56

To enable a feature:

1

Click the appropriate check box (a check mark will appear).

2

When you are done with your selections, click on the

Apply

button.

Table 8. Options Menu Option

Option

Description

WAN Blocking

Prevents the Cable Modem/Router or the PCs from responding to

pings to the Cable Modem/Router’s WAN IP address or to the

devices behind it. This makes it more difficult for hackers to attack

your PCs and other devices on your network.

IPSec/PPTP

PassThrough

Enable to support VPN devices or software on your network.

Remote

Configuration

Management

Allows the Cable Modem/Router to be remotely administered at

port 8080. When enabled, navigate to http://CMIPAddress:8080/ to

administer the Cable Modem/Router remotely). You can find your

CM: WAN IP address on the

Basic Setup

page.

Multicast

Enable

Allows multicast specific traffic (denoted by a multicast specific

address) to be passed to and from the PCs on the private network

behind the Cable Modem/Router.

UPnP Enable

Select Enable to enable the UPnP agent in the Cable

Modem/Router. If you are running an application that requires

UPnP, check this box.

Primary

Network

Bridged

Allows all LAN hosts to bypass NAT and the Cable Modem/Router's

LAN DHCP Server. Adding MAC addresses into the table is not

required. If MAC addresses are added to the table then only those

MAC addresses in the list will bypass NAT and the LAN DHCP. All

other LAN hosts NOT in the list will use the

NAT and LAN DHCP

Server as normal.

NAT ALG

Status

The NAT ALG section shows which ALGs (Application Layer

Gateway) are allowed to pass through the NAT Firewall.

Most

users will not need to change these settings.

57

IP Filtering

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

network devices on your LAN from accessing the Internet. By entering starting and

ending IP address ranges, you can configure which local PCs are denied access to the

WAN.

We recommend assigning a static IP address to your computer when using IP Filtering.

By default, the Cable Modem/Router uses DHCP to assign IP addresses. DHCP does

not guarantee that your computer will be assigned the same IP address. When assigning

a static IP address to your computer you should select an address that is outside the IP

addresses assigned by the Cable Modem/Router’s DHCP server.

By default the DHCP

Server assigns addresses from 192.168.0.10 to 192.168.0.255.

We recommend using

192.168.0.6 as the static IP address for your computer.

To access the

IP Filtering

page:

1

Click

Advanced

in the menu bar.

2

Then click the

IP Filtering

submenu.

Figure 14 shows an example of the menu and Table 9 describes the items you can

select.

Figure 14. Example of IP Filtering Page

58

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 9. 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 15 shows an example of the menu and Table 10 describes the items you can

select.

59

Figure 15. Example of MAC Filtering Page

Table 10. 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

.

60

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

select.

Figure 16. Example of Port Filtering Page