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D6300 WiFi DSL Modem Router

•

Disable IGMP Proxying

. The IGMP Proxying function lets a LAN computer receive the

multicast traffic it is interested in from the Internet. Click this check box to disable the

function if you do not need it.

•

NAT Filtering

. Network Address Translation (NAT) determines how the WiFi 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

. Some VoIP applications do not work well with the SIP ALG. Enabling

this option to turn off the SIP ALG might help your VoIP devices to create or accept a call

through the router.

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 WiFi 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.

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.

Incoming traffic from the Internet is discarded by the WiFi modem router unless the traffic is a

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

Forwarding/Port Triggering 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 set up a default DMZ server:

1.

On the WAN Setup screen, select the

Default DMZ Server

check box.

2.

Type the IP address.

3.

Click

Apply

.

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 any device in the data path has a lower MTU

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setting than the other devices, the data packets have to be split or “fragmented” to

accommodate the device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often just the default value, and changing

the value might fix one problem but cause another. Leave 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

-

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 such as the inability 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 9.

Common MTU sizes

MTU

Application

1500

The largest Ethernet packet size and the default value. This is the typical setting for

non-PPPoE, non-VPN connections, and is the default value for NETGEAR WiFi 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.

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

To change the MTU size:

1.

Select

ADVANCED > Setup > WAN Setup

.

2.

In the MTU Size field, enter a new size from 64 through 1500.

3.

Click

Apply

to save the settings.

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 WiFi modem router is shipped preconfigured to use private IP addresses on the LAN

side and to act as a DHCP server. The WiFi 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 should be suitable for most applications. If your network requires a different IP

addressing scheme, make those changes in the LAN Setup screen.



To change the LAN settings:

Note:

If you change the LAN IP address of the WiFi modem router while

connected through the browser, you are disconnected. You have to

open a new connection to the new IP address and log in again.

1.

Select

ADVANCED > Setup > LAN Setup

to display the following screen:

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2.

Enter the settings that you want to customize. These settings are described in the following

section,

LAN Setup Screen Settings

.

3.

Click

Apply

to save your changes.

LAN Setup Screen Settings

LAN TCP/IP Setup

•

IP Address

. The LAN IP address of the WiFi modem router.

•

IP Subnet Mask

. The LAN subnet mask of the WiFi 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 have to be reached through a gateway or WiFi modem router.

•

RIP Direction

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

information with other routers. This setting controls how the router sends and receives

RIP packets. Both is the default setting. With the Both or Out Only setting, the router

broadcasts its routing table periodically. With the Both or In Only setting, the router

incorporates the RIP information that it receives.

•

RIP Version

. This setting controls the format and the broadcasting method of the RIP

packets that the WiFi modem router sends. It recognizes both formats when receiving. By

default, the RIP function is disabled.

-

RIP-1

is universally supported. It is adequate for most networks, unless you have an

unusual network setup.

-

RIP-2

carries more information. Both RIP-2B and RIP-2M send the routing data in

RIP-2 format. RIP-2B uses subnet broadcasting. RIP-2M uses multicasting.

Use Router as a DHCP Server

This check box is selected so that the WiFi modem router functions as a Dynamic Host

Configuration Protocol (DHCP) server.

•

Starting IP Address

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

same subnet as the WiFi modem router.

•

Ending IP Address

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

same subnet as the WiFi 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 WiFi modem router’s DHCP server. Assign

reserved IP addresses to servers that require permanent IP settings.

Use the WiFi DSL Modem Router as a DHCP Server

By default, the WiFi modem router functions as a DHCP server, allowing it to assign IP, DNS

server, and default gateway addresses to all computers connected to the WiFi modem

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

router. The WiFi modem router assigns IP addresses to the attached computers 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 WiFi modem router are satisfactory.

You can 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 WiFi modem 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.

The WiFi 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 WiFi modem router’s LAN IP address)

•

Primary DNS server (if you entered a primary DNS address in the Internet Basic Settings

screen; otherwise, the WiFi modem router’s LAN IP address)

•

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

Settings screen)

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

network settings of all of your computers, clear the

Use Router as DHCP Server

check box

and click

Apply

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

no other DHCP server is available on your network, you need to set your computers’ IP

addresses manually or they are not able to access the WiFi 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 WiFi modem router’s DHCP server.

Reserved IP addresses should be assigned to computers or servers that require permanent

IP settings.



To reserve an IP address:

1.

In the Address Reservation section of the screen, click the

Add

button. The following

screen displays:

2.

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

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