ZyXEL P-661H Series Uživatelský manuál stáhnout pdf (Strana 128)

Chapter 7 Network Address Translation (NAT) Screens

P-661H/HW Series User’s Guide

128

" 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.

7.4.2 Port Forwarding: Services and Port Numbers

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

local network.

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.

7.4.3 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.

Table 51 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

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 357 358

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ZyXEL P-661H Series Uživatelský manuál Strana 128