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WiFi Cable Modem Router C3700

LAN Setup Screen Fields

Use this screen to view or change the LAN setup fields.

LAN TCP/IP Setup

•

IP Address

. The LAN IP address of the modem router.

•

IP Subnet Mask

. The LAN subnet mask of the modem router. When combined with the

IP address, the IP subnet mask allows a device to know the following:

-

Which other addresses are local to it

-

Which other addresses must be reached through a gateway

DHCP IP Pool

•

Starting IP Address

. Specify the start of the range for the pool of IP addresses in the

same subnet as the modem router.

•

Ending IP Address

. Specify the end of the range for the pool of IP addresses in the

same subnet as the modem router.

Address Reservation

When you specify a reserved IP address for a computer on the LAN, that computer receives

the same IP address each time it accesses the DHCP server of the modem router. Assign

reserved IP addresses to servers that require permanent IP settings.

Use the Router as a DHCP Server

By default, the modem router functions as a DHCP server. This capability allows the modem

router to assign IP, DNS server, and default gateway addresses to all computers connected

to the LAN that is connected to the modem router. The assigned default gateway address is

the LAN address of the modem router. The modem router assigns IP addresses to the

attached computers from a pool of addresses that are specified in this screen. Each pool

address is tested before it is assigned to avoid duplicate addresses on the LAN. For most

applications, the default DHCP and TCP/IP settings of the modem router are satisfactory.

You can specify the pool of IP addresses that can be assigned by setting the starting IP

address and ending IP address. These addresses are part of the same IP address subnet as

the LAN that is connected to the modem router. Using the default addressing scheme, you

define a range between 192.168.0.2 and 192.168.0.254. You can save part of the range for

devices with fixed addresses.

The modem router delivers the following parameters to any LAN device that requests DHCP:

•

An IP address from the range you have defined

•

Subnet mask

•

Gateway IP address (the LAN IP address of the modem router)

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WiFi Cable Modem Router C3700

•

Primary DNS server (if you entered a primary DNS address in the Internet Setup screen;

otherwise, the LAN IP address of the modem router)

•

Secondary DNS server (if you entered a secondary DNS address in the Internet Setup

screen)

To use another device on your network as the DHCP server or to configure manually the

network settings of all of your computers, clear the

Use Router as DHCP Server

check box

and click the

Apply

button. Otherwise, leave this check box selected. If this service is not

enabled and no other DHCP server is available on your network, set the IP addresses of your

computer manually or other devices cannot access the modem router.

Address Reservation

When you specify a reserved IP address for a computer on the LAN, that computer always

receives the same IP address each time it accesses the DHCP server of the modem router.

Assign reserved IP addresses to computers or servers that require permanent IP settings.

1.

From the Advanced tab, select

Setup > LAN Setup

.

The following screen displays:

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WiFi Cable Modem Router C3700

2.

Click the

Add

button.

3.

In the IP Address field, type the IP address to assign to the computer or server. (Choose an

IP address from the LAN subnet of the modem router, such as 192.168.0.x.)

4.

Type the MAC address of the computer or server.

Tip:

If the computer is already on your network, copy its MAC address from

the Attached Devices screen and paste it here.

5.

To enter the reserved address into the table, click the

Apply

button.

The reserved address is not assigned until the next time the computer contacts the DHCP

server of the modem router. Reboot the computer or access its IP configuration and force

a DHCP release and renew.

To edit or delete a reserved address entry, select the radio button next to the reserved

address you want to edit or delete. Then click

Edit

or

Delete

.

29

4

4.

Security

Keep unwanted content out of your network

This chapter explains how to prevent objectionable content from reaching the computers and

other devices that are connected to your network.

This chapter includes the following sections:

•

Keyword Blocking of HTTP Traffic

•

Block Services (Port Filtering)

•

Schedule Blocking

Security

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WiFi Cable Modem Router C3700

Keyword Blocking of HTTP Traffic

Use keyword blocking to prevent certain types of HTTP traffic from accessing your network.

1.

From the Advanced tab, select

Security >

Block Sites

.

2.

Select one of the keyword blocking options:

•

Never

. Turn off keyword blocking.

•

Per Schedule

. Turn on keyword blocking according to the Schedule screen settings.

(See

Schedule Blocking

on page

32.)

•

Always

. Turn on keyword blocking.

3.

In the keyword field, enter a keyword or domain, click

Add URL Keyword,

and click the

Apply

button.

The keyword list supports up to 32 entries. Here are some sample entries:

•

Specify XXX to block http://www.badstuff.com/xxx.html.

•

Specify .com if you want to allow only sites with domain suffixes such as .edu or .gov.

•

Enter a period (

.

) to block all Internet browsing access.



To delete a keyword or domain:

1.

Select the keyword that you want to delete from the list.

2.

Click

Delete URL Keyword

.

3.

Click the

Apply

button.

4.

Your changes are saved.



To specify a trusted computer:

You can exempt one trusted computer from blocking and logging. The computer that you

exempt must have a fixed IP address.

1.

Select

Allow trusted IP address to visit blocked sites

.