Internet Setup

31

Dual Band Wireless VDSL2 + Ethernet Gateway

9.

Select an IP Address Assignment radio button.

•

Use DHCP Server

. This method passes more information to LAN devices, but some

IPv6 systems might not support the DHCv6 client function.

•

Auto Config

. This is the default setting.

This setting specifies how the gateway assigns IPv6 addresses to the devices on your

home network (the LAN).

10.

(Optional) Select the

Use This Interface ID

check box and specify the interface ID that you

want to be used for the IPv6 address of the gateway’s LAN interface.

If you do not specify an ID here, the gateway generates one automatically from its MAC

address.

11.

Click the

Apply

button.

Your settings 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 must be split or “fragmented” to

accommodate the device with the smallest MTU.

The best MTU setting for NETGEAR equipment is often 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 experience 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 are experiencing severe performance problems.

•

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

experiencing 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.

Internet Setup

32

Dual Band Wireless VDSL2 + Ethernet Gateway



To change the MTU size:

1.

Launch an Internet browser from a computer or wireless device that is connected to the

network.

2.

Type

http://www.routerlogin.net

or

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

Advanced > Setup > WAN Setup

.

5.

In the

MTU Size

field, enter a value from 64 to 1500.

6.

Click the

Apply

button.

Your change is saved.

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 gateways, adapters, and switches.

1492

Used in PPPoE environments.

1472

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

Internet Setup

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Dual Band Wireless VDSL2 + Ethernet Gateway

1468

Used in some DHCP environments.

1460

Usable by AOL if you do not send or receive 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.

Table 2.

Common MTU sizes

(continued)

MTU

Application

34

4

4.

Control Internet Access

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

other devices that are connected to your network. It also explains how to customize firewall rules

to specify exceptions to how network traffic to and from the Internet is handled.

This chapter includes the following sections:

•

Use Keywords to Block Internet Sites

•

Schedule When to Block Internet Sites

•

Avoid Blocking on a Trusted Computer

•

Set Up Security Event Email Notifications

•

Outbound Firewall Rules

•

Set Up Port Forwarding to a Local Server

•

Port Triggering

Control Internet Access

35

Dual Band Wireless VDSL2 + Ethernet Gateway

Use Keywords to Block Internet Sites

You can use keywords to block certain Internet sites from your network. You can use blocking

all the time or based on a schedule.



To block Internet sites:

1.

Launch a web browser from a computer or wireless device that is connected to the

network.

2.

Type

http://routerlogin.net

or

www.routerlogin.com

.

A login screen displays.

3.

Enter the gateway user name and password.

The user name is

admin

. The default password is

password

. The user name and

password are case-sensitive.

The BASIC Home screen displays.

4.

Select

Advanced > Security >

Block Sites

.

5.

Select a keyword blocking option:

•

Per Schedule

. Use keyword blocking according to a schedule that you set. (See

Schedule When to Block Internet Sites

on page

36.)

•

Always

. Use keyword blocking continuously.

6.

In the

keyword

field, enter a keyword or domain that you want to block.

•

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.