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Page 66 / 90 Scroll up to view Page 61 - 65
Wireless Cable Modem Gateway CGD24G User Manual
5-4
Customizing Your Network
v1.1, May 2009
•
To deselect a PC from the MAC Filter List, select the PC from the drop-down list, and
then clear its
Enable
check box. Doing so leaves the PC in the MAC Filter List but
ensures that the PC is not blocked.
•
To remove a PC from the MAC Filter List, select the PC from the drop-down list, and then
click
Delete
.
4.
Select the days and times that a selected PC will be blocked:
a.
Day(s) to Block
. Select the days on which the PC that is selected in the MAC Filter List
will be blocked. The default is Everyday.
b.
Time of Day to Block
. Select a start time and an end time to specify a period during
which the PC that is selected in the MAC Filter List will be blocked. The default is All
Day. Be sure that you deselect the
All Day
check box if you want to enter specific times.
The selected period applies to each day that you selected in the previous step.
5.
Click
Add
to save your settings.
6.
Repeat
step 2
through
step 5
for all PCs that you want to block.
Configuring Port Triggering
Port triggering is an advanced feature that can be used to easily enable gaming and other Internet
applications that would otherwise be blocked by the firewall. Using this feature requires that you
know the port numbers that are used by the application.
Port triggering is an advanced feature that can be used to easily enable gaming and other Internet
applications that would otherwise be blocked by the firewall. Using this feature requires that you
know the port numbers that are used by the application.
Once configured, port triggering operation is as follows:
1.
A PC makes an outgoing connection using a port number defined in the Port Triggering table.
2.
The gateway records this connection, opens the incoming port or ports associated with this
entry in the Port Triggering List, and associates them with the PC.
3.
The remote system receives the PCs request, and responds using a different port number.
Note:
For information about port forwarding and port blocking, see
“Firewall Rules—Port Forwarding and Port Blocking” on page 3-5
.
Page 67 / 90
Wireless Cable Modem Gateway CGD24G User Manual
Customizing Your Network
5-5
v1.1, May 2009
4.
The gateway matches the response to the previous request, and forwards the response to the
PC. (Without port triggering, this response would be treated as a new connection request rather
than a response. As such, it would be handled in accordance with the port forwarding rules.)
To configure port triggering:
1.
In the main menu, under Advanced, select Port Triggering. The Port Triggering screen
displays.
2.
For each port trigger that you would like to enable, enter the following settings in the Port
Trigger List and enable the port trigger:
•
Trigger Range
. The trigger range consists of the range of outgoing ports that will be
monitored to trigger the incoming port forwarding rule:
–
Start Port
. Enter the start port for the trigger range.
Note:
Only one PC can use a port triggering application at any time. After a PC has
finished using a port triggering application, there is a short time-out period before
the application can be used by another PC.
Figure 5-3
Page 68 / 90
Wireless Cable Modem Gateway CGD24G User Manual
5-6
Customizing Your Network
v1.1, May 2009
–
End Port
. Enter the start port for the trigger range.
•
Target Range
. The target range consists of the range of incoming ports that will be
opened when triggered:
–
Start Port
. Enter the start port for the target range.
–
End Port
. Enter the start port for the target range.
•
Protocol
. Select the protocol for the ports,:
–
TCP
. Select TCP only.
–
UDP
. Select UDP only.
–
Both
. Select both TCP and UDP.
•
Select the
Enable
check box to activate the port trigger.
3.
Perform one of the following actions:
•
Click
Apply
to save your settings and activate the port triggers that you have enabled in
step 2
.
•
Click
Delete
to remove a port trigger that you can select by clicking the radio box next to
the port trigger that you want to delete.
•
Click
Reset
to return all trigger and target ranges to their default values of zero.
Setting Up a DMZ Host
You can use the DMZ Host screen to set the gateway to respond to a ping and specify a DMZ
address. To configure a default DMZ host:
1.
In the main menu, under Advanced, select DMZ Host. The DMZ Host screen displays.
Figure 5-4
Page 69 / 90
Wireless Cable Modem Gateway CGD24G User Manual
Customizing Your Network
5-7
v1.1, May 2009
2.
If you want the gateway to respond to a ping from the Internet, select the
Respond to Ping on
WAN
check box. Responding to pings can be useful in a diagnostic situation.
3.
Complete the DMZ IP address in the DMZ Address field to designate a PC that is available to
anyone on the Internet for services that you have not defined. Because of security concerns,
only do this if you are willing to risk open access. If you do not assign a DMZ address, the
gateway discards any undefined service request.
4.
Click
Apply
to save your settings.
LAN IP Settings
The LAN IP screen allows you to configure LAN IP services such as the IP address of the gateway
and DHCP. The TCP/IP and DHCP default values work fine in most cases.
To configure LAN IP settings:
1.
In the main menu, under Advanced, select LAN IP. The LAN IP screen displays.
Figure 5-5
Page 70 / 90
Wireless Cable Modem Gateway CGD24G User Manual
5-8
Customizing Your Network
v1.1, May 2009
2.
Enter the following LAN IP settings:
•
LAN IP Address
. Enter the LAN IP address that you would like to assign for your
gateway in dotted decimal notation. The factory default settings is 192.168.0.1.
•
Subnet Mask
. Enter the network number portion of an IP address. Unless you are
implementing subnetting, use 255.255.255.0 as the subnet mask.
•
DHCP Server
. The gateway is set up by default as a Dynamic Host Configuration
Protocol (DHCP) server, which provides the TCP/IP configuration for all the computers
that are connected to the gateway. You can change the default setting.
–
Yes
. Select this settings to enable the DHCP server on the gateway and assign IP
addresses to computers on your LAN automatically.
–
No
. Select this settings to assign IP addresses manually, or if you have another DHCP
server on your network.
•
Starting IP Address
. Complete the first of the contiguous addresses in the IP address
pool. 192.168.0.10 is the default start address.
•
Ending IP Address
. Complete the last of the contiguous addresses in the IP address pool.
192.168.0.19 is the default end address.
3.
Click
Apply
to save your LAN IP settings.
Reserving an IP Address for DHCP Use
To reserve an IP address for DHCP use, enter the DHCP server reservation settings for the private
LAN under DHCP Reservation Lease Info in the LAN IP screen:
1.
Enter the MAC address of the PC for which you want to reserve an IP address.
2.
Enter the permanent IP address for the PC.
3.
Click
Add
to save your settings.
The MAC address and IP address are displayed in the DHCP Client Lease Info table. The current
system time is also displayed.
Note:
If you disable the DHCP server, you will need to assign to your PC a
static IP address to reconnect to the gateway and enable the DHCP
server again.

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