ZyXEL P-660HW-T1 User Manual download pdf (Page 106)

P-660H/HW/W-T Series User’ Guide

Chapter 7 Network Address Translation (NAT) Screens 106

7.2 SUA (Single User Account) Versus NAT

SUA (Single User Account) is a ZyNOS implementation of a subset of NAT that supports two

types of mapping, Many-to-One and Server. The Prestige also supports Full Feature NAT

to map multiple global IP addresses to multiple private LAN IP addresses of clients or servers

using mapping types as outlined in Table 25 on page 105.

• Choose SUA Only if you have just one public WAN IP address for your Prestige.

• Choose Full Feature if you have multiple public WAN IP addresses for your Prestige.

7.3 SUA Server

A SUA server 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 SUA 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.

7.3.1 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.

If you do not assign an IP address in Server Set 1 (default server) the Prestige discards all

packets received for ports that are not specified here or in the remote management setup.

7.3.2 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.

Table 26 Services and Port Numbers

SERVICES PORT NUMBER

ECHO 7

FTP (File Transfer Protocol) 21

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 464 465

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ZyXEL P-660HW-T1 User Manual Page 106