NETGEAR DGN2000 Router Manual PDF (Setup & Configuration Guide)

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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual

5-2

Advanced Configuration

v1.0, July 2008

Setting Up a Default DMZ Server

The default demilitarized zone (DMZ) server feature is helpful when you use some online games

and videoconferencing applications that are incompatible with NAT. The modem 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 usually discarded by the modem 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.

How to Configure a Default DMZ Server

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

1.

Log in to the modem router at its default LAN address of

http://192.168.0.1

with its default

user name of

admin

and default password of

password

, or using whatever user name,

password, and LAN address you have chosen for the modem router.

Note:

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.

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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual

Advanced Configuration

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2.

In the main menu, under Advanced, click

WAN Setup

to display the following screen.

3.

Select the

Default DMZ Server

check box.

4.

Type the IP address for that server.

5.

Click

Apply

to save your changes.

Other WAN Options

The WAN Setup screen that is shown in

Figure 5-1

also allows you perform the following tasks:

•

Connecting Automatically, as Required

Usually, this option should be enabled, so that an Internet connection is made automatically,

whenever Internet-bound traffic is detected. If this causes high connection costs, you can

disable this setting.

If this setting is disabled, you must connect manually, using the screen that you access by

clicking the

Connection Status

button on the Status screen.

If you have an Always on connection, this setting has no effect.

•

Disabling Port Scan and DOS Protection

Figure 5-1

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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual

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Advanced Configuration

v1.0, July 2008

The firewall protects your LAN against port scans and denial of service (DOS) attacks. This

protection should be disabled only in special circumstances.

•

Responding to a Ping on an Internet WAN Port

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

Respond to

Ping on Internet WAN Port

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

allows your modem router to be discovered. Do not select this check box unless you have a

specific reason to do so.

•

Setting the MTU Size

The normal MTU (Maximum Transmit Unit) value for most Ethernet networks is 1500 bytes,

or 1492 bytes for PPPoE connections. For some ISPs you might need to reduce the MTU. But

this is rarely required, and should not be done unless you are sure it is necessary for your ISP

connection.

•

Disabling the SIP ALG

The Session Initiation Protocol (SIP) Application Level Gateway (ALG) is enabled by default

to optimize VoIP phone calls that use the SIP. The

Disable SIP ALG

check box allows you to

disable the SIP ALG. Disabling the SIP ALG might be useful when running certain

applications.

Configuring LAN IP Settings

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

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

as a DHCP server. The modem router’s default LAN IP configuration is as follows:

•

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 by opening the

LAN IP Setup menu.

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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual

Advanced Configuration

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Under Advanced in the main menu, select

LAN IP Setup

.

The LAN TCP/IP Setup settings are:

•

IP Address

. This is the LAN IP address of the modem router.

•

IP Subnet Mask

.

This is the LAN subnet mask of the modem 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 modem router.

•

RIP Direction

.

Router Information Protocol (RIP) allows a modem router to exchange routing

information with other routers. The RIP Direction selection controls how the modem router

sends and receives RIP packets. Both is the default setting.

–

When set to

Both

or

Out Only

, the modem router broadcasts its routing table periodically.

–

When set to

Both

or

In Only

, the modem router incorporates the RIP information that it

receives.

–

When set to

None

, the modem router does not send any RIP packets and ignores any RIP

packets received.

Figure 5-2

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Wireless-N ADSL2+ Modem Router DGN2000 Reference Manual

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Advanced Configuration

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•

RIP Version

.

This controls the format and the broadcasting method of the RIP packets that the

modem router sends. It recognizes both formats when receiving. By default, this is set for

RIP-1.

–

RIP-1

.

This version is universally supported. RIP-1 is probably adequate for most

networks, unless you have an unusual network setup.

–

RIP-2

. This version carries more information. Both RIP-2B and RIP-2M send the routing

data in RIP-2 format.

•

RIP-2B

. This version uses subnet broadcasting.

•

RIP-2M

. This version uses multicasting.

•

Access Router Management Interface on additional port

. When NAT is disabled, the

modem router’s management interface may be accessed at the modem router’s LAN address

using the port number you enter. This feature is not available when NAT is enabled.

Configuring DHCP

By default, the modem 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 modem router’s LAN. The assigned default gateway address is the LAN address of the router.

IP addresses are 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. See the

online document that you can access from

“TCP/IP Networking Basics” in Appendix B

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.

Otherwise, leave it selected.

Specify the pool of IP addresses to be assigned by setting the starting IP address and ending IP

address. 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.

Note:

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

the browser, you will be disconnected. You must then open a new connection to the

new IP address and log in again.

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