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Page 51 / 110 Scroll up to view Page 46 - 50
4028315 Rev A
51
How Do I Configure My DOCSIS Residential Gateway?
Configuring and Enabling TCP and UDP Port Filters
Use the Setup Advanced Settings - Port Filtering page to configure and enable TCP
and UDP port filters. These filters prevent a range of TCP/UDP ports from accessing
the Internet. You can also prevent PCs from sending outgoing TCP/UDP traffic to
the WAN on specific IP port numbers. This filter is not IP address- or MAC address-
specific. The system blocks the specified port ranges for all PCs.
Note:
If you are not familiar with the advanced settings detailed in this section,
contact your service provider before you attempt to change any of the residential
gateway default advanced port filtering settings.
Click
Port Filtering
in the Advanced Settings section of the Setup page to access the
Setup Advanced Settings - Port Filtering page.
Setup Advanced Settings - Port Filtering Page
The following illustration is an example of the Setup Advanced Settings - Port
Filtering page.
Setup Advanced Settings - Port Filtering Page Description
Use this link to enter and enable the desired port filtering ranges and protocols in the
appropriate fields and then click
Apply
to apply and save your new port filtering
settings.
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4028315 Rev A
How Do I Configure My DOCSIS Residential Gateway?
Configuring Port Forwarding for Local IP Addresses
Use the Setup Advanced Settings - Port Forwarding page to configure port
forwarding for local IP addresses. Port forwarding allows you to run a server on the
LAN by specifying the mapping of TCP/UDP ports to a local PC. You must also set
up a fixed private LAN IP address for the destination device.
Note:
If you are not familiar with the advanced settings detailed in this section,
contact your service provider before you attempt to change any of the residential
gateway default advanced port forwarding settings.
Click
Port Forwarding
in the Advanced Settings section of the Setup page to access
the Setup Advanced Settings - Port Forwarding page.
Setup Advanced Settings - Port Forwarding Page
The following illustration is an example of the Setup Advanced Settings - Port
Forwarding page.
Setup Advanced Settings - Port Forwarding Page Description
The following example illustrates how to use the port forwarding feature to
configure the Microsoft X-Box Online Live for Internet gaming.
Note:
For most widely used applications (including Microsoft X-Box Online Live),
the built-in firewall automatically maps and opens ports required for that
application while the application is in use.
1
Set the device to be used for port forward to a fixed IP address, for example,
192.168.0.5
.
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How Do I Configure My DOCSIS Residential Gateway?
2
In the first entry of the Port Forwarding area of the page, enter the same IP
address (192.168.0.5) in the Local IP Address field.
3
In the same row, enter the appropriate port numbers in the Start Port and End
Port fields.
4
In the same row, select the appropriate protocol from the drop-down list in the
Protocol field, and then select the box in the
Enable
field.
5
To add additional ports, repeat steps 1 through 4, and then go to step 6.
6
Click
Apply
to apply and save your new port forwarding settings.
Configuring TCP/UDP Port Triggers
Use the Setup Advanced Settings - Port Triggers page to configure TCP/UDP port
triggers. Port triggering is similar to port forwarding but is dynamic. In other words,
the system does not hold the ports open indefinitely. For example, when the
residential gateway detects outgoing data on a specific IP port number set in the
“Trigger Range,” the resulting ports set in the “Target Range” will open for
incoming data. If the system detects no outgoing traffic on the “Trigger Range” ports
for a period of 10 minutes, the “Target Range” ports close. This is a safer method for
opening specific ports for special applications, such as, video conferencing
programs, interactive gaming, and file transfer in chat programs. This is safe because
the ports are dynamically triggered and not held open continuously or left open
erroneously by the router administrator. Therefore, these ports are not exposed and
vulnerable for potential hackers to discover.
Note:
If you are not familiar with the advanced settings detailed in this section,
contact your service provider before you attempt to change any of the residential
gateway default advanced port triggers settings.
Click
Port Triggers
in the Advanced Settings section of the Setup page to access the
Setup Advanced Settings - Port Triggers page.
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4028315 Rev A
How Do I Configure My DOCSIS Residential Gateway?
Setup Advanced Settings - Port Triggers Page
The following illustration is an example of the Setup Advanced Settings - Port
Triggers page.
Setup Advanced Settings - Port Triggers Page Description
Use this link to enter and enable the port forwarding trigger and target range start
and end ports along with protocol information in the appropriate fields. The
following example illustrates how to use the port triggering feature to configure the
Microsoft X-Box Online Live for Internet gaming.
Note:
For most widely used applications (including Microsoft X-Box Online Live),
the built-in firewall automatically maps and opens ports required for that
application while the application is in use.
1
In the first row, enter
88
in both Start Port and End Port fields.
2
In the same row, select
UDP
from the drop-down list in the Protocol field, and
then select the box in the
Enable
field.
3
In the second row, enter
3074
in both Start Port and End Port fields.
4
In the same row as the second entry, select
Both
, and then select the box in the
Enable field.
5
Click
Apply
to apply and save your new port forwarding settings.
Page 55 / 110
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How Do I Configure My DOCSIS Residential Gateway?
Configuring the DMZ Host
Use the Setup Advanced Settings - DMZ Host page to configure an IP address that is
visible to the WAN. DMZ hosting is commonly referred to as “exposed host,” and
allows you to specify the “default” recipient of WAN traffic that Network Address
Translation (NAT) is unable to translate to a known local PC. DMZ allows one IP
address to be unprotected while others remain protected.
Note:
If you are not familiar with the advanced settings detailed in this section,
contact your service provider before you attempt to change any of the residential
gateway default advanced DMZ host settings.
Click
DMZ Host
in the Advanced Settings section of the Setup page to access the
Setup Advanced Settings - DMZ Host page.
Setup Advanced Settings - DMZ Host Page
The following illustration is an example of the Setup Advanced Settings - DMZ Host
page.
Setup Advanced Settings - DMZ Host Page Description
Use this link to place a Private LAN IP device, for example, an FTP, Mail, or Web
server directly on the Internet (bypassing the firewall). You set the server with a
fixed IP address as a DMZ Host by entering its IP address in the DMZ Address field.
Make sure the IP address used is not in the range of addresses delivered by the built-
in DHCP server. After setting up a DMZ Host, all ports on this device are open to
the Internet. You may configure only one PC to be the DMZ host. DMZ is generally
used for PCs running “problem” applications that use random port numbers and do
not function correctly with the specific port triggers or port forwarding setups
described earlier in this guide. After entering a DMZ Address, click
Apply
to apply
and save your new DMZ Host setting.

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