ZyXEL Communications 2WG - Manual (Page 34)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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Application for Non NAT Friendly Support
Some servers providing Internet applications such as some mIRC servers do not allow users to login using the
same IP address. In this case it is better to use Many One-to-One or One-to-One NAT mapping types, thus each
user login to the server is using a unique global IP address. The following figure illustrates this.
One rule configured for using Many One-to-One mapping type is shown below.