ZyXEL Communications VSG1432-B101 Series User Manual
Chapter 12 Network Address Translation (NAT)
VSG1432-B101 Series User’s Guide
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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 192.168.1.35 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.
the example), port 80 to another (B in the example) and assign a default server IP
address of 192.168.1.35 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 75 Multiple Servers Behind NAT Example
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
Table 52 Services and Port Numbers
SERVICES
PORT NUMBER
D=192.168.1.36
192.168.1.1
IP address assigned by ISP
A=192.168.1.33
B=192.168.1.34
C=192.168.1.35