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P100IH ISDN Router
NAT 4-17
Figure 4-18 Specifying an Inside Sever
4.6.3 Example 3 – General Case
In this example, we have 3 IGAs from our ISP. We have many departments but two have their own FTP
server. All departments share the same router. We want to reserve 1 IGA for each department with an FTP
server and the other IGA is used by all. We want to map the FTP servers to the first two of our IGAs and the
other LAN traffic to the remaining IGA. We also want to map out third IGA to an inside web server and mail
server. We need to configure 4 rules, 2 bi-directional and 2 one directional as follows.
Rule 1.
We map our first IGA to our first inside FTP server for FTP traffic in both directions (
1: 1
mapping, giving both local and global IP addresses).
Rule 2.
We map our 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.
We map our other outgoing LAN traffic to IGA3 (
Many : 1
mapping).
Rule 4.
We also map our third IGA to our web server and mail server on the LAN. Type
Server
allows
us to specify multiple servers, of different types, to other machines behind NAT on the LAN.
Our situation looks somewhat like this:
Menu 15.2.1 - Multiple Server Configuration
Port #
----
IP Address
---------------
1
.
Default
192.168.1.10
2.0 0.0.0.0
3.0 0.0.0.0
4.0 0.0.0.0
5.0 0.0.0.0
6. 0 0.0.0.0
7. 0 0.0.0.0
8. 0 0.0.0.0
9. 0 0.0.0.0
10. 0 0.0.0.0
11. 0 0.0.0.0
12. 1025 RR Reserved
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