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N300 Wireless ADSL2+ Modem Router DGN2200v4

•

To use the PIN method, select the

PIN Number

radio button, enter the client security

PIN, and click

Next

.

Within 2 minutes, go to the client device and use its WPS software to join the network

without entering a password.

The modem router attempts to add the WPS-capable device. The WPS LED

on the

front of the modem router blinks green. When the modem router establishes a WPS

connection, the LED is solid green, and the modem router WPS screen displays a

confirmation message.

WAN Setup

You can use the WAN Setup screen to specify the ADSL or Ethernet port setting for your

Internet connection, though by default the modem router automatically detects the Internet

port. The WAN Setup screen also lets you configure a DMZ (demilitarized zone) server,

change the maximum transmit unit (MTU) size, and enable the modem router to respond to a

ping on the WAN (Internet) port.



To view or change the WAN settings:

1.

Select

Advanced > Setup > WAN Setup

.

2.

Specify the settings for your Internet connection.

The fields in this screen are described in the following section.

3.

Click

Apply

.

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WAN Setup Screen Fields

The following fields are available:

•

WAN Preference

. By default this field is set to Auto-Detect so that the modem router

automatically detects if the Internet connection is through the ADSL port or the

WAN/Ethernet port 4. You can use this field to select Must use DSL WAN or Must use

Ethernet WAN.

•

Use port 4 as

. By default, Auto-Detect is selected so that the modem router detects if

Ethernet port 4 is used as a LAN or WAN port. For example, if you connect a computer to

Ethernet port 4, then it works as a LAN port. You can select LAN or WAN if you do not

want to use the auto-detect setting.

•

Disable Port Scan and DoS Protection

. DoS protection protects your LAN against

denial of service attacks such as Syn flood, Smurf Attack, Ping of Death, Teardrop Attack,

UDP Flood, ARP Attack, Spoofing ICMP, Null Scan, and many others. This should be

disabled only in special circumstances.

•

Default DMZ Server

. This feature is sometimes helpful when you are playing online

games or videoconferencing. Be careful when using this feature because it makes the

firewall security less effective. See the following section,

Default DMZ Server

.

•

Respond to Ping on Internet Port

. If you want the modem router to respond to a ping

from the Internet, select this check box. Use this feature only as a diagnostic tool

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

unless you have a specific reason.

•

Disable IGMP Proxying

. The IGPM proxying feature lets a LAN computer receive the

multicast traffic directed to it from the Internet. Selecting this check box prevents this from

occurring.

•

MTU Size (in bytes)

. 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. This is rarely required. You should change the setting in this

field only if you are sure that it is necessary for your ISP connection. See

Change the

MTU Size

on page

38.

•

NAT Filtering

. Network Address Translation (NAT) determines how the modem router

processes inbound traffic. Secured NAT provides a secured firewall to protect the

computers on the LAN from attacks from the Internet, but might prevent some Internet

games, point-to-point applications, or multimedia applications from functioning. Open

NAT provides a much less secured firewall, but allows almost all Internet applications to

function.

•

Disable SIP ALG

. The Session Initiation Protocol (SIP) Application Level Gateway (ALG)

is enabled by default to optimize VoIP phone calls that use the SIP. Select the

Disable

SIP ALG

check box to disable the SIP ALG. Disabling the SIP ALG might be useful when

you are running certain applications.

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Default DMZ Server

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

videoconferencing applications that are incompatible with Network Address Translation

(NAT). The modem router recognizes some of these applications and works correctly with

them, but other applications 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.

WARNING!

DMZ servers pose a security risk. A computer designated as the

default DMZ server loses much of the protection of the firewall and

is exposed to exploits from the Internet. If compromised, the DMZ

server computer can be used to attack other computers on your

network.

The modem router discards traffic from the Internet that is not a response to one of your

computers or a service that you have set up in the Port Forwarding/Port Triggering screen.

Instead of discarding this traffic, you can have the modem router forward the traffic to one

computer on your network. This computer is called the default DMZ server.



To set up a default DMZ server:

1.

Select

Advanced > Setup > WAN Setup

. screen.

2.

Select the

Default DMZ Server

check box.

3.

Type the IP address.

4.

Click

Apply

.

Your changes are saved.

Change the MTU Size

The maximum transmission unit (MTU) is the largest data packet a network device transmits.

When one network device communicates across the Internet with another, the data packets

travel through many devices along the way. If a device in the data path has a lower MTU

setting than the other devices, the data packets are split or “fragmented” to accommodate the

device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value. In some

situations, changing the value fixes one problem but causes another. Leave the MTU

unchanged unless one of these situations occurs:

•

You have problems connecting to your ISP or other Internet service, and the technical

support of either the ISP or NETGEAR recommends changing the MTU setting. These

web-based applications might require an MTU change:

-

A secure website that does not open, or displays only part of a web page

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-

Yahoo email

-

MSN portal

-

America Online’s DSL service

•

You use VPN and have severe performance problems.

•

You used a program to optimize MTU for performance reasons, and now you have

connectivity or performance problems.

Note:

An incorrect MTU setting can cause Internet communication

problems. For example, you might not be able to access certain

websites, frames within websites, secure login pages, or FTP or

POP servers.

If you suspect an MTU problem, a common solution is to change the MTU to 1400. If you are

willing to experiment, you can gradually reduce the MTU from the maximum value of 1500

until the problem goes away. The following table describes common MTU sizes and

applications.

Table 2.

Common MTU sizes

MTU

Application

1500

The largest Ethernet packet size. This setting is typical for connections that do not use

PPPoE or VPN, and is the default value for NETGEAR modem routers, adapters, and

switches.

1492

Used in PPPoE environments.

1472

Maximum size to use for pinging. (Larger packets are fragmented.)

1468

Used in some DHCP environments.

1460

Usable by AOL if you do not have large email attachments, for example.

1436

Used in PPTP environments or with VPN.

1400

Maximum size for AOL DSL.

576

Typical value to connect to dial-up ISPs.



To change the MTU size:

1.

Select

Advanced > Setup > WAN Setup

.

2.

In the MTU Size field, enter a value from 64 to 1500.

3.

Click

Apply

.

Your change is saved.

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LAN Setup

The LAN Setup screen allows configuration of LAN IP services such as Dynamic Host

Configuration Protocol (DHCP) and Routing Information Protocol (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:

•

LAN IP address.

192.168.0.1

•

Subnet mask.

255.255.255.0

These addresses are part of the designated private address range for use in private networks

and are suitable for most applications.

By default, the modem router acts as a DHCP server. The modem router assigns IP, DNS

server, and default gateway addresses to all computers connected to the LAN. The assigned

default gateway address is the LAN address of the modem router. The modem router tests

each address 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.

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

•

IP address

•

Subnet mask

•

Gateway IP address (the modem router’s LAN IP address)

•

Primary DNS server (if specified in the Internet Setup screen), otherwise, the modem

router’s LAN IP address)

•

Secondary DNS server if you entered this in the Internet Setup screen

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

you are disconnected from the network.



To change the LAN settings:

1.

Select

Advanced > Setup > LAN Setup

.