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Page 61 / 74 Scroll up to view Page 56 - 60
Gateway Configuration Screen Definitions
SURFboard® SBG6580 Wireless Cable Modem Gateway
•
User Guide
50
365-095-25397-x.1
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 44 – 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.
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
Page 62 / 74
Gateway Configuration Screen Definitions
SURFboard® SBG6580 Wireless Cable Modem Gateway
•
User Guide
51
365-095-25397-x.1
Figure 45 – 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.
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 46 – Advanced Create Port Triggers Screen
Page 63 / 74
Gateway Configuration Screen Definitions
SURFboard® SBG6580 Wireless Cable Modem Gateway
•
User Guide
52
365-095-25397-x.1
Figure 47 – 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
Available protocols:
TCP
,
UDP
, or
BOTH
Description
Name to identify the port trigger.
Enabled
Lets you turn
On
or
Off
the selected IP port triggers.
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, and mail servers, for example; 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.
Page 64 / 74
Gateway Configuration Screen Definitions
SURFboard® SBG6580 Wireless Cable Modem Gateway
•
User Guide
53
365-095-25397-x.1
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 48 – Commonly Used Port Forwarding Port Numbers List
Figure 49 – Advanced Create Port Forwarding Screen
Figure 50 – Advanced Port Forwarding Screen
Page 65 / 74
Gateway Configuration Screen Definitions
SURFboard® SBG6580 Wireless Cable Modem Gateway
•
User Guide
54
365-095-25397-x.1
Table 16: Advanced Port Forwarding-Field Descriptions
Field
Description
External IP Address &
Start/End Port
The range of ports that you want to allow for incoming
traffic to be forwarded from a remote IP address.
Local IP Address &
Start/End Port
The range of ports that you want to allow for incoming
traffic to be forwarded from a local IP address.
Description
Name to identify the port trigger.
Protocol
Available protocols:
TCP
,
UDP
, or
BOTH
Enabled
Lets you turn
On
or
Off
port forwarding.
DMZ Host
You can configure one computer on your home network as the DMZ Host. That computer will operate
outside of the SBG6580 firewall. This feature allows you to set up a separate subnetwork for remote
access from the Internet to your computer, gaming devices, or other IP-enabled device so that your
home network is not exposed to hackers or other external attacks from the Internet. Outside users will
only have direct access to the designated DMZ Host device and not your home network.
If you set up a computer as the DMZ Host, remember to set the IP address back to zero (0) when you are
finished with the needed application, since this computer will be exposed to the Internet. Although the
computer is protected from Denial of Service (DoS) attacks via the SBG6580 firewall, it is still exposed to
the Internet.
Figure 51 – Advanced DMZ Host Screen
Table 17: Advanced DMZ Host-Field Descriptions
Field
Description
DMZ Host
Enter the IP address of the selected computer you are
setting up as the DMZ host.

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