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Chapter 7.
Advanced Settings (Part 1)
N300 Wireless Dual Band ADSL2+ Modem Router DGND3300v2 User Manual
4.
Click
Apply
to enter the reserved address into the table.
Note:
The reserved address is not assigned until the next time the
computer contacts the N300 wireless modem router’s DHCP server.
Reboot the computer or access its IP configuration and force a
DHCP release and renew.
To edit or delete a reserved address entry:
1.
Select the radio button next to the reserved address you want to edit or delete.
2.
Click
Edit
or
Delete
.
Using a Dynamic DNS Service
If your Internet Service Provider (ISP) gave you a permanently assigned IP address, you can
register a domain name and have that name linked with your IP address by public Domain
Name Servers (DNS). However, if your Internet account uses a dynamically assigned IP
address, you do not know in advance what your IP address will be, and the address can
change frequently. In this case, you can use a commercial Dynamic DNS service, which
allows you to register your domain to its IP address, and forwards traffic directed at your
domain to your frequently changing IP address.
Note:
If your ISP assigns a private WAN IP address (such as 192.168.x.x
or 10.x.x.x), the Dynamic DNS service will not work because private
addresses are not routed on the Internet.
Your N300 wireless modem router contains a client that can connect to the Dynamic DNS
service provided by DynDNS.org. You must first visit their website at
www.dyndns.org
and
obtain an account and host name, which you configure in the N300 wireless modem router.
Then, whenever your ISP-assigned IP address changes, your N300 wireless modem router
automatically contacts the Dynamic DNS service provider, logs in to your account, and
registers your new IP address. If your host name is hostname, for example, you can reach
your N300 wireless modem router at hostname.dyndns.org.
To configure Dynamic DNS:
1.
From the main menu, select
Advanced > Dynamic DNS
to display the Dynamic DNS
screen.
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Figure 56.
2.
Register for an account with one of the Dynamic DNS service providers whose names
appear in the Service Provider list. For example, for DynDNS.org, select
www.dyndns.org
.
3.
Select the
Use a Dynamic DNS Service
check box.
4.
Select the name of your Dynamic DNS service provider.
5.
Type the host name (or domain name) that your Dynamic DNS service provider gave you.
6.
Type the user name for your Dynamic DNS account. This is the name that you use to log in
to your account, not your host name.
7.
Type the password (or key) for your Dynamic DNS account.
8.
If your Dynamic DNS provider allows the use of wildcards in resolving your URL, you can
select the
Use Wildcards
check box to activate this feature. For example, the wildcard
feature causes *.yourhost.dyndns.org to be aliased to the same IP address as
yourhost.dyndns.org.
9.
Click
Apply
to save your configuration.
Configuring the WAN Setup Options
The WAN Setup screen lets you configure a DMZ (demilitarized zone) server, change the
Maximum Transmit Unit (MTU) size, and enable the N300 wireless modem router to respond
to a ping on the WAN (Internet) port. From the main menu, under Advanced, click
WAN
Setup
to view the WAN Setup screen.
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Figure 57.
The WAN Setup fields are described in the following table:
Setting
Description
Connect Automatically, as
Required
Usually, this check box is selected, so that an Internet connection is made
automatically whenever Internet-bound traffic is detected. If this causes high
connection costs, you can clear the check box to disable this feature.
If this setting is disabled, you must connect manually, using the screen that you
access by clicking the
Connection Status
button on the Status screen.
If you have an Always on connection, this setting has no effect.
Enable PPPoE Relay
Selecting this check box allows a PPPoE client on a local PC to connect to a
remote PPPoE server with the N300 wireless modem router acting as a relay
agent.
Disable Port Scan and DOS
Protection
The firewall protects your LAN against port scans and denial of service (DOS)
attacks. This protection should be disabled only in special circumstances.
Default DMZ Server
This feature is sometimes helpful when you are using some online games and
videoconferencing. Be careful when using this feature because it makes the
firewall security less effective. See
Configuring Static Routes
on page
123.
Respond to Ping on Internet
WAN Port
If you want the N300 wireless modem router to respond to a ping from the
Internet, select this check box. This should be used only as a diagnostic tool,
since it allows your N300 wireless modem router to be discovered. Do not select
this check box unless you have a specific reason to do so.
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, and should not be done unless
you are sure it is necessary for your ISP connection. See
Changing the MTU
Size
on page
134.
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. The
Disable
SIP ALG
check box allows you to disable the SIP ALG. Disabling the SIP ALG
might be useful when running certain applications.
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Setting Up a Default DMZ Server
The default DMZ server feature is helpful when using some online games and
videoconferencing applications that are incompatible with Network Address Translation
(NAT). The N300 wireless 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 usually discarded by the N300 wireless 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 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.
The WAN Setup screen lets you configure a default DMZ server.
To assign a computer or server to be a default DMZ server:
1.
In the last Default DMZ Server field, type the last digit of the IP address for that
computer. To remove the default DMZ server, enter
0
(zero).
2.
Select the
Default DMZ Server
check box, and click
Apply
.
Setting Up Quality of Service (QoS)
Quality of Service (QoS) is an advanced feature that can be used to prioritize some types of
traffic ahead of others. The N300 wireless modem router can provide QoS prioritization over
the wireless link and on the Internet connection.
The N300 wireless modem router supports Wi-Fi Multimedia Quality of Service (WMM QoS)
to prioritize wireless voice and video traffic over the wireless link. WMM QoS provides
prioritization of wireless data packets from different applications based on four access
categories: voice, video, best effort, and background. For an application to receive the
benefits of WMM QoS, both it and the client running that application must be WMM enabled.
Legacy applications that do not support WMM, and applications that do not require QoS, are
assigned to the best effort category, which receives a lower priority than voice and video.
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N300 Wireless Dual Band ADSL2+ Modem Router DGND3300v2 User Manual
Configuring QoS for Internet Access
To specify prioritization of traffic, you must add or create a policy for the type of traffic. To
display the QoS Setup screen, from the main menu, select
Advanced > QoS Setup
.
Figure 58.
WMM QoS is enabled by default. You can disable it by selecting
QoS Setup
from the main
menu, clearing the
Enable WMM (Wi-Fi multi-media Settings)
check box, and clicking
Apply
.
You can give prioritized Internet access to the following types of traffic:
•
For specific applications or online games, see
QoS for Applications and Online Gaming
on page
120.
•
For QoS on individual Ethernet LAN ports of the N300 wireless modem router, see
QoS
for a Router LAN Port
on page
122.
•
For QoS from a specific device by MAC address, see
QoS for a MAC Address
on
page
122.
QoS for Applications and Online Gaming
To create a QoS policy for traffic for specific applications or online games:
1.
From the main menu, select
Advanced > QoS Setup
. The QoS Setup screen displays.
2.
Click
Setup QoS rule
. The QoS Priority Rule List screen displays.
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