ZyXEL Communications 2304R-P1 User Manual

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Prestige 2304 Support Notes

When do I need Multi-NAT?

a. Make local server accessible from outside Internet

When NAT is enabled the local computers are not accessible from outside. You can use Multi-NAT to make an

internal server accessible from outside.

a. Support Non-NAT Friendly Applications

Some servers providing Internet applications such as some mIRC servers do not allow users to login using the

same IP address. Thus, users on the same network can not login to the same server simultaneously. In this case

it is better to use Many-to-Many No Overload or One-to-One NAT mapping types, thus each user login to the

server using a unique global IP address.

What IP/Port mapping does Multi-NAT support?

NAT supports five types of IP/port mapping. They are: One to One, Many to One, Many to Many Overload,

Many to Many No Overload and Server. The details of the mapping between ILA and IGA are described as

below. Here we define the local IP addresses as the Internal Local Addresses (ILA) and the global IP addresses

as the Inside Global Address (IGA),

1. One to One

In One-to-One mode, the Prestige maps one ILA to one IGA.

2. Many to One

In Many-to-One mode, the Prestige maps multiple ILA to one IGA. This is equivalent to SUA (i.e., PAT, port

address translation), ZyXEL's Single User Account feature that previous ZyNOS routers supported (the SUA

only option in today's routers).

3. Many to Many Overload

In Many-to-Many Overload mode, the Prestige maps the multiple ILA to shared IGA.

4. Many to Many No Overload

In Many-to-Many No Overload mode, the Prestige maps each ILA to unique IGA.

5. Server