
136 Chapter 8 Network Address Translation (NAT) Screens
NN47923-500
Port forwarding: Services and Port Numbers
The most often used port numbers are shown in Table 25. Refer to Assigned
Numbers (RFC 1700) for further information about port numbers.
Configuring servers behind SUA (example)
For example, you want to assign ports 22-25 to one server, port 80 to another and
assign a default server IP address of 192.168.1.35, as shown in Figure 36.
Table 25 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
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