Advanced Settings

61

WiFi Cable Modem Router C3700

The following screen displays:

2.

Register for an account with one of the Dynamic DNS service providers whose names

display in the Service Provider list.

3.

Select the

Use a Dynamic DNS Service

check box.

4.

Select the name of your Dynamic DNS service provider. If your Dynamic DNS service

provider is DynDNS.org, for example, select

www.dyndns.org

.

5.

Type the host name (or domain name) that your Dynamic DNS service provider gave you.

6.

Type the user name for your Dynamic DNS account. This name is the name that you use to

log in to your account, not your host name.

7.

Type the password (or key) for your Dynamic DNS account.

8.

Click the

Apply

button.

Your configuration is saved.

Remote Management

The remote management feature lets you access your modem router over the Internet to

view or change its settings.

Note:

Be sure to change the modem router default login password to a

secure password. The ideal password contains no dictionary words

from any language and contains uppercase and lowercase letters,

numbers, and symbols. It can be up to 30 characters. See

Set

Password

on page

41.

Advanced Settings

62

WiFi Cable Modem Router C3700



To set up remote management:

1.

From the Advanced tab, select

Advanced Setup > Remote Management

.

2.

Select the

Turn Remote Management On

check box.

3.

Under Allow Remote Access By, specify the external IP addresses to be allowed to access

the modem router’s remote management.

Note:

For enhanced security, restrict access to as few external IP addresses

as practical.

•

To allow access from a single IP address on the Internet, select

Only This

Computer

. Enter the IP address that will be allowed access.

•

To allow access from a range of IP addresses on the Internet, select

IP Address

Range

. To define the allowed range, enter a beginning and ending IP address.

•

To specify IP addresses, select

IP Address List

and type in the allowed IP

addresses.

•

To allow access from any IP address on the Internet, select

Everyone

.

4.

Specify the port number for accessing the web management interface.

Normal web browser access uses the standard HTTP service port 80. For greater

security, enter a custom port number for the remote web management interface. Choose

a number from 1024 to 65535, but do not use the number of any common service port.

The default is 8080, which is a common alternate for HTTP.

5.

Click the

Apply

button.

Your changes take effect.

6.

When you access your modem router from the Internet, type your modem router’s WAN IP

address into your browser’s address or location field followed by a colon (:) and the custom

port number.

Advanced Settings

63

WiFi Cable Modem Router C3700

For example, if your external address is 134.177.0.123 and you use port number 8080,

enter

in your browser.

Universal Plug and Play

Universal Plug and Play (UPnP) helps devices, such as Internet appliances and computers,

to access the network and connect to other devices as needed. UPnP devices can

automatically discover the services from other registered UPnP devices on the network.

Note:

If you use applications such as multiplayer gaming, peer-to-peer

connections, or real-time communications such as instant

messaging or remote assistance (a feature in Windows XP), enable

UPnP.



To turn on Universal Plug and Play:

1.

From the Advanced tab, select

Advanced Setup >

UPnP

.

2.

Specify the following settings:

Turn UPnP On

.

UPnP can be enabled or disabled for automatic device configuration.

The default setting for UPnP is enabled. If this check box is not selected, the modem

router does not allow any device to control the resources automatically, such as port

forwarding (mapping) of the modem router.

Advertisement Period

.

The advertisement period is how often the modem router

broadcasts its UPnP information. This value can range from 1 to 1440 minutes. The

default period is 30 minutes. Shorter durations ensure that control points have current

device status at the expense of more network traffic. Longer durations can compromise

the freshness of the device status, but can significantly reduce network traffic.

Advanced Settings

64

WiFi Cable Modem Router C3700

Advertisement Time to Live

.

The time to live for the advertisement is measured in hops

(steps) for each UPnP packet sent. The time to live hop count is the number of steps a

broadcast packet is allowed to propagate for each UPnP advertisement before it

disappears. The number of hops can range from 1 to 255. The default value for the

advertisement time to live is four hops, which are fine for most home networks. If you

notice that some devices are not being updated or reached correctly, you should increase

this value.

UPnP Portmap Table

.

The UPnP Portmap Table displays the IP address of each UPnP

device that is accessing the modem router and which ports (internal and external) that

device has opened. The UPnP Portmap Table also displays what type of port is open and

whether that port is still active for each IP address.

3.

Click the

Apply

button.

Your settings are saved.

65

7

7.

Troubleshooting

Find and fix common issues

This chapter gives information about troubleshooting your WiFi Cable Modem Router C3700.

For the common problems listed, go to the section indicated.

•

Have I connected the modem router correctly?

Go to

Basic Functions

on page

65.

•

I cannot access the modem router configuration with my browser.

Go to

Cannot Log In to the Modem Router

on page

66.

•

I have configured the modem router but I cannot access the Internet.

Go to

Troubleshoot the ISP Connection

on page

67.

•

I cannot remember the configuration password of the modem router or I want to clear the

configuration and start over again.

Go to

Factory Default Settings

on page

71.

Tip:

NETGEAR provides helpful articles, documentation, and the latest

software updates at

support.netgear.com

.

Basic Functions

After you have turned on power to the modem router, do the following:

1.

Check to see that the Power LED is on.

2.

Check that the numbered Ethernet LEDs come on momentarily.

3.

After a few seconds, check that the local port link LEDs are lit for any local ports that are

connected.

If any of these conditions does not occur, refer to the appropriate following section.