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Page 146 / 165 Scroll up to view Page 141 - 145
Billion BiPAC 7402NX(L) 802.11n 3G/ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
142
Virtual Server (known as Port Forwarding)
In TCP/IP 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 will usually need to configure
your router to forward these incoming connection attempts using specific ports to the PC on your network
running the application. You will also need to use port forwarding if you want to host an online game
server.
The reason for this is that when using NAT, your publicly accessible IP address will be used by and point
to your router, which then needs to deliver all traffic to the private IP addresses used by your PCs. Please
see the
WAN
configuration section of this manual for more information on NAT.
The device can be configured as a virtual server so that remote users accessing services such as Web or
FTP services via the public (WAN) IP address can be automatically redirected to local servers in the LAN
network. Depending on the requested service (TCP/UDP port number), the device redirects the external
service request to the appropriate server within the LAN network
Page 147 / 165
Billion BiPAC 7402NX(L) 802.11n 3G/ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
143
Add Virtual Server
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.
Application
: Users-define description to identify this entry or click
drop-down menu
to select
existing predefined rules.
:
20 predefined rules are available. Application, Protocol and External/Redirect Ports will be
filled after the selection.
Protocol
: It is the supported protocol for the virtual server. 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.
Time Schedule:
User-defined time period to enable your virtual server. You may specify a time schedule
or Always on for the usage of this Virtual Server Entry. For setup and detail, refer to
Time Schedule
section
External Port:
The Port number on the Remote/WAN side used when accessing the virtual server.
Redirect Port:
The Port number used by the Local server in the LAN network.
Internal IP Address:
The private IP in the LAN network, which will be providing the virtual server
application.
List all existing PCs connecting to the network. You may assign a PC with IP
address and MAC from this list.
Page 148 / 165
Billion BiPAC 7402NX(L) 802.11n 3G/ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
144
Example:
If you like to remote accessing your Router through the Web/HTTP at all time, you would need to enable
port number 80 (Web/HTTP) and map to Router’s IP Address. Then all incoming HTTP requests from you
(Remote side) will be forwarded to the Router with IP address of 192.168.1.254. Since port number 80
has already been predefined, next to the
Application
click
Helper.
A list of predefined rules window will
pop and select
HTTP_Sever
.
Application:
HTTP_Sever
Time Schedule:
Always On
Protocol:
tcp
External Port:
80-80
Redirect Port:
80-80
IP Address:
192.168.1.254
Add:
Click it to apply your settings
.
Edit/Delete:
Click it to edit or delete this virtual server application.
If you have disabled the NAT option in the WAN-ISP section, the Virtual Server
function will hence be invalid.
If the DHCP server option is enabled, you have to be very careful in assigning
the IP addresses of the virtual servers in order to avoid conflicts. The easiest
way of configuring Virtual Servers is to manually assign static IP address to
each virtual server PC, with an address that does not fall into the range of IP
addresses that are to be issued by the DHCP server. You can configure the
virtual server IP address manually, but it must still be in the same subnet as the
router.
Attention
Using port forwarding does have security implications, as outside users will be
able to connect to PCs on your network. For this reason you are advised to use
specific Virtual Server entries just for the ports your application requires,
instead of using DMZ. As doing so will result in all connections from the WAN
attempt to access to your public IP of the DMZ PC specified.
Page 149 / 165
Billion BiPAC 7402NX(L) 802.11n 3G/ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
145
Edit DMZ Host
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.
Cautious:
This Local computer exposing to the Internet may face varies of security risks.
Go to
Configuration
Virtual Server
Edit DMZ Host
o)
Enabled:
It activates your DMZ function.
p)
Disabled:
As set in default setting, it disables the DMZ function.
Internal IP Address:
Give a static IP address to the DMZ Host when
Enabled
radio button is checked.
Be aware that this IP will be exposed to the WAN/Internet.
List all existing PCs connecting to the network. You may assign a PC with IP address and MAC
from this list.
Select the
Apply
button to apply your changes.
Page 150 / 165
Billion BiPAC 7402NX(L) 802.11n 3G/ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
146
Edit One-to-One NAT (Network Address Translation)
One-to-One NAT maps a specific private/local IP address to a global/public IP address.
If you have multiple public/WAN IP addresses from you ISP, you are eligible for One-to-One NAT to utilize
these IP addresses.
Go to
Configuration
Virtual Server
Edit One-to-one NAT
NAT Type:
Select desired NAT type. As set in default setting, it disables the One-to-One NAT function.
Global IP Address:
Subnet:
The subnet of the public/WAN IP address given by your ISP. If your ISP has provided
this information, you may insert it here. Otherwise, use IP Range method.
IP Range:
The IP address range of your public/WAN IP addresses. For example, IP:
192.168.1.1, end IP: 192.168.1.10
Select the
Apply
button to apply your changes.
Check
to create a new One-to-One NAT rule:
Application
: Users-defined description to identify this entry or click
drop-down menu
to select
existing predefined rules.
:
20 predefined rules are available. Application, Protocol and External/Redirect Ports will be
filled after the selection.
Protocol
: It is the supported protocol for the virtual server. 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

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