Zyxel-communications 802.11g Wireless ADSL2+ 4-port VoIP IAD P-2602HWNL Uživatelský manuál stáhnout pdf (Strana 158)

P-2602HWNLI User’s Guide

158 Chapter 10 Network Address Translation (NAT) Screens

10.4 Port Forwarding

A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or

FTP, that you can make visible to the outside world even though NAT makes your whole

inside network appear as a single computer to the outside world.

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.

10.4.1 Default Server IP Address

In addition to the servers for specified services, NAT supports a default server IP address. A

default server receives packets from ports that are not specified in this screen.

Note: If you do not assign a Default Server IP address, the ZyXEL Device discards

all packets received for ports that are not specified here or in the remote

management setup.

10.4.2 Port Forwarding: Services and Port Numbers

Use the Port Forwarding screen to forward incoming service requests to the server(s) on your

local network. See Appendix G on page 407 for a list of commonly used services and port

numbers.

10.4.3 Configuring Servers Behind 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 addresses and the ISP

assigns the WAN IP address. The NAT network appears as a single host on the Internet.

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