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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.
Table 34 Services and Port Numbers
SERVICES
ECHO
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name System)
Finger
HTTP (Hyper Text Transfer protocol or WWW, Web)
POP3 (Post Office Protocol)
NNTP (Network News Transport Protocol)
SNMP (Simple Network Management Protocol)
SNMP trap
PPTP (Point-to-Point Tunneling Protocol)
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
B=192.168.1.34
C=192.168.1.35
Basic Home Station VDSL2 P8701T User's Guide
A=192.168.1.33
192.168.1.1
D=192.168.1.36
Chapter 6 Network Address Translation (NAT)
PORT NUMBER
7
21
25
53
79
80
110
119
161
162
1723
IP address assigned by ISP
117
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