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Gateway Configuration Screen Definitions
SURFboard® SBG6700-AC Wireless Cable Modem Gateway
•
User Guide
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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 51 – 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.
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Gateway Configuration Screen Definitions
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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
Figure 52 – 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.
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Gateway Configuration Screen Definitions
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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 53 – Advanced Create Port Triggers Screen
Figure 54 – 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
Select
TCP
,
UDP
, or
BOTH
from the drop-down list.
Description
Name the port trigger.
Enabled
Select
On
or
Off
to activate or deactivate the selected IP
port triggers.
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Gateway Configuration Screen Definitions
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User Guide
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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, mail servers, etc. 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.
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 55 – Commonly Used Port Forwarding Port Numbers List
Page 75 / 86
Gateway Configuration Screen Definitions
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User Guide
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Figure 56 – Advanced Port Forwarding Screen
Table 16: Advanced Port Forwarding-Field Descriptions
Field
Description
External IP Address
& Start/End Port
Single port: Remote IP address and a specific port number (enter the
same port number in the Start and End Port fields).
Range of ports: Remote IP address and a specific range of port numbers
(enter the first and last port numbers of the desired port range in the
Start and End Port fields).
Local IP Address &
Start/End Port
Single port: IP address of the local computer or device and a specific port
number (enter the same port number in the Start and End Port fields).
Range of ports: IP address of the local computer or device and a specific
range of port numbers (enter the first and last port numbers of the
desired port range in the Start and End Port fields).
Description
Name of the forwarded port.
Protocol
Select
TCP
,
UDP
, or
Both
for the Internet protocol.
Enabled
Select
On
or
Off
to enable or disable port forwarding on the selected
port(s).
Commonly
Forwarded Ports
List of port numbers used by common applications.
19216811.live