Virtual Server - BEC 8800N User Manual

Virtual Server

Virtual Server allows you to direct incoming traffic from WAN side (identified by Protocol and
External port) to the Internal server with private IP address on the LAN side. The Internal port is
required only if the external port needs to be converted to a different port number used by the
server on the LAN side.
In TCP and UDP networks a port is a 16-bit number used to identify which application program
(usually a server) incoming connections should be delivered to. Some ports have numbers that
are pre-assigned to them by the IANA (the Internet Assigned Numbers Authority), and these are
referred to as "well-known ports". Servers follow the well-known port assignments so clients can
locate them.
If you wish to run a server on your network that can be accessed from the WAN (i.e. from other
machines on the Internet that are outside your local network), or any application that can accept
incoming connections (e.g. Peer-to-peer/P2P software such as instant messaging applications and
P2P file-sharing applications) and are using NAT (Network Address Translation), then you need to
configure your router to forward these incoming connection attempts using specific ports to the PC
on your network running the application. You also need to use port forwarding if you wish to host
an online game server.
Examples of well-known and registered port numbers are shown below, for further information,
please see IANA's website at:
Well-known and Registered Ports
Port Number
20 TCP
21 TCP
22 TCP & UDP
23 TCP
25 TCP
53 TCP & UDP
69 UDP
80 TCP
110 TCP
119 TCP
123 UDP
161 TCP
443 TCP & UDP
1503 TCP
1720 TCP
4000 TCP
7070 UDP
http://www.iana.org/assignments/port-numbers
Protocol
FTP Data
FTP Control
SSH Remote Login Protocol
TElnet
SMTP (simple Mail Transfer Protocol)
DNS (Domain Name Server)
TFTP (Trivial File Transfer Protocol)
World Wide Web HTTP
POP3 (Post Office Protocol version 3)
NEWS (Network News Transfer Protocol)
NTP (Network Time Protocol)
SNMP
HTTPS
T.120
H.323
ICQ
Real Audio
Description
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