ZyXEL Prestige 202H Plus ISDN Router 91-003-154001B 用户手册
产品代码
91-003-154001B
P-202H Plus v2 User’s Guide
69
Chapter 6 Network Address Translation (NAT) Screens
6.4.1 Default Server IP Address
In addition to the servers for specified services, NAT supports a default server IP address. A
default server receives packets from ports that are not specified in this screen.
default server receives packets from ports that are not specified in this screen.
Note: If you do not assign an IP address in Server Set 1 (default server), the ZyXEL
Device discards all packets received for ports that are not specified here or in
the remote management setup.
the remote management setup.
6.4.2 Port Forwarding: Services and Port Numbers
Use the NAT - Edit SUA/NAT Server Set screen to forward incoming service requests to the
server(s) on your local network.
server(s) on your local network.
The most often used port numbers are shown in the following table. Please refer to RFC 1700
for further information about port numbers.
for further information about port numbers.
6.4.3 Configuring Servers Behind NAT (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.
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.
Table 12 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