ZyXEL Communications NBG410W3G - Manual (Page 82)

Chapter 4 Tutorials
NBG410W3G Series User’s Guide
82
Figure 42 Tutorial Example: Status
4.5.3 Public IP Address Mapping
To have the local computers and servers use specific WAN IP addresses, you need to map
static public IP addresses to them.
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The one-to-one NAT address mapping rules are for both incoming and
outgoing connections. The ZyXEL Device forwards traffic that is initiated from
either the LAN or the WAN to the destination IP address.
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The many-to-one or many-to-many NAT address mapping rules are for
outgoing connections only. That means only traffic initiated from the LAN or
returned packets are allowed to go through the ZyXEL Device.
In this example, you create two one-to-one rules to map the internal web server (192.168.1.12)
and mail server (192.168.1.13) to different static public IP addresses. The many-to-one rule
maps a public IP address (1.2.3.4, that is, the ZyXEL Device’s WAN 1 IP address) to outgoing
LAN traffic. It allows other local computers on the same subnet as the ZyXEL Device’s LAN
IP address to use this IP address to access the Internet.