ZyXEL Communications P-870HW-51A V2 - Figure 54 NAT Port Forwarding; Table 29 NAT Port Forwarding

Chapter 8 Network Address Translation (NAT)
P-870HW-51a v2 User’s Guide
100
You may enter a single port number or a range of port numbers to be forwarded, and the local
IP address of the desired server. The port number identifies a service; for example, web service
is on port 80 and FTP on port 21. In some cases, such as for unknown services or where one
server can support more than one service (for example both FTP and web service), it might be
better to specify a range of port numbers. You can allocate a server IP address that corresponds
to a port or a range of ports.
" Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers
any active services at your location. If you are unsure, refer to your ISP.
To access this screen, click Network > NAT. The following screen appears.
Figure 54 NAT Port Forwarding
The following table describes the labels in this screen.
Table 29 NAT Port Forwarding
LABEL DESCRIPTION
Service Name Select a pre-defined service from the drop-down list box. The pre-defined service
port number(s) and protocol will display in the External port, Internal port and
Protocol fields.
Otherwise, select User Define to open the Rule Setup screen where you can
manually enter the port number(s) and select the IP protocol.
WAN Interface Select the WAN interface through which the service is forwarded.
Server IP
Address
Enter the IP address of the server for the specified service.
External Port
Start
Enter the original destination port for the packets.
To forward only one port, enter the port number again in the External Port End
field.
To forward a series of ports, enter the start port number here and the end port
number in the External Port End field.
External Port
End
Enter the last port of the original destination port range.
To forward only one port, enter the port number in the External Port Start field
above and then enter it again in this field.
To forward a series of ports, enter the last port number in a series that begins with
the port number in the External Port Start field above.