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Page 96 / 120 Scroll up to view Page 91 - 95
VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
Advanced setting by using IP throttling
With IP throttling you can specify more detail for allocating bandwidth; even the applications are located
in the same level.
Upstream: 928kbps (29*32kbps)
Mission-critical Application: 192kbps (6*32kbps)
Voice Application: 128kbps (4*32kbps)
Restricted Application: 160kbps (5*32kbps)
Other Applications: 448kbps (14*32kbps)
6+4+14+5=29, 29*32kbps=928kbps
Sometime your customers or friends may upload their files to your FTP server and that will saturate your
downstream bandwidth. The settings below help you to limit bandwidth for the restricted application.
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VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
Virtual Server (“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
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VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
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.
Time Schedule:
A self-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
Application
: Users-define description to identify this entry or click
to select existing
predefined rules.
:
20 predefined rules are available.
Click the Radio button to select the rule;
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.
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.
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VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
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.
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
Edit:
Click it to edit this virtual server application.
Delete:
Click it to 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.
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.
Attention
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VoIP/(802.11g) ADSL2+ Router
Chapter 4: Configuration
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.
~
Disabled:
As set in default setting, it disables the DMZ function.
~
Enabled:
It activates your 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.
Listed 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.
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