Security

31

WiFi Cable Modem Router C3700

2.

In the Trusted IP Address field, enter the IP address.

3.

Click the

Apply

button.

Your changes are saved.

Block Services (Port Filtering)

Server computers perform services 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, a service or port number identifies the requested service. This

number displays as the destination port number in the transmitted IP packets. For example, a

packet that is sent with the 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 - 65535 by

the authors of the application. Although the modem router already holds a list of many

service port numbers, you are not limited to these choices. You can often determine port

number information by contacting the publisher of the application, by asking user groups or

newsgroups, or by searching.

The Block Services screen lets you add and block specific Internet services by computers on

your network. This capability is called service blocking or port filtering. To add a service for

blocking, first determine which port number or range of numbers the application uses.



To block services:

1.

From the Advanced tab, select

Security > Block Services

.

2.

Select either

Per Schedule

or

Always

.

3.

If you selected Per Schedule, specify a time period in the Schedule screen.

4.

To add a service, click the

Add

button.

Security

32

WiFi Cable Modem Router C3700

The Block Services Setup screen displays:

5.

From the Service Type list, select the application or service to allow or block. The list already

displays several common services, but you are not limited to these choices. To add any

additional services or applications that do not already display, select

User Defined.

6.

For User Defined, select the protocol, and enter the name and the range of port numbers of

the service. For known services, these fields are filled in automatically.

If you know that the application uses either TCP or UDP, select the appropriate protocol. If

you are not sure, select

TCP/UDP

.

7.

Enter the starting and ending port numbers. If the application uses a single port number,

enter that number in both fields.

8.

Enter the IP address of the computer that you want to block.

9.

Click

Add

to enable your Block Services Setup selections.

Schedule Blocking

You can specify the days and time that you want to block Internet access.



To schedule blocking:

1.

From the Advanced tab, select

Security > Schedule

.

Security

33

WiFi Cable Modem Router C3700

The following screen displays.

2.

Click the

Add

button.

3.

Set up the schedule for blocking keywords and services.

•

Days to Block

. Select days on which you want to apply blocking by selecting the

appropriate check boxes, or select

Every Day

to select the check boxes for all days.

•

Time of Day to Block

. Select a start and end time in 24-hour format, or select

All

Day

for 24-hour blocking.

4.

Select your time zone from the list. If you use daylight savings time, select the

Automatically adjust for daylight savings time

check box.

5.

Click the

Apply

button.

Your settings are saved.

34

5

5.

Administration

Managing your network

This chapter describes the modem router settings for administering and maintaining your

modem router and home network.

This chapter includes the following sections:

•

View Modem Router Status

•

Router Mode

•

Network Map

•

Back Up Settings

•

Set Password

•

View Event Logs

•

Diagnostics

•

Wireless Channel

Administration

35

WiFi Cable Modem Router C3700

View Modem Router Status



To view modem router status and usage information:

From the Advanced tab, select

Administration > Gateway Status

.

The following screen displays.

Cable Information

The following settings are displayed:

Hardware Version.

The modem router model.

Firmware Version

. The version of the modem router firmware. It changes if you upgrade the

modem router firmware.

Cable Modem Serial Number

. The serial number of the cable modem.

CM certificate

. The status of the cable modem certificate. If ‘Not installed’ displays as the

status, contact your Internet service provider.

CM MAC

. The MAC address of the cable modem.

LAN Port

. The MAC address of LAN port 1.

•

MAC Address

. The Media Access Control address. This address is the unique physical

address that the Ethernet (LAN) port of the modem router uses.

•

IP Address

. The IP address that the Ethernet (LAN) port of the modem router uses. The

default is 192.168.0.1.

•

DHCP Server

. Identifies whether the built-in DHCP server of the modem router is active

for the LAN-attached devices.

To reboot the modem router, click the

Reboot

button.