the FTP servers to the first two IGAs and the

other LAN traffic to the remaining IGA. Map the third IGA to an inside web server and mail server. Four

rules need to be configured, two bi-directional and two uni-directional as follows.

Rule 1. Map the first IGA to the first inside FTP server for FTP traffic in both directions (1 : 1

mapping, giving both local and global IP addresses).

Rule 2. Map the second IGA to our second inside FTP server for FTP traffic in both directions (1 : 1

mapping, giving both local and global IP addresses).

Rule 3. Map the other outgoing LAN traffic to IGA3 (Many : 1 mapping).

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