Billion BIPAC-74x GE Series User Manual page 94

BIPAC-74x Series Router – 741 GE, 741 GE V2.0 and 743 GE
110 TCP
119 TCP
123 UDP
161 TCP
443 TCP & UDP
1503 TCP
1720 TCP
4000 TCP
7070 UDP
Because NAT can act as a "natural" Internet firewall, your router protects your network from
being accessed by outside users when using NAT, as all incoming connection attempts will point
to your router unless you specifically create Virtual Server entries to forward those ports to a PC
on your network. When your router needs to allow outside users to access internal servers, e.g.
a web server, FTP server, Email server or game server, the router can act as a "virtual server".
You can set up a local server with a specific port number for the service to use, e.g. web/HTTP
(port 80), FTP (port 21), Telnet (port 23), SMTP (port 25), or POP3 (port 110), When an
incoming access request to the router for a specified port is received, it will be forwarded to the
corresponding internal server.
For example, if you set the port number 80 (Web/HTTP) to be mapped to the IP Address
192.168.1.2, then all incoming HTTP requests from outside users will be forwarded to the local
server (PC) with the IP address of 192.168.1.2. If the port is not listed as a predefined
application, you need to add it manually.
In addition to specifying the port number to be used, you will also need to specify the protocol
used. The protocol used is determined by the particular application. Most applications will use
TCP or UDP, however you can specify other protocols using the drop-down Protocol menu.
Setting the protocol to "all" will cause all incoming connection attempts using all protocols on all
port numbers to be forwarded to the specified IP address.
DMZ: The DMZ Host is a local computer exposed to the Internet. When setting a particular
internal IP address as the DMZ Host, all incoming packets will be checked by the Firewall and
NAT algorithms, then passed to the DMZ host when a packet received does not use a port
number used by any other Virtual Server entries.
Chapter 3: Basic Installation and Configuration
POP3 (Post Office Protocol Version 3)
NEWS (Network News Transfer Protocol)
NTP (Network Time Protocol)
SNMP
HTTPS
T.120
H.323
ICQ
RealAudio
90