71

To activate the IP address filter:

1

Enter the last byte (the numbers after the last period) of the IP address in

Start

Address

and

End Address

.

2

Check the

Enable

box to the right of the entry to store settings.

3

Click the

Apply

button to activate the filter rules.

Table 11. IP Filtering Menu Option

Option

Description

Start/End

Address

Enter the last byte of the IP address. The upper bytes of the IP

address are set automatically from the Cable Modem/Router IP

address.

Enable

To activate the IP address filter, you must also check the

Enable

box

and click

Apply

. You can disable this filter while retaining the

addresses you entered for later use.

MAC Filtering

The MAC Filtering page allows you to configure MAC address filters in order to block

Internet traffic to specific network devices on your LAN.

To access the

MAC Filtering

page:

1

Click

Advanced

in the menu bar.

2

Then click the

MAC Filtering

submenu.

Figure 18 shows an example of the menu and Table 10 describes the items you can

select.

72

Figure 18. Example of MAC Filtering Page

Table 12. MAC Filtering Menu Option

Option

Description

MAC Address

PCs and other devices can be added to the MAC filter table by

entering their MAC addresses into the

Add MAC Address

box, and

clicking the

Add MAC Address

button. Internet traffic to and from

each listed Address will be blocked.

The Mac Addresses of the computers attached to your network can

be found in the

DHCP Clients

table.

To access the

DHCP Clients

table click on

Basic

on the menu bar then

DHCP

.

73

Port Filtering

The Port Filtering page allows you to configure port filters in order to block Internet traffic

to specific ports on all devices on your LAN.

Similarly, you can prevent PCs from sending outgoing TCP/UDP traffic to the Internet

from specific IP port numbers. This can be configured using the Port Filtering page.

To access the

Port Filtering

page:

1

Click

Advanced

in the menu bar.

2

Then click the

Port Filtering

submenu.

Figure 19 shows an example of the menu and Table 11 describes the items you can

select.

Figure 19. Example of Port Filtering Page

74

For example

, if you would like to block all PCs on the private LAN from accessing HTTP

sites (or “web surfing”):

1

Set the Start Port to

80

, the End Port to

80

.

2

Set the protocol to

TCP

.

3

Check the

Enable

box to the right of the entry to store settings.

4

Click

Apply

button to activate the filter rules.

Table 13. Port Filtering Menu Option

Option

Description

Start/End Port

Enters the start and end port of the port filter range

Protocol

Filter either both TCP and UDP traffic or just UDP or just TCP.

Forwarding

The Forwarding page allows you to run a publicly accessible server from your LAN by

specifying the mapping of TCP/UDP ports to a local PC. It allows incoming requests to

specific port numbers to reach a web server, FTP server, mail server, etc.

To access the

Forwarding

page,

1

Click

Advanced

in the menu bar.

2

Then click the

Forwarding

submenu.

3

To add a new IPv4 rule, click on the

Create IPv4 Rule

button, to add a new IPv6 rule

click on the

Create IPv6 Rule

.

Most users should select Create IPv4 rule unless

your LAN network is using IPv6.

Figure 20 shows an example of the menu and Table 12 describes the items you can

select.

75

Figure 20. Example of Forwarding Page

To activate the port forwarding:

1

Enter the port range of the Internet traffic that you want to forward, and the IP

address of the server to which you want to forward that traffic.

2

Select the protocol(s) to be forwarded.

3

Check the

Enable

box to the bottom of the entry to store settings.

4

Click the

Apply

button to activate the forwarding rules.

Table 14. Forwarding Menu Option

Option

Description

External IP

Address

Enter the External IP address of the device that you want to allow

access to your network. If you do not know the address you can

leave this field blank.

Note:

The External IP Address is not the CM

WAN IP address shown on the status page. It is the address of the

remote device.

External

Start/End Port

Enter the range of port numbers (start and end port) from the

external device that you want to allow onto your network.

If you do

not know the address you can leave this field blank

Local IP

Enter the IP address to which forwarded traffic should be sent. If you