Advanced Configuration; Network Address Translation Overview; Configuring Sua Server - ZyXEL Communications ZyWall 2we Compact Manual

5 Advanced Configuration

This section shows you how to configure some of the advanced features of the ZyWALL.

5.1 Network Address Translation Overview

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP address of a host
in a packet. For example, the source address of an outgoing packet, used within one network is
changed to a different IP address known within another network.
If you have a single public IP address then choose SUA Only in the Network Address
Translation field of the WAN ISP screen (see section 4.4). If you have multiple public IP
addresses then you may use full feature mapping types (see the User's Guide for more details).
NAT supports five types of IP/port mapping. They are:
1. One-to-One: One-to-one mode maps one local IP address to one global IP address. Note
that port numbers do not change for One-to-One NAT mapping type.
2. Many-to-One: Many-to-One mode maps multiple local IP addresses to one global IP
address. This is equivalent to SUA (that is, PAT, port address translation), ZyXEL's Single
User Account feature.
3. Many-to-Many Overload: Many-to-Many Overload mode maps multiple local IP
addresses to shared global IP addresses.
4. Many One-to-One: Many One-to-One mode maps each local IP address to unique global
IP addresses.
5. Server: This type allows you to specify inside servers of different services behind the NAT
to be accessible to the outside world.

5.2 Configuring SUA Server

A SUA server set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make visible to the outside world even though SUA makes your whole inside network
appear as a single computer to the outside world.
Click SUA/NAT to open the SUA Server screen.
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