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Page 41 / 78 Scroll up to view Page 36 - 40
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Advanced Pages • Advanced IP Filtering Page
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
33
570280-001-a
Advanced IP Filtering Page
This page allows you to define which local PCs will be denied access to the SBG941
WAN. You can configure IP address filters to block Internet traffic to specific network
devices on the LAN by entering starting and ending IP address ranges.
Note
: Only enter the LSB (Least-significant byte) of the IP address; the upper bytes of
the IP address are set automatically from the IP address for the SBG941 Configuration
Manager.
Field Descriptions for the Advanced IP Filtering Page
Field
Description
Start Address
Enter the starting IP address range of the computers for which you
want to deny access to the SBG941 WAN. Only enter the least
significant byte of the IP address.
End Address
Enter the ending IP address range of the computers you want to
deny access to the SBG941 WAN. Only enter the least significant
byte of the IP address.
Enabled
Activates the IP address filter, when selected.
Select
Enabled
for each range of IP addresses you want to deny
access to the SBG941 WAN.
When done, click
Apply
to activate and save your settings.
Page 42 / 78
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Advanced Pages • Advanced MAC Filtering Page
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
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570280-001-a
Advanced MAC Filtering Page
This page allows you to define up to twenty Media Access Control (MAC) address filters
to prevent PCs 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.
Field Descriptions for the Advanced MAC Filtering Page
Field
Description
MAC Addresses
Media Access Control address — a unique set of 12 hexadecimal digits
assigned to a PC during manufacturing.
Setting a MAC Address Filter
1.
Enter the MAC address in the MAC Addresses field for the PC you want to block.
2.
Click
Add MAC Address
.
3.
Repeat above steps for up to twenty MAC addresses.
Page 43 / 78
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Advanced Pages • Advanced Port Filtering Page
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
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570280-001-a
Advanced Port Filtering Page
This page 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 PCs, and this setting is not IP
address or MAC address specific. For example, to block all PCs on the private LAN from
accessing HTTP sites (or “web surfing”), set the “Start Port” to 80, “End Port” to 80,
“Protocol” to TCP, select
Enabled
, and then click
Apply.
Field Descriptions for the Advanced Port Filtering Page
Field
Description
Start Port
Enter the starting port number.
End Port
Enter the ending port number.
Protocol
Select
TCP
,
UDP
, or
Both
from the drop-down list.
Enabled
Select for each port that you want to activate the IP port filters.
Page 44 / 78
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Advanced Pages • Advanced Port Forwarding Page
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
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570280-001-a
Advanced Port Forwarding Page
This page allows you to run a publicly accessible server on the LAN by specifying the
mapping of TCP/UDP ports to a local PC. 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 public Internet.
A table of commonly used Port numbers is also displayed on the page for your
convenience. The ports used by some common applications are:
•
HTTP: 80
•
FTP: 20, 21
•
Secure Shell: 22
•
Telnet: 23
•
SMTP e-mail: 25
•
SNMP: 161
To map a port, you must enter the range of port numbers that should be forwarded
locally and the IP address to which traffic to those ports should be sent. If only a single
port specification is desired, enter the same port number in the “start” and “end”
locations for that IP address.
Page 45 / 78
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Advanced Pages • Advanced Port Triggers Page
Motorola SURFboard SBG941 Series Wireless Cable Modem Gateways • User Guide
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570280-001-a
Advanced Port Triggers Page
This page allows you to configure dynamic triggers to specific devices on the LAN. This
allows for special applications that require specific port numbers with bi-directional traffic
to function properly. Applications such as video conferencing, gaming, and some
messaging program features may require these special settings.
The Advanced Port Triggers are similar to Advanced Port Forwarding except that they are
not static ports held open all the time. When the Configuration Manager detects
outgoing data on a specific IP port number set in the “Trigger Range,” the resulting ports
set in the “Target Range” are opened for incoming (sometimes referred to as
bi-directional ports) data. If no outgoing traffic is detected on the “Trigger Range” ports
for 10 minutes, the “Target Range” ports will close. This is a safer method for opening
specific ports for special applications (e.g. video conferencing programs, interactive
gaming, file transfer in chat programs, etc.) because they are dynamically triggered and
not held open constantly or erroneously left open via the router administrator and
exposed for potential hackers to discover.
Field Descriptions for the Advanced Port Triggers Page
Field
Description
Trigger Range
Start Port
The starting port number of the Port Trigger range.

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