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Page 81 / 114 Scroll up to view Page 76 - 80
Advanced Settings
81
N300 Wireless Gigabit Router WNR3500Lv2
3.
Click the
Add Custom Service
button to display the following screen:
4.
In the Service Name field, enter a descriptive name.
5.
In the Protoco
l
list, select the protocol. If you are unsure, select
TCP/UDP
.
6.
In the Starting Port field, enter the beginning port number.
•
If the application uses a single port, enter the same port number in the Ending Port
field.
•
If the application uses a range of ports, enter the ending port number of the range in
the Ending Port field.
7.
In the Server IP Address field, enter the IP address of your local computer that will provide
this service.
8.
Click
Apply
. The service appears in the list in the Port Forwarding/Port Triggering screen.
Editing or Deleting a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
In the table, select the radio button next to the service name.
2.
Click
Edit Service
or
Delete Service
.
Application Example: Making a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web
requests from anyone on the Internet to reach your web server.
To make a local web server public:
1.
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation. In this example, your router will always give your web server an IP
address of 192.168.1.33.
Page 82 / 114
Advanced Settings
82
N300 Wireless Gigabit Router WNR3500Lv2
2.
In the Port Forwarding screen, configure the router to forward the HTTP service to the local
address of your web server at
192.168.1.33
. HTTP (port 80) is the standard protocol for web
servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your router to
use the name as described in
Dynamic DNS
on page 84. To access your web server from
the Internet, a remote user has to know the IP address that has been assigned by your ISP.
However, if you use a Dynamic DNS service, the remote user can reach your server by a
user-friendly Internet name, such as mynetgear.dyndns.org.
Set Up Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
•
More than one local computer needs port forwarding for the same application (but not
simultaneously).
•
An application needs to open incoming ports that are different from the outgoing port.
When port triggering is enabled, the router monitors outbound traffic looking for a specified
outbound “trigger” port. When the router detects outbound traffic on that port, it remembers
the IP address of the local computer that sent the data. The router then temporarily opens the
specified incoming port or ports, and forwards incoming traffic on the triggered ports to the
triggering computer.
While port forwarding creates a static mapping of a port number or range to a single local
computer, port triggering can dynamically open ports to any computer that needs them and
can close the ports when they are no longer needed.
Note:
If you use applications such as multiplayer gaming, peer-to-peer
connections, real-time communications such as instant messaging,
or remote assistance (a feature in Windows XP), you should also
enable Universal Plug and Play (UPnP) according to the instructions
in
Universal Plug and Play
on page 89.
To set up port triggering, you need to know which inbound ports the application needs. Also,
you need to know the number of the outbound port that will trigger the opening of the inbound
ports. You can usually determine this information by contacting the publisher of the
application or user groups or newsgroups.
To set up port triggering:
1.
Select
Advanced >Advancec Setup > Port Forwarding/Port Triggering
.
Page 83 / 114
Advanced Settings
83
N300 Wireless Gigabit Router WNR3500Lv2
2.
Select the
Port Triggering
radio button to display the port triggering information.
3.
Clear the
Disable Port Triggering
check box if it is selected.
Note:
If the Disable Port Triggering check box is selected after you configure
port triggering, port triggering is disabled. However, any port triggering
configuration information you added to the router is retained even though it is
not used.
4.
In the Port Triggering Timeout field, enter a value up to 9999 minutes.
5.
This value controls the inactivity timer for the designated inbound ports. The inbound ports
close when the inactivity time expires. This is required because the router cannot be sure
when the application has terminated.
Page 84 / 114
Advanced Settings
84
N300 Wireless Gigabit Router WNR3500Lv2
6.
Click
Add Service
to display the following screen:
7.
In the Service Name field, type a descriptive service name.
8.
In the Service User list, select
Any
(the default) to allow this service to be used by any
computer on the Internet. Otherwise, select
Single address
, and enter the IP address of
one computer to restrict the service to a particular computer.
9.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
10.
In the Triggering Port field, enter the number of the outbound traffic port that will cause the
inbound ports to be opened.
11.
Enter the inbound connection port information in the Connection Type, Starting Port, and
Ending Port fields.
12.
Click
Apply
. The service appears in the Port Triggering Portmap table.
Dynamic DNS
If your Internet service provider (ISP) gave you a permanently assigned IP address, you can
register a domain name and have that name linked with your IP address by public Domain
Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP
address, you do not know in advance what your IP address will be, and the address can
change frequently. In this case, you can use a commercial Dynamic DNS service. This type
of service lets you register your domain to their IP address and forwards traffic directed at
your domain to your frequently changing IP address.
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x), the Dynamic
DNS service will not work because private addresses are not routed on the Internet.
Your router contains a client that can connect to the Dynamic DNS service provided by
DynDNS.org. First visit their website at
and obtain an account and
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Advanced Settings
85
N300 Wireless Gigabit Router WNR3500Lv2
host name that you configure in the router. Then, whenever your ISP-assigned IP address
changes, your router automatically contacts the Dynamic DNS service provider, logs in to
your account, and registers your new IP address. If your host name is hostname, for
example, you can reach your router at
.
On the Advanced tab, select
Advanced Setup > Dynamic DNS
to display the following
screen:
Figure 9. Forward traffic to a changing IP address
To set up Dynamic DNS:
1.
Register for an account with one of the Dynamic DNS service providers whose names
appear in the Service Provider list. For example, for DynDNS.org, select
www.dyndns.org
.
2.
Select the
Use a Dynamic DNS Service
check box.
3.
Select the name of your Dynamic DNS service provider.
4.
Type the host name (or domain name) that your Dynamic DNS service provider gave you.
5.
Type the user name for your Dynamic DNS account. This is the name that you use to log in
to your account, not your host name.
6.
Type the password (or key) for your Dynamic DNS account.
7.
If your Dynamic DNS provider allows the use of wildcards in resolving your URL, you can
select the
Use Wildcards
check box to activate this feature.
For example, the wildcard feature causes
*.yourhost.dyndns.org
to be aliased to the
same IP address as yourhost.dyndns.org.
8.
Click
Apply
to save your configuration.

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