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5.2.6.
NAT (
Network address translations
)
NAT (Network address translations) solve the problem if sharing a single IP
address to multiple computers. Without NAT, all computers must be assigned
with a valid Internet IP address to get connected to Internet, but Internet service
providers only provide very few IP addresses to every user. Therefore it’s
necessary to use NAT technology to share a single Internet IP address to
multiple computers on local network, so everyone can get connected to Internet.
Please follow the following instructions to set NAT parameters:
5.2.6.1. Port Forwarding
The Port Forwarding allows you to re-direct a particular range of service port
numbers (from the Internet) to a particular LAN IP address. It helps you to host
some servers behind the router NAT firewall.
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73
Parameter
Description
Port Forwarding
Check this item to enable or disable the port-forwarding
feature.
Protocol
This is the protocol type to be forwarded. You can
choose to forward “TCP” or “UDP” packets only or select
“Both” to forward both “TCP” and “UDP” packets.
Comment
Enter the comment for the setting.
Enable
Check this item to enable this entry.
Local IP Address
IP address of your local server that will be accessed by
Internet.
Local IP Port
The destination port number that is made open for this
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application on the LAN side.
Remote IP Address
The source IP address from which the incoming traffic is
allowed. Leave blank for all.
Public Port
The destination port number that is made open for this
application on the WAN side
Interface
Select the WAN interface on which the port-forwarding
rule is to be applied.
Current Port
Forwarding Table
If you want to remove the port forwarding settings from
the table, select the items and then click "Delete
Selected". If you want remove all settings, just click
"Delete All" button.
When you finish, click ‘Apply Changes’. You’ll see the following message
displayed on web browser:
Press ‘Continue’ to save the settings made and back to web management
interface; press ‘Apply’ to save the settings made and restart the router so the
settings will take effect after it reboots.
5.2.6.2. Port Mapping
The router provides multiple interface groups. Up to five interface groups are
supported including one default group. The LAN and WAN interfaces could be
included. Traffic coming from one interface of a group can only be flowed to the
interfaces in the same interface group. Thus, the router can isolate traffic from
group to group for some application. By default, all the interfaces (LAN and WAN)
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belong to the default group, and the other four groups are all empty. It is possible
to assign any interface to any group but only one group.
Parameter
Description
Disabled/ Enabled
Click the radio button to enable or disable the feature. If
disabled, all interfaces belong to the default group.
Interface groups
To manipulate a mapping group:
1. Select a group from the table.
2. Select interfaces from the available/grouped interface
list and add it to the grouped/available interface list using
the arrow buttons to manipulate the required mapping of
the ports.
3. Click “Apply Changes” button to save the changes.
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When you finish, click ‘Apply Changes’. You’ll see the following message
displayed on web browser:
Press ‘Continue’ to save the settings made and back to web management
interface; press ‘Apply’ to save the settings made and restart the router so the
settings will take effect after it reboots.
5.2.6.3. UPNP
When the UPnP function is enabled, the router can be detected by UPnP
compliant system such as Windows XP. The router will be displayed in the
Neighborhood of Windows XP, so you can directly double click the router or right
click the router and select “Invoke” to configure the router through web browser.
Parameter
Description
UPnP
Enable or disable UPnP feature.
WAN Interface
The upstream WAN interface is selected here. Select
WAN interface that will use UPnP from the drop-down
lists.

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