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Page 56 / 76 Scroll up to view Page 51 - 55
Advanced Settings
56
WiFi Cable Modem Router C3700
The following screen displays:
Port Forwarding is selected as the service type.
2.
From the Service Name list, select the service or game that you host on your network. If the
service does not display in the list, see
Add a Custom Service
on page
56.
3.
In the corresponding Server IP Address field, enter the last digit of the IP address of your
local computer that provides this service.
4.
Click
Add
. The service displays in the list in the screen.
Add a Custom Service
To define a service, game, or application that does not display in the Service Name list,
determine which port number or range of numbers the application uses. You can usually
determine this information by contacting the publisher of the application or user groups or
newsgroups.
To add a custom service:
1.
From the Advanced tab, select
Advanced Setup > Port Forwarding/Port Triggering
.
2.
Select
Port Forwarding
as the service type.
3.
Click the
Add Custom Service
button.
Page 57 / 76
Advanced Settings
57
WiFi Cable Modem Router C3700
The following screen displays:
4.
In the Service Name field, enter a descriptive name.
5.
In the Protoco
l
list, select the protocol. If you are unsure, select
TCP/UDP
.
6.
In the Starting Port fields, enter the beginning port number.
•
If the application uses a single port, enter the same port number in the Ending Port
field.
•
If the application uses a range of ports, enter the ending port number of the range in
the Ending Port field.
7.
In the Internal IP Address field, enter the IP address of your local computer that provides this
service.
8.
Click the
Apply
button.
The service displays in the list in the Port Forwarding/Port Triggering screen.
Edit or Delete a Port Forwarding Entry
To edit or delete a port forwarding entry:
1.
In the table, select the radio button next to the service name.
2.
Click
Edit Service
or
Delete Service
.
Application example: Making a Local Web Server Public
If you host a web server on your local network, you can use port forwarding to allow web
requests from anyone on the Internet to reach your web server.
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 modem router always gives your web server
an IP address of 192.168.0.33.
Page 58 / 76
Advanced Settings
58
WiFi Cable Modem Router C3700
2.
In the Port Forwarding/Port Triggering screen, configure the modem router to forward the
HTTP service to the local address of your web server at
192.168.0.33
. HTTP (port 80) is the
standard protocol for web servers.
3.
(Optional) Register a host name with a Dynamic DNS service, and configure your modem
router to use the name as described in
Dynamic DNS
on page
60. To access your web
server from the Internet, a remote user must know the IP address that your ISP assigns.
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.
Set Up 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 opens incoming ports that are different from the outgoing port.
When port triggering is enabled, the modem router monitors outbound traffic looking for a
specified outbound “trigger” port. When the modem router detects outbound traffic on that
port, it remembers the IP address of the local computer that sent the data. The modem 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), enable Universal
Plug and Play (UPnP) according to the instructions in
Remote
Management
on page
61.
To set up port triggering, you need to know which inbound ports the application needs. Also,
you need to know the number of the outbound port that triggers 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.
From the Advanced tab, select
Advanced Setup > Port Forwarding/Port Triggering
.
Page 59 / 76
Advanced Settings
59
WiFi Cable Modem Router C3700
2.
Select the
Port Triggering
radio button.
3.
Clear the
Disable Port Triggering
check box if it is selected.
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 modem router is retained even
though it is not used.
4.
In the Port Triggering Time-out field, enter a value up to 9999 minutes.
5.
This value controls the inactivity timer for the designated inbound ports. The inbound ports
close when the inactivity time expires. This step is required because the modem router
cannot be sure when the application has terminated.
6.
Click the
Add Service
button.
The following screen displays:
Page 60 / 76
Advanced Settings
60
WiFi Cable Modem Router C3700
7.
In the Service Name field, type a descriptive service name. No spaces are allowed for the
service name field.
8.
In the Service User list, select
Any
(the default) to allow any computer on the Internet to use
this service. Otherwise, select
Single address
, and enter the IP address of one computer to
restrict the service to a particular computer.
9.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
10.
In the Triggering Port field, enter the number of the outbound traffic port that causes the
inbound ports open.
11.
Enter the inbound connection port information in the Connection Type, Starting Port, and
Ending Port fields.
12.
Click the
Apply
button.
The service displays in the Port Triggering Portmap table.
Dynamic DNS
If your Internet service provider (ISP) gave you a permanently assigned IP address, you can
register a domain name and have that name linked with your IP address by public Domain
Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP
address, you do not know in advance what your IP address is, and the address can change
frequently. In this case, you can use a commercial Dynamic DNS service. This type of service
lets you register your domain to their IP address and forwards traffic directed at your domain
to your frequently changing IP address.
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x), the Dynamic
DNS service does not work because private addresses are not routed on the Internet.
Your modem router contains a client that can connect to the Dynamic DNS service that
DynDNS.org provided. First visit their website at
and obtain an
account and host name that you configure in the modem router. Then, whenever your
ISP-assigned IP address changes, your modem router automatically contacts the Dynamic
DNS service provider, logs in to your account, and registers your new IP address. If your host
name is hostname, for example, you can reach your modem router at
.
To set up Dynamic DNS:
1.
From the Advanced tab, select
Advanced Setup > Dynamic DNS
.

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