![background image](http://html1.mh-extra.com/html/zyxel-communications/zyair/zyair_user-manual_943565256.webp)
ZyAIR Wireless Gateway Series User’s Guide
23-8
NAT
In addition to the servers for specified services, NAT supports a default server. A service request that does
not have a server explicitly designated for it is forwarded to the default server. If the default is not defined,
the service request is simply discarded.
Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
The most often used port numbers are shown in the following table. Please refer to
RFC 1700
for further
information about port numbers. Please also refer to the included disk for more examples and details on
NAT.
Table 23-5 Services & Port Numbers
SERVICES PORT
NUMBER
ECHO 7
FTP (File Transfer Protocol)
21
Telnet 23
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
23.3.1 Configuring a Server behind NAT
Follow these steps to configure a server behind NAT:
Step 1.
Enter 15 in the main menu to go to
Menu 15 - NAT Setup.
Step 2.
Enter 2 to display
Menu 15.2 – Port Forwarding Setup
as shown next.
Summary of Contents for ZYAIR
Page 1: ...ZyAIR Wireless Gateway Series User s Guide Version 3 50 July 2003...
Page 20: ......
Page 26: ......
Page 28: ......
Page 36: ......
Page 58: ......
Page 66: ......
Page 98: ......
Page 99: ...WAN III Part III WAN This part covers the web configurator screen and information about WAN...
Page 100: ......
Page 112: ......
Page 130: ......
Page 166: ......
Page 180: ...ZyAIR Wireless Gateway Series User s Guide 15 4 Logs Screens Figure 15 2 Log Settings...
Page 189: ......
Page 205: ......
Page 213: ......
Page 236: ......
Page 246: ......
Page 268: ......
Page 286: ......
Page 294: ......
Page 324: ......
Page 334: ......
Page 340: ......
Page 352: ......
Page 356: ......
Page 368: ......
Page 378: ......