User's Manual

Chapter 4 Tutorials
AMG1202-T10A User’s Guide
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4.5 Multiple Public and Private IP Address Mappings
If your ISP gives you more than one static IP address for your Internet access, you can map each IP
address for a specific service. This tutorial assumes you are given two static public IP addresses.
You want to map them to two servers A and B.
This tutorial uses the following example settings:
To do this, you can use either of the following settings:
• Full Feature NAT with many-to-many no overload mapping
• Full Feature NAT with one-to-one mapping
4.5.1 Full Feature NAT + Many-to-Many No Overload Mapping
Use this setting if your applications can use random public IP addresses and the applications are
initiated from the Intranet computers (A and B). For example, VoIP application. See Section 4.5.2
on page 51 if it is not.
Table 6 IP Settings in this Tutorial
DEVICE / COMPUTER IP ADDRESS
The ZyXEL Device’s WAN 172.16.1.253 (IP-1)
172.16.1.254 (IP-2)
The ZyXEL Device’s LAN 192.168.1.1
A 192.168.1.2
B 192.168.1.3
C a.b.c.d
A
B
IP-1
IP-2
C
A
B
IP-1
C
1
2