Nat & Port Forwarding Screen - ZyXEL Communications ARMOR G1 NBG6818 User Manual

Table 24 Network > WAN > Internet Connection: PPTP Encapsulation (continued)
L ABEL
Automatically
change the LAN IP
Apply
Cancel
9.5 NAT & Po rt Fo rwa rding Sc re e n
Use Port Forwarding to forward incoming service requests from the Internet to the server(s) on your local
network. Port forwarding is commonly used when you want to host online gaming, P2P file sharing, or
other servers on your network.
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.
Note: TCP port 7547 is reserved for system use.
Note: 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.
C o nfig uring Se rve rs Be hind 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 (A in the example), port 80 to
another (B in the example) and assign a default server IP address of 192.168.123.35 to a third (C in the
example). You assign the LAN IP addresses and the ISP assigns the WAN IP address. The NAT network
appears as a single host on the Internet.
Chapter 9 WAN
DESC RIPT IO N
Select this option to have the NBG6818 change its LAN IP address to 10.0.0.1 or
192.168.123.1 accordingly when the NBG6818 gets a dynamic WAN IP address in the same
subnet as the LAN IP address. See
The NAT, DHCP server and firewall functions on the NBG6818 are still available in this mode.
Click to save your changes back to the NBG6818.
Apply
Click to begin configuring this screen afresh.
C a nc e l
NBG6818 User's Guide
87
Section 9.3.1 on page 78 for more information.