Security

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Wireless Cable Voice Gateway CG3700EMR-1CMNDS

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 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 gateway already holds a list of many service port

numbers, you are not limited to these choices. You can often find 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 find out which port number or range of numbers the application uses.



To block services:

1.

Select

ADVANCED > Security > Block Services

.

2.

Select either

the

Per Schedule

or

Always

radio button.

3.

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

For more information see

Schedule Blocking

on page

32.

Security

32

Wireless Cable Voice Gateway CG3700EMR-1CMNDS

4.

To add a service, click the

Add

button.

The Block Services Setup screen displays:

5.

From the Service Type list, select the application or service to 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.

If you select User Defined, select the protocol, and enter the name and the range of port

numbers of the service.

If you select a known service, 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 a name for this service type in the Service Type/User Defined field.

8.

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

enter that number in both fields.

9.

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

10.

Click the

Add

button.

Your Block Services Setup selections are enabled.

Schedule Blocking

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



To schedule blocking:

1.

Select

ADVANCED >

Security > Schedule

.

Security

33

Wireless Cable Voice Gateway CG3700EMR-1CMNDS

The following screen displays.

2.

Click the

Add

button.

3.

Enter a name for this schedule.

4.

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.

5.

Click the

Apply

button.

Your settings are saved.

34

5

5.

Administration

Managing your network

This chapter describes the gateway settings for administering and maintaining your gateway and

home network.

This chapter includes the following sections:

•

View Gateway Status

•

Router Mode

•

Logs

•

Network Map

•

Back Up Settings

•

Set Password

•

View Event Logs

•

Diagnostics

•

Wireless Channel

Administration

35

Wireless Cable Voice Gateway CG3700EMR-1CMNDS

View Gateway Status



To view gateway status and usage information:

Select

ADVANCED > Administration > Gateway Status

.

The following screen displays.

Cable Information

The following information displays:

•

Hardware Version

. The gateway model.

•

Firmware Version

. The version of the gateway firmware. It changes if you upgrade the

gateway 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

.

•

MAC Address

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

physical address that the Ethernet (LAN) port of the gateway uses.

•

IP Address

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

default is 192.168.0.1.

•

DHCP Server

. Identifies whether the built-in DHCP server of the gateway is active for

the LAN-attached devices.

To reset the admin and password to the default values, click the

Factory Reset

button.

To reboot the gateway, click the

Reboot

button.