Technical Reference - ZyXEL Communications ZyXEL Prestige P-870HW-51a v2 User Manual

Chapter 8 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 30 NAT - DMZ Host
LABEL
Default Server
Save

8.5 Technical Reference

The following section contains additional technical information about the ZyXEL
Device features described in this chapter.
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 31 Services and Port Numbers
SERVICES
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)
Port Forwarding 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
112
DESCRIPTION
Enter the IP address of the default server which receives packets from
ports that are not specified in the
Note: If you do not assign a Default Server, the ZyXEL Device
discards all packets received for ports that are not specified
in the NAT Port Forwarding screen.
Click Save to save your changes back to the ZyXEL Device.
NAT Port Forwarding
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
P-870HW-51a v2 User's Guide
screen.