ZyXEL Communications Prestige P-870HW-51a v2 - Manual (Page 112)

Chapter 8 Network Address Translation (NAT)
P-870HW-51a v2 User’s Guide
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The following table describes the fields in this screen.
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.
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
Table 30 NAT - DMZ Host
LABEL DESCRIPTION
Default Server Enter the IP address of the default server which receives packets from
ports that are not specified in the
NAT Port Forwarding screen.
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.
Save Click Save to save your changes back to the ZyXEL Device.
Table 31 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