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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
Page 42 / 168
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.
Page 43 / 168
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.
Page 44 / 168
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.
Page 45 / 168
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

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