ZyXEL Communications P-861H-G1, User Manual, Page: 90 / 341

Prestige 861H Series User’s Guide
89 Chapter 6 Network Address Translation (NAT) Screens
6.3.3 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.
IP address assigned by ISP.
Figure 30 Multiple Servers Behind NAT Example
6.4 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.
SMTP (Simple Mail Transfer Protocol) 25
DNS (Domain Name System) 53
Finger 79
HTTP (Hyper Text Transfer protocol or WWW, Web) 80
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
Table 17 Services and Port Numbers (continued)
SERVICES PORT NUMBER