ZyXEL Communications P8701T Guia do Utilizador descarregar pdf (Página 117)

Chapter 6 Network Address Translation (NAT)

Basic Home Station VDSL2 P8701T User’s Guide

117

6.5 Technical Reference

The following section contains additional technical information about the VDSL Router features

described in this chapter.

Virtual Server: 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. Please also refer to the Supporting CD for more examples

and details on port forwarding and NAT.

Virtual Server 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.

Figure 40 Multiple Servers Behind NAT Example

Table 34 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

D=192.168.1.36

192.168.1.1

IP address assigned by ISP

A=192.168.1.33

B=192.168.1.34

C=192.168.1.35

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 239 240

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