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MBR L13
–
User’s
Guide
41
4
.
By default, the L13 will forward traffic to the same port as the incoming port. If you wish to redirect traffic to
a different port, select the
Specify
option in the
Forward to Port
drop-down menu. The screen refreshes, and
an additional field appears, enabling you to enter the port number.
Figure 45:
Forward to a Specific Port
8.
By default, the rule will always be active. However, you can configure scheduler rules by selecting
User
Defined
, in order to define time segments during which the rule may be active. Once a scheduler rule(s) is
defined, the
Schedule
drop-down menu will allow you to choose between the available rules.
9.
Click the
OK
button to save your changes. The
Port Forwarding
screen displays a summary of the rule that
you have just added.
You can edit a port-forwarding rule as necessary.
To edit a port-forwarding rule:
Click its entry under the
Local Host
column in the
Port Forwarding
screen.
You can disable a rule in order to make a service unavailable without having to remove the rule from the
Port
Forwarding
screen. This may be useful if you wish to make the service unavailable only temporarily with plans to
reinstate it in the future.
To temporarily disable a rule:
Clear the check box next to the service name.
To reinstate it at a later time, simply reselect the check box.
To remove a rule:
Click the action
icon for the service. The service will be permanently removed.
3.7.1.4
Gaming
Most games and gaming consoles only require UPnP (Universal Plug-n-Play) to be turned on. L13 is preconfigured with
UPnP “ON”, as the default.
Some games or other applications also require port forwarding in order for them to be able
to access internet services. Most use the common gaming ports.
The Gaming feature allows you to select one computer on the local network for gaming activities. Port forwarding on
this computer will automatically be set up on this computer for the common gaming ports.
To designate a computer for gaming:
1.
In the WBM, select the
Firewall
menu item under the
Services
tab, and click the
Gaming
link. The
Gaming
screen appears.
Page 42 / 122
MBR L13
–
User’s
Guide
42
Figure 46: Gaming
2.
Select the
Gaming Mode Enabled
checkbox.
3.
Under
Game Host IP Address
, enter the IP address of the gaming computer. The port forwarding settings
of the gaming computer are displayed under
Gaming Profile
.
4.
Click
OK
. The settings are saved.
3.7.1.5
DMZ Host
The DMZ (Demilitarized) Host feature allows one of the local computers to be exposed to the Internet. Designate a
DMZ host when:
You wish to use a special-purpose Internet service, such as a video-conferencing program, that is not present in
the Port Forwarding list and for which no port range information is available.
You are not concerned with security and wish to expose one computer to all services without restrictions.
Warning
: A DMZ host is not protected by the firewall and may be vulnerable to attack. Designating a DMZ host may
also put other computers in the local network at risk. When designating a DMZ host, you must consider the security
implications and protect it if necessary.
An incoming request for access to a service in the local network, such as a Web server, is fielded by the L13. The L13
will forward this request to the DMZ host (if one is designated) unless the service is being provided by another PC in
the local network (assigned in Port Forwarding), in which case that PC will receive the request instead.
To designate a local computer as a DMZ Host:
1
.
Click
DMZ Host
under the Firewall menu. The
DMZ Host
screen appears.
Page 43 / 122
MBR L13
–
User’s
Guide
43
Figure 47: DMZ Host
2
.
Enter the local IP address of the computer that you would like to designate as a DMZ host and select the
check box. Note that only one LAN computer may be a DMZ host at any time.
3
.
Click
OK
to save the settings.
You can disable the DMZ host so that it will not be fully exposed to the Internet, but keep its IP address recorded on
the
DMZ Host
screen. This may be useful if you wish to disable the DMZ host but expect that you will want to enable it
again in the future.
To disable the DMZ host so that it will not be fully exposed to the Internet:
Clear the check box next to the DMZ IP designation, and click OK. To reinstate it at a later time, simply reselect the
check box.
3.7.1.6
Port Triggering
Port triggering can be used for dynamic port forwarding configuration. By setting port triggering rules, you can allow
inbound traffic to arrive at a specific LAN host using ports different than those used for the outbound traffic. This is
called port triggering since the outbound traffic triggers to which ports inbound traffic is directed.
For example, consider a gaming server that is accessed using UDP protocol on port 2222. The gaming server responds
by connecting the user using UDP on port 3333 when starting gaming sessions. In such a case you must use port
triggering, since this scenario conflicts with the following default firewall settings:
The firewall blocks inbound traffic by default.
The server replies to L13 IP, and the connection is not sent back to your host, since it is not part of a session.
In order to solve this you need to define a Port Triggering entry, which allows inbound traffic on UDP port 3333 only
after a LAN host generated traffic to UDP port 2222. This will result in accepting the inbound traffic from the gaming
server and sending it back to the LAN Host which originated the outgoing traffic to UDP port 2222. Select the
'Port
Triggering
tab in the
Security
management screen. The
Port Triggering
screen will appear (see Figure 48:
Port
Triggering
). This screen will list all of the port triggering entries.
Figure 48:
Port Triggering
To add an entry for the gaming example above:
1.
Select the
User Defined
option in the
Protocol
column to add an entry. The
Edit Port Triggering Rule
screen
will appear.
Page 44 / 122
MBR L13
–
User’s
Guide
44
Figure 49: Edit Port Triggering Rule
2.
Enter a name for the service (e.g. "game_server")
3.
Click the
New Trigger Ports
link. The
Edit Service Server Ports
screen will appear.
Figure 50: Edit Service Server Ports
4.
In the Protocol combo-box, select UDP. The screen will refresh, providing source and destination port
options.
5.
Leave the Source Ports combo-box at its default "Any".
6.
In the Destination Ports combo-box, select "Single".
7.
The screen will refresh again, providing an additional field in which you should enter "2222" as the
destination port.
Figure 51:
Edit Service Server Ports
8.
Click
OK
to save the settings.
9.
Back in the
Edit in
Outgoing Trigger Ports table new added entry
screen; click the
New Opened Ports
link. The
Edit Service Opened Ports
screen will appear.
Page 45 / 122
MBR L13
–
User’s
Guide
45
Figure 52:
Edit Service Opened Ports
10.
Similar to the trigger ports screen, select UDP as the protocol, leave the source port at "Any", and enter a
3333 as the single destination port.
Figure 53:
Edit Service Opened Ports
11.
Click
OK
to save the settings.
You can disable a port triggering rule without having to remove it from the
Port Triggering
screen. To temporarily
disable a rule, clear the check box next to the service name. To reinstate it at a later time, simply reselect the check
box. To remove a rule, click the
action icon for the service. The service will be permanently removed.
Note
: There may be a few default port triggering rules listed when you first access the port triggering screen. Please
note that disabling these rules may result in non-existent gateway functionality.
3.7.1.7
Website Restrictions
You may configure the L13 to block specific Internet Web sites so that they cannot be accessed from computers in the
local network. Furthermore, restrictions can be applied to a comprehensive and automatically-updated table of sites
to which access is not recommended.
To block access to a Website:
1.
Click the
Website Restrictions
link of the
Firewall
menu item under the
Services
tab.
Figure 54:
Website Restrictions
2.
Click the
New Entry
link. The
Restricted Website
screen appears.

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