41

4

4.

Manage Internet, WAN, and LAN

Settings

and

Use the WPS Wizard

This chapter describes how to manage the Internet, WAN, and LAN settings and how to use the

WPS wizard.

This chapter contains the following sections:

•

Manage the Internet Setup

•

Manage the WAN Settings

•

Manage the LAN Settings

•

Use the WPS Wizard to Add a Device to the WiFi Network

Manage Internet, WAN, and LAN Settings and Use the WPS Wizard

42

AC1900, N900, and N450 WiFi

Cable Data Gateways

Manage the Internet Setup

In general, the cable data gateway receives the Internet settings dynamically from the cable

service provider. However, you can view or change the Internet settings.

The main Internet settings that you can configure are the IP address of the cable data

gateway (dynamic or static) and the Domain Name System (DNS) server (dynamic or static).



To view or change the Internet settings:

1.

On your computer, launch an Internet browser such as Mozilla Firefox or Microsoft

Internet Explorer.

2.

In the address field of your browser, enter

http://routerlogin.net

.

You are prompted to enter a user name and password.

3.

Type

admin

for the user name and type your password.

If you did not yet personalize your password, type

password

for the password.

4.

Click the

OK

button.

The BASIC Home screen displays.

5.

Select

ADVANCED > Setup > Internet Setup

.

The Internet Setup screen displays.

6.

View or change the settings for the IP address and DNS server.

The default settings usually work fine. If problems occur with the connection, check the

settings that your cable service provider gave you.

Manage Internet, WAN, and LAN Settings and Use the WPS Wizard

43

AC1900, N900, and N450 WiFi

Cable Data Gateways

The following table describes the fields on the Internet Setup screen.

Field

Description

Account Name (If Required)

Enter the account name provided by your cable service provider. This

name might also be called the host name. If you do not know or did not

receive an account name, leave the default name, which is the model

number of the cable data gateway.

Domain Name (If Required)

Enter the domain name provided by your cable service provider. If you do

not know the domain name, leave this field blank.

Internet IP Address

Get Dynamically from ISP

Your cable service provider uses DHCP to assign your IP address. Your

cable service provider automatically assigns these addresses.

Use Static IP Address

Enter the IP address, IP subnet mask, and gateway IP address that your

cable service provider assigned to you. The gateway is the provider

gateway to which your cable data gateway connects.

Domain Name Server (DNS) Address

The DNS server is used to look up site addresses based on their names.

Get Dynamically from ISP

Your cable service provider uses DHCP to assign your DNS servers. Your

cable service provider automatically assigns this address.

Use These DNS Servers

If you know that your cable service provider does not automatically transmit

DNS addresses to the cable data gateway during login, select this option,

and enter the IP address of your cable service provider primary DNS

server. If secondary and tertiary DNS server addresses are available, enter

these also.

7.

If you changed the settings, click the

Apply

button.

Your settings are saved.

Manage the WAN Settings

You can configure a DMZ (demilitarized zone) server, change the maximum transmit unit

(MTU) size, and enable the cable data gateway to respond to a ping on the WAN (Internet)

port.

View or Change the WAN Settings



To view or change the WAN settings:

1.

On your computer, launch an Internet browser such as Mozilla Firefox or Microsoft

Internet Explorer.

2.

In the address field of your browser, enter

http://routerlogin.net

.

You are prompted to enter a user name and password.

3.

Type

admin

for the user name and type your password.

Manage Internet, WAN, and LAN Settings and Use the WPS Wizard

44

AC1900, N900, and N450 WiFi

Cable Data Gateways

If you did not yet personalize your password, type

password

for the password.

4.

Click the

OK

button.

The BASIC Home screen displays.

5.

Select

ADVANCED > Setup > WAN Setup

.

The WAN Setup screen displays.

6.

View or change the WAN settings.

The following table describes the fields on the WAN Setup screen.

Field

Description

Disable Port Scan

Protection

If you want the cable data gateway to respond to a ping from the Internet, select

the

Disable Port Scan Protection

check box. However, use this feature only as

a diagnostic tool because your cable data gateway can be discovered and in that

way become vulnerable to attacks. Do not select this check box unless a specific

reason exists.

Disable 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. Select the

Disable DoS Protection

check box to disable protection only in special circumstances.

Default DMZ Server

Setting up a default DMZ server might be helpful when you are playing online

games or videoconferencing. However, a DMZ server can make the cable data

gateway security less effective.

For more information, see

Configure a Default DMZ Server

on page

45.

Manage Internet, WAN, and LAN Settings and Use the WPS Wizard

45

AC1900, N900, and N450 WiFi

Cable Data Gateways

7.

If you changed the settings, click the

Apply

button.

Your settings are saved and the cable data gateway might restart.

Configure a 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 cable data gateway can detect some of these applications and function 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 that is designated as

the default DMZ server loses firewall protection from exploits on

the Internet. Once compromised, the DMZ server computer attacks

other computers on your network.

The cable data gateway discards incoming traffic from the Internet that is not a response to

one of your local computers or a service that you specially set up for this purpose (see

Set

Up Port Forwarding to Local Computers

on page

121). Instead of discarding this traffic, you

can let the cable data gateway forward the traffic to one computer on your network. This

computer is called the default DMZ server.

Respond to Ping on

Internet Port

By default, this check box is selected to enable the cable data gateway to respond

to a ping from the Internet.

Note:

When you allow the cable data gateway to respond to a ping from the

Internet, the cable data gateway could be discovered by anyone and in that way

become vulnerable to attacks. For optimum security, clear this check box to

prevent the cable data gateway from responding to a ping from the Internet.

MTU Size (in bytes)

The default MTU setting is 0 (zero), which specifies that the cable data gateway

must use the maximum transmit unit (MTU) value for best throughput. However, if

you use a VPN connection, you might need to adjust the MTU to prevent packet

fragmentation and packet drops.

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.

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. Disabling the SIP ALG

might be useful when you are running certain applications. Select the

Disable SIP

ALG

check box to disable the SIP ALG.

Field

Description