ZyXEL p-660h-61 Guida Utente
Prestige 660H Series User’s Guide
Network Address Translation (NAT) Screens
7-5
If you do not assign an IP address in Server Set 1 (default server), the Prestige discards all packets
received for ports that are not specified here or in the remote management setup.
received for ports that are not specified here or in the remote management setup.
7.3.1 Port Forwarding: Services and Port Numbers
The most often used port numbers are shown in the following table. Please refer to RFC 1700 for
further information about port numbers.
further information about port numbers.
Table 7-3 Services and Port Numbers
SERVICES PORT
NUMBER
ECHO 7
FTP (File Transfer Protocol)
21
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
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.
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.
be forwarded through the Prestige.
IP address
assigned by ISP
assigned by ISP