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WAN Setup

To change broadband Internet connection settings, use the Broadband Settings screen, as

described in

Manually Configure Your Internet Settings

on page

15.

To view or change the WAN setup:

1.

From the main menu, select WAN Setup to display

the WAN Setup screen.

2.

Make the changes that you want, and then click

Apply

to save the settings.

The WAN Setup fields are described in the table below.

Table 4.

Setting

Description

Disable SPI Firewall

This check box is usually cleared so that the firewall protects your

LAN against port scans and denial of service attacks. This check box

should be selected only in special circumstances.

Default DMZ Server

This feature is sometimes helpful when you are using some online

games and videoconferencing. Be careful when using this feature

because it makes the firewall security less effective. See

Setting Up

a Default DMZ Server

on page

68.

Respond to Ping on Internet

If you want the router to respond to a ping from the Internet, select

this check box. This should be used only as a diagnostic tool, since it

allows your router to be discovered. Do not select this check box

unless you have a specific reason to do so.

MTU Size

Maximum Transmit Unit (MTU) value. For most Ethernet networks

this is 1500 bytes, or 1492 bytes for PPPoE connections, or 1436

bytes for PPTP connections.

NAT Filtering

This is set to

Secured

to provide a secure firewall to protect

computers on the LAN from attacks from the Internet. The Open

setting is less secure.

Disable SIP ALG

Some VoIP applications do not work well with SIP ALG. Selecting

this check box might help your VoIP devices create or accept a call

through the router.

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Setting Up a Default DMZ Server

WARNING!

For security reasons, you should avoid using the default DMZ

server feature. When a computer is designated as the default DMZ

server, it loses much of the protection of the firewall, and is

exposed to many exploits from the Internet. If compromised, the

computer can be used to attack your network.

The default DMZ server feature is helpful when you are using some online games and

videoconferencing applications that are incompatible with NAT. The router is programmed to

recognize some of these applications and to work correctly with them, but there are other

applications that might not function well. In some cases, one local computer can run the

application correctly if that computer’s IP address is entered as the default DMZ server.

Incoming traffic from the Internet is normally discarded by the router unless the traffic is a

response to one of your local computers or a service that you have configured in the Ports

screen. Instead of discarding this traffic, you can have it forwarded to one computer on your

network. This computer is called the default DMZ server.

To assign a computer or server to be a default DMZ server:

1.

Go to the WAN Setup screen as described in the previous section.

2.

Select the

Default DMZ Server

check box.

3.

Type the IP address for that server.

4.

Click

Apply

to save your changes.

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LAN Setup

The LAN Setup screen allows configuration of LAN IP services such as DHCP and RIP.

These features can be found under Advanced in the router main menu.

The router is shipped preconfigured to use private IP addresses on the LAN side, and to act

as a DHCP server. The router default LAN IP configuration is:

•

LAN IP address. 192.168.0.1

•

Subnet mask. 255.255.255.0

These addresses are part of the Internet Engineering Task Force (IETF)–designated private

address range for use in private networks, and should be suitable in most applications. If your

network has a requirement to use a different IP addressing scheme, you can make those

changes in this screen.

Tip:

If you change the LAN IP address of the router while connected through

the browser, you will be disconnected, and so will others connected to

the router. To connect to the router, you must open a new connection to

the new IP address and log in again. Others using the router must restart

their computers to connect to the router again.

To view or change the LAN setup:

1.

Select LAN IP to display the LAN Setup screen.

2.

Change the settings. For more information, see

DHCP Settings

on page

70, or

Reserved IP

Addresses

on page

71.

3.

Click

Apply

to save the changes.

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The LAN TCP/IP Setup parameters are explained in the table below.

Table 5.

Settings

Description

Device Name

LAN TCP/IP

Setup

IP Address

The LAN IP address of the router.

IP Subnet Mask

The LAN subnet mask of the router. Combined with the IP address,

the IP subnet mask allows a device to know which other addresses

are local to it, and which must be reached through a gateway or

router.

DHCP Server

For more

information, see

DHCP Settings

on page

70.

Use Router as a DHCP

Server

This check box is usually selected so that the router functions as a

Dynamic Host Configuration Protocol (DHCP) server. See

DHCP

Settings

on page

70.

Starting IP Address

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

subnet as the router.

Ending IP Address

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

subnet as the router.

Address Reservation

For more information, see

DHCP Settings

on page

70.

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

that computer receives the same IP address each time it access the

router’s DHCP server. Assign reserved IP addresses to servers that

require permanent IP settings.

DHCP Settings

By default, the router functions as a Dynamic Host Configuration Protocol (DHCP) server,

allowing it to assign IP, DNS server, and default gateway addresses to all computers

connected to the router’s LAN. The assigned default gateway address is the LAN address of

the router. IP addresses is assigned to the attached PCs from a pool of addresses 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 router are satisfactory.

Click the link to the online document

ITCP/IP Networking Basics

on page

96 for an

explanation of DHCP and information about how to assign IP addresses for your network.

Use Router as DHCP Server

If another device on your network will be the DHCP server, or if you will manually configure

the network settings of all of your computers, clear the

Use Router as DHCP Server

check

box on the LAN IP Setup screen. Otherwise, leave it selected.

Specify the pool of IP addresses to be assigned by filling in the

Starting IP Address

and

Ending IP Address

fields. These addresses should be part of the same IP address subnet

as the router’s LAN IP address. Using the default addressing scheme, you should define a

range between 192.168.0.2 and 192.168.0.254, although you might want to save part of the

range for devices with fixed addresses.

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The 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 is the router’s LAN IP address.

•

Primary DNS server, if you entered a primary DNS address in the Basic Settings screen;

otherwise, the router’s LAN IP address.

•

Secondary DNS server, if you entered a secondary DNS address in the Basic Settings

screen.

•

WINS server (Windows Internet Naming Service Server) determines the IP address

associated with a particular Windows computer. A WINS server records and reports a list

of names and IP address of Windows PCs on its local network. If you connect to a remote

network that contains a WINS server, enter the server’s IP address here. This allows your

PCs to browse the network using the Network Neighborhood feature of Windows.

Reserved IP Addresses

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

receives the same IP address each time it access the router’s DHCP server. Reserved IP

addresses should be assigned to servers that require permanent IP settings.

To reserve an IP address:

1.

Click the

Add

button.

2.

In the

IP Address

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

IP address from the router’s LAN subnet, such as 192.168.0.x.

3.

Type the MAC address of the computer or server.

Tip:

If the computer is on your network, it is listed on the same screen for your

convenience. Clicking the radio button for each entry in the attached

device list fills in the fields automatically with the computer’s MAC

address and name.

4.

Click

Apply

to enter the reserved address into the table.

Note:

The reserved address will not be assigned until the next time the

computer contacts the router’s DHCP server. Reboot the computer

or access its IP configuration and force a DHCP release and renew.

To edit or delete a reserved address entry:

1.

Click the button next to the reserved address you want to edit or delete.

2.

Click

Edit

or

Delete

.