ZyXEL Communications P-660R-Tx v3 Series Support Notes page 47

(3) Using Multiple Global IP addresses for clients and servers
(One-to-One, Many-to-One, Server Set mapping types are used)
In this case we have 3 IGAs from the ISP. We have two very busy internal FTP
servers and also an internal general server for the web and mail. In this case,
we want to assign the 3 IGAs by the following way using 4 NAT rules.

Rule 1 (One-to-One type) to map the FTP Server 1 with ILA1
(192.168.1.10) to IGA1 (200.0.0.1).

Rule 2 (One-to-One type) to map the FTP Server 2 with ILA2
(192.168.1.11) to IGA2 (200.0.0.2).

Rule 3 (Many-to-One type) to map the other clients to IGA3 (200.0.0.3).

Rule 4 (Server type) to map a web server and mail server with ILA3
(192.168.1.20) to IGA3. Type Server allows us to specify multiple
servers, of different types, to other machines behind NAT on the LAN.
Step 1: In this case, we need to map ILA to more than one IGAs therefore we
must choose the Multiple IPs option from the NAT field in currently active
remote node, and assign IGA3 to P-660R-Tx v3‟s WAN IP Address.
Step 2: Go to Web Configurator, Advanced Setup, Advanced Setup-> NAT ->
IP Address Mapping to begin configuring Address Mapping Set #1. We can
see there are 8 blank rule table that could be configured. See the following
setup for the four rules in our case.
Rule 1 Setup: Select One-to-One type to map the FTP Server 1 with ILA1
(192.168.1.10) to IGA1 (200.0.0.1).
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P-660R-Tx v3 Series Support Notes
P-660R-Tx
v3
47