Gateway Configuration Screen Definitions

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MAC Filtering

MAC filtering allows you to define up to twenty Media Access Control (MAC) address filters to prevent

computers from sending outgoing TCP/UDP traffic to the WAN via their MAC addresses. This is useful

because the MAC address of a specific NIC card never changes, unlike its IP address, which can be

assigned via the DHCP server or hard-coded to various addresses over time.

Figure 51 – Advanced MAC Filtering Screen

Table 13: Advanced MAC Filtering -Field Descriptions

Field

Description

Add MAC

Address

Enter the MAC address for the computer you want to

block and click

Add MAC Address

button.

Repeat for up to 20 MAC addresses.

Remove MAC Address

Enter the MAC address filter that you want to delete

block and click

Remove MAC Address

button.

Clear All button

Deletes all of your MAC Address filters.

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Port Filtering

Port filtering allows you to define port filters to prevent all devices from sending outgoing TCP/UDP

traffic to the WAN on specific IP port numbers. By specifying a starting and ending port range, you can

determine what TCP/UDP traffic is allowed out to the WAN on a per-port basis.

Note

: The specified port ranges are blocked for ALL computers, and this setting is not IP address or MAC

address specific. For example, if you wanted to block all computers on your home network from accessing

HTTP sites (or web surfing), you would create the following port filter and then click

Apply

when done:

•

Set

Start Port

to

80

•

Set

End Port

to

80

•

Set

Protocol

to

TCP

•

Select

Enabled

Figure 52 – Advanced Port Filtering Screen

Table 14: Advanced Port Filtering -Field Descriptions

Field

Description

Start Port

The starting port number of the Port Filtering range.

End Port

The ending port number of the Port Filtering range.

Protocol

Select

TCP

,

UDP

, or

BOTH

from the drop-down list.

Enabled

Select to activate or deselect to deactivate the selected

IP port triggers.

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Port Triggers

You can use Port Triggers to configure dynamic triggers to specific devices on the LAN. This allows

special applications that require specific port numbers with bi-directional traffic to function properly.

Applications such as video conferencing, voice, gaming, and some messaging program features may

require these special settings.

Figure 53 – Advanced Create Port Triggers Screen

Figure 54 – Advanced Port Triggers Screen

Table 15: Advanced Port Triggers -Field Descriptions

Field

Description

Trigger Start Port

The starting port number of the Port Trigger range.

Trigger End Port

The ending port number of the Port Trigger range.

Target Start Port

The starting port number of the Port Target range.

Target End Port

The ending port number of the Port Target range.

Protocol

Select

TCP

,

UDP

, or

BOTH

from the drop-down list.

Description

Name the port trigger.

Enabled

Select

On

or

Off

to activate or deactivate the selected IP

port triggers.

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Port Forwarding

Port forwarding allows you to run a publicly accessible server on your home network by specifying the

mapping of TCP/UDP ports to a local computer. This enables incoming requests on specific port

numbers to reach web servers, FTP servers, mail servers, etc. so that they can be accessible from the

Internet.

To map a port, you must enter the range of port numbers that want forwarded locally and the IP

address to which traffic to those ports should be sent. If you only want a single port specification, enter

the same port number in the start and end locations for that IP address.

A table of commonly used port numbers is also displayed on the page for your convenience. These are

some of the ports used by common applications:

Figure 55 – Commonly Used Port Forwarding Port Numbers List

Gateway Configuration Screen Definitions

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Figure 56 – Advanced Port Forwarding Screen

Table 16: Advanced Port Forwarding-Field Descriptions

Field

Description

External IP Address

& Start/End Port

Single port: Remote IP address and a specific port number (enter the

same port number in the Start and End Port fields).

Range of ports: Remote IP address and a specific range of port numbers

(enter the first and last port numbers of the desired port range in the

Start and End Port fields).

Local IP Address &

Start/End Port

Single port: IP address of the local computer or device and a specific port

number (enter the same port number in the Start and End Port fields).

Range of ports: IP address of the local computer or device and a specific

range of port numbers (enter the first and last port numbers of the

desired port range in the Start and End Port fields).

Description

Name of the forwarded port.

Protocol

Select

TCP

,

UDP

, or

Both

for the Internet protocol.

Enabled

Select

On

or

Off

to enable or disable port forwarding on the selected

port(s).

Commonly

Forwarded Ports

List of port numbers used by common applications.