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Security Settings
56
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
To make a local web server public:
1.
Assign your web server either a fixed IP address or a dynamic IP address using DHCP
address reservation. In this example, your router will always give your web server an IP
address of 192.168.1.33.
2.
In the Port Forwarding screen, configure the router to forward the HTTP service to the local
address of your web server at
192.168.1.33
. HTTP (port 80) is the standard protocol for web
servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your router to
use the name. To access your web server from the Internet, a remote user has to know the
IP address that has been assigned by your ISP. However, if you use a Dynamic DNS
service, the remote user can reach your server by a user-friendly Internet name, such as
mynetgear.dyndns.org.
Configure Port Triggering
Port triggering is a dynamic extension of port forwarding that is useful in these cases:
•
More than one local computer needs port forwarding for the same application (but not
simultaneously).
•
An application needs to open incoming ports that are different from the outgoing port.
When port triggering is enabled, the router monitors outbound traffic looking for a specified
outbound “trigger” port. When the router detects outbound traffic on that port, it remembers
the IP address of the local computer that sent the data. The router then temporarily opens the
specified incoming port or ports, and forwards incoming traffic on the triggered ports to the
triggering computer.
While port forwarding creates a static mapping of a port number or range to a single local
computer, port triggering can dynamically open ports to any computer that needs them and
can close the ports when they are no longer needed.
Note:
If you use applications such as multiplayer gaming, peer-to-peer
connections, real-time communications such as instant messaging,
or remote assistance (a feature in Windows XP), you should also
enable Universal Plug and Play (UPnP).
To configure port triggering, you need to know which inbound ports the application needs.
Also, you need to know the number of the outbound port that will trigger the opening of the
inbound ports. You can usually determine this information by contacting the publisher of the
application or user groups or newsgroups.
To set up port triggering:
1.
Select
Content Filtering > Port Forwarding/Port Triggering
to display the following
screen:
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Security Settings
57
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
2.
Select the
Port Triggering
radio button to display the port triggering information.
Figure 24.
Set up port triggering
3.
Clear the
Disable Port Triggering
check box.
Note:
If the Disable Port Triggering check box is selected after you
configure port triggering, port triggering is disabled. However, any
port triggering configuration information you added to the router is
retained even though it is not used.
4.
In the
Port Triggering Timeout
field, enter a value up to 9999 minutes. This value controls
the inactivity timer for the designated inbound ports. The inbound ports close when the
inactivity time expires. This is required because the router cannot be sure when the
application has terminated.
5.
Click
Add Service
.
Figure 25.
Add a service for port triggering
6.
In the
Service Name
field, type a descriptive service name.
7.
In the
Service User
field, select
Any
(the default) to allow this service to be used by any
computer on the Internet. Otherwise, select
Single address
, and enter the IP address of
one computer to restrict the service to a particular computer.
8.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
9.
In the
Triggering Port
field, enter the number of the outbound traffic port that will cause the
inbound ports to be opened.
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Security Settings
58
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
10.
Enter the inbound connection port information in the
Connection Type
,
Starting Port
, and
Ending Port
fields.
11.
Click
Apply
. The service appears in the Port Triggering Portmap table.
Configure Services
Services are functions performed by server computers at the request of client computers. For
example, web servers serve web pages, time servers serve time and date information, and
game hosts serve data about other players’ moves. When a computer on the Internet sends a
request for service to a server computer, the requested service is identified by a service or
port number. This number appears as the destination port number in the transmitted IP
packets. For example, a packet that is sent with destination port number 80 is an HTTP (web
server) request.
The service numbers for many common protocols are defined by the Internet Engineering
Task Force (IETF at
) and published in RFC1700, “Assigned Numbers.”
Service numbers for other applications are typically chosen from the range 1024 to 65535 by
the authors of the application. Although the wireless modem router already holds a list of
many service port numbers, you are not limited to these choices.
To create your own service definitions:
1.
Select
Content Filtering > Services
to display the following screen:
Figure 26.
Services screen
•
To create a new service, click the
Add Custom Service
button to display the Add
Services screen.
•
To edit a service, select its button on the left side of the table, and click
Edit Service
.
•
To delete a service, select its button on the left side of the table, and click
Delete
Service
.
2.
Use the following screen to define or edit a service.
Figure 27.
Add Services screen
•
Name
. Enter a meaningful name for the service.
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Security Settings
59
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
•
Type
. Select the correct type for this service. If in doubt, select
TCP/UDP
. The options
are TCP, UDP, TCP/UDP.
•
Start Port
and
End Port
. If a port range is required, enter the range here. If a single
port is required, enter the same value in both fields.
3.
Click
Apply
to save your changes.
Set the Time Zone
The wireless modem router uses the Network Time Protocol (NTP) to obtain the current time
and date from one of several network time servers on the Internet.
To set the time zone:
1.
Select
Content Filtering > Schedule
to display the following screen:
Figure 28.
Schedule screen
2.
Select your time zone. This setting determines the blocking schedule and time-stamping of
log entries.
3.
If your time zone is in daylight savings time, select the
Adjust for Daylight Savings Time
check box to add one hour to standard time.
Note:
If your region uses daylight savings time, select Adjust for Daylight
Savings Time on the first day and clear it after the last day.
4.
The wireless modem router has a list of NETGEAR NTP servers. If you would prefer to use
a particular NTP server as the primary server, select the
Use this NTP Server
check box,
and enter its IP address.
5.
Click
Apply
to save your settings.
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Security Settings
60
N600 Wireless Dual Band Gigabit ADSL2+ Modem Router DGND3700
Schedule Firewall Services
If you enabled services blocking in the Block Services screen or port forwarding in the Port
Forwarding/Port Triggering screen, you can set up a schedule for when blocking occurs or
when access is not restricted.
To schedule firewall services:
1.
Select
Content Filtering > Schedule
to display the following screen:
Figure 29.
Schedule screen
2.
To block Internet services based on a schedule, select
Every Day
, or select one or more
days. If you want to limit access completely for the selected days, select
All Day
. Otherwise,
to limit access during certain times for the selected days, enter times in the
Start Time
and
End Time
fields.
Note:
Enter the values in 24-hour time format. For example, 10:30 a.m.
would be 10 hours and 30 minutes, and 10:30 p.m. would be 22
hours and 30 minutes. If you set the start time after the end time, the
schedule is effective through midnight the next day.
3.
Click
Apply
to save your settings.
Enable Security Event Email Notification
To receive logs and alerts by email, provide your email information in the E-mail screen, and
specify which alerts you want to receive and how often.
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