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4.3.4 Virtual Server/Port Forwarding
Port forwarding is a method to direct network traffic from the
Internet to a specific port or a specific range of ports to a device
or number of devices on your local network. Setting up Port
Forwarding on your router allows PCs outside the network to
access specific services provided by a PC in your network.
NOTE:
When port forwarding is enabled, the ASUS router blocks
unsolicited inbound traffic from the Internet and only allows replies
from outbound requests from the LAN. The network client does not
have access to the Internet directly, and vice versa.
To set up Port Forwarding:
1.
From the navigation panel, go to
Advanced Settings
>
WAN
>
Virtual Server / Port Forwarding
tab.
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67
2.
Configure the following settings below. When done, click
Apply
.
•
Enable Port Forwarding
: Choose
Yes
to enable Port
Forwarding.
•
Famous Server List
: Determine which type of service you
want to access.
•
Famous Game List
: This item lists ports required for popular
online games to work correctly.
•
FTP Server Port
: Avoid assigning the port range 20:21 for
your FTP server as this would conflict with the router’s native
FTP server assignment.
•
Service Name
: Enter a service name.
•
Port Range
: If you want to specify a Port Range for clients
on the same network, enter the Service Name, the Port
Range (e.g. 10200:10300), the LAN IP address, and leave the
Local Port empty. Port range accepts various formats such
as Port Range (300:350), individual ports (566,789) or Mix
(1015:1024,3021).
NOTES:
•
When your network’s firewall is disabled and you set 80 as the HTTP
server’s port range for your WAN setup, then your http server/web
server would be in conflict with the router’s web user interface.
•
A network makes use of ports in order to exchange data, with each
port assigned a port number and a specific task. For example, port 80
is used for HTTP. A specific port can only be used by one application
or service at a time. Hence, two PCs attempting to access data
through the same port at the same time would fail. For example, you
cannot set up Port Forwarding for port 100 for two PCs at the same
time.
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•
Local IP
: Key in the client’s LAN IP address.
NOTE
: Use a static IP address for the local client to make port forwarding
work properly. Refer to section
4.2 LAN
for information.
•
Local Port
: Enter a specific port to receive forwarded packets.
Leave this field blank if you want the incoming packets to be
redirected to the specified port range.
•
Protocol
: Select the protocol. If you are unsure, select
BOTH
.
To check if Port Forwarding has been configured successfully:
•
Ensure that your server or application is set up and running.
•
You will need a client outside your LAN but has Internet
access (referred to as “Internet client”). This client should not
be connected to the ASUS router.
•
On the Internet client, use the router’s WAN IP to access the
server. If port forwarding has been successful, you should be
able to access the files or applications.
Differences between port trigger and port forwarding:
•
Port triggering will work even without setting up a specific
LAN IP address. Unlike port forwarding, which requires a
static LAN IP address, port triggering allows dynamic port
forwarding using the router. Predetermined port ranges are
configured to accept incoming connections for a limited
period of time. Port triggering allows multiple computers
to run applications that would normally require manually
forwarding the same ports to each PC on the network.
•
Port triggering is more secure than port forwarding since the
incoming ports are not open all the time. They are opened
only when an application is making an outgoing connection
through the trigger port.
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4.3.5 DMZ
Virtual DMZ exposes one client to the Internet, allowing this
client to receive all inbound packets directed to your Local Area
Network.
Inbound traffic from the Internet is usually discarded and routed
to a specific client only if port forwarding or a port trigger has
been configured on the network. In a DMZ configuration, one
network client receives all inbound packets.
Setting up DMZ on a network is useful when you need incoming
ports open or you want to host a domain, web, or e-mail server.
Caution:
Opening all the ports on a client to the Internet makes the
network vulnerable to outside attacks. Please be aware of the security
risks involved in using DMZ.
To set up DMZ:
1.
From the navigation panel, go to
Advanced Settings
>
WAN
>
DMZ
tab.
2.
Configure the setting below. When done, click
Apply
.
•
IP address of Exposed Station:
Key in the client’s LAN IP
address that will provide the DMZ service and be exposed
on the Internet. Ensure that the server client has a static IP
address.
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To remove DMZ:
1.
Delete the client’s LAN IP address from the
IP Address of
Exposed Station
text box.
2.
When done, click
Apply
.
4.3.6 DDNS
Setting up DDNS (Dynamic DNS) allows you to access the router
from outside your network through the provided ASUS DDNS
Service or another DDNS service.
To set up DDNS:
1.
From the navigation panel, go to
Advanced Settings
>
WAN
>
DDNS
tab.
2.
Configure the following settings below. When done, click
Apply
.
•
Enable the DDNS Client
: Enable DDNS to access the ASUS
router via the DNS name rather than WAN IP address.
•
Server and Host Name
: Choose ASUS DDNS or other DDNS.
If you want to use ASUS DDNS, fill in the Host Name in the
format of xxx.asuscomm.com (xxx is your host name).
•
If you want to use a different DDNS service, click FREE TRIAL
and register online first. Fill in the User Name or E-mail
Address and Password or DDNS Key fields.

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