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Page 96 / 126 Scroll up to view Page 91 - 95
Advanced Settings
96
N900 Wireless Dual Band Gigabit Router R4500
Port forwarding creates a static mapping of a port number or range to a single local computer.
Port triggering dynamically opens ports to any computer on the LAN and closes 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 102.
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 > Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select the
Port Triggering
radio button.
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.
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Advanced Settings
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N900 Wireless Dual Band Gigabit Router R4500
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
determine when the application has terminated.
5.
Click
Add Service
:
6.
In the Service Name field, type a descriptive service name.
7.
In the Service User list, select one of the following:
•
Any
(the default) to allow any computer on the Internet to use this service.
•
Single address
, and enter the IP address of one computer to restrict the service to a
particular computer.
8.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
9.
In the Triggering Port field, enter the number of the outbound traffic port that will cause the
inbound ports to be opened.
10.
Enter the inbound connection port information in the Connection Type, Starting Port, and
Ending Port fields.
11.
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
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Advanced Settings
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N900 Wireless Dual Band Gigabit Router R4500
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 does 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
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 http://hostname.dyndns.org.
To set up Dynamic DNS:
1.
On the Advanced tab, select
Advanced Setup > Dynamic DNS
:
2.
Register for an account with one of the Dynamic DNS service providers whose web
addresses are in the Service Provider list.
3.
Select the
Use a Dynamic DNS Service
check box.
4.
Select the URL of your Dynamic DNS service provider.
For example, for DynDNS.org, select
www.dyndns.org
.
5.
Type the host name (or domain name) that your Dynamic DNS service provider gave you.
6.
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.
7.
Type the password (or key) for your Dynamic DNS account.
8.
Click
Apply
to save your configuration.
Page 99 / 126
Advanced Settings
99
N900 Wireless Dual Band Gigabit Router R4500
Static Routes
Static routes provide more routing information to your router. Under usual circumstances, the
router has enough routing information after it has been configured for Internet access, and
you do not need to add static routes. You need to add static routes only in unusual cases
such as multiple routers or multiple IP subnets on your network.
As an example of when a static route is needed, consider the following case:
•
Your primary Internet access is through a cable modem to an ISP.
•
You have an ISDN router on your home network for connecting to the company where
you are employed. This router’s address on your LAN is 192.168.1.100.
•
Your company’s network address is 134.177.0.0.
When you first configured your router, two implicit static routes were created. A default route
was created with your ISP as the gateway, and a second static route was created to your
local network for all 192.168.1.x addresses. With this configuration, if you attempt to access a
device on the 134.177.0.0 network, your router forwards your request to the ISP. The ISP
forwards your request to the company where you are employed, and the request is likely to
be denied by the company’s firewall.
In this case you have to define a static route, telling your router that 134.177.0.0 should be
accessed through the ISDN router at 192.168.1.100. In this example:
•
The Destination IP Address and IP Subnet Mask fields specify that this static route
applies to all 134.177.x.x addresses.
•
The Gateway IP Address field specifies that all traffic for these addresses should be
forwarded to the ISDN router at 192.168.1.100.
•
A metric value of 1 works since the ISDN router is on the LAN.
•
Private is selected only as a precautionary security measure in case RIP is activated.
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Advanced Settings
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N900 Wireless Dual Band Gigabit Router R4500
To set up a static route:
1.
Select
Advanced > Advanced Setup > Static Routes
, and click
Add
:
2.
In the Route Name field, type a name for this static route (for identification purposes only.)
3.
Select the
Private
check box if you want to limit access to the LAN only.
If Private is selected, the static route is not reported in RIP.
4.
Select the
Active
check box to make this route effective.
5.
Type the IP address of the final destination.
6.
Type the IP subnet mask for this destination. If the destination is a single host, type
255.255.255.255
.
7.
Type the gateway IP address, which has to be a router on the same LAN segment as the
router.
8.
Type a number from 1 through 15 as the metric value.
This value represents the number of routers between your network and the destination.
Usually, a setting of 2 or 3 works, but if this is a direct connection, set it to 1.
9.
Click
Apply
to add the static route.

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