ZyXEL Communications ZyXEL Prestige 660R, User Manual

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Prestige 660R ADSL 2+ Access Gateway
7-6 NAT
Table 7-3 Services and Port Numbers
SERVICES PORT NUMBER
POP3 (Post Office Protocol) 110
NNTP (Network News Transport Protocol) 119
SNMP (Simple Network Management Protocol) 161
SNMP trap 162
PPTP (Point-to-Point Tunneling Protocol) 1723
7.3.2 Configuring Servers Behind SUA (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.
Figure 7-3 Multiple Servers Behind NAT Example
7.4 Selecting the NAT Mode
You must create a firewall rule in addition to setting up SUA/NAT, to allow traffic
from the WAN to be forwarded through the Prestige.
Click NAT to open the following screen.
IP address assigned
by ISP.