ZyXEL Communications VMG1312-T10C, User Manual

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Chapter 10 Network Address Translation (NAT)
VMG1312-T10C User’s Guide
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specify a range of port numbers. You can allocate a server IP address that corresponds to a port or
a range of ports. Please refer to RFC 1700 for further information about port numbers.
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
Configuring Servers Behind Port Forwarding (Example)
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server ( A in the example),
port 80 to another ( B in the example) and assign a default server IP address of 10.0.0.35 to a third
( C in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address. The
NAT network appears as a single host on the Internet.
Figure 88
Multiple Servers Behind NAT Example
10.3.1 The Port Forwarding Screen
Click Network Setting > NAT to open the Port Forwarding screen.
Figure 89
Network Setting > NAT > Port Forwarding
The following table describes the fields in this screen.
A=10.0.0.33
D=10.0.0.36
C=10.0.0.35
B=10.0.0.34
WAN
LAN
10.0.0.1
IP Address assigned by ISP
Table 48
Network Setting > NAT > Port Forwarding
LABEL DESCRIPTION
WAN Interface Select the WAN interface for which to configure NAT port forwarding rules.
Add new rule Click this to add a new port forwarding rule.
# This is the index number of the entry.