ZyXEL Communications XMG3512-B10A User Manual page 163

Chapter 11 Network Address Translation (NAT)
NAT Application With IP Alias
Fig ure 90
Po rt Fo rwa rding : Se rvic e s a nd Po rt Num b e rs
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 67 Services and Port Numbers
SERVIC ES
ECHO
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name System)
Finger
HTTP (Hyper Text Transfer protocol or WWW, Web)
POP3 (Post Office Protocol)
NNTP (Network News Transport Protocol)
SNMP (Simple Network Management Protocol)
SNMP trap
PPTP (Point-to-Point Tunneling Protocol)
Po rt Fo rwa rding Exa m ple
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (
another ( in the example) and assign a default server IP address of 192.168.1.35 to a third (
B
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PO RT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
in the example), port 80 to
A
in the
C