Chapter 11 Network Address Translation (NAT)
NR/FWA Outdoor Series User’s Guide
160
11.6.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical LANs using IP
alias) behind the Zyxel Device can communicate with three distinct WAN networks.
Figure 111 NAT Application With IP Alias
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. Please also refer to the Supporting CD for more examples and details
on port forwarding and NAT.
Table 58 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
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