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Page 61 / 134 Scroll up to view Page 56 - 60
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Customizing Your Network Settings
4-5
v1.0, February 2008
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 their IP address, and forwards traffic directed at your domain to your frequently changing IP
address.
Your 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 router. Then, whenever your ISP-assigned IP address changes,
your 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
router at hostname.dyndns.org.
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.
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NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
4-6
Customizing Your Network Settings
v1.0, February 2008
From the main menu of the browser interface, under Advanced, select
Dynamic DNS
to display
the Dynamic DNS screen.
To configure Dynamic DNS:
1.
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
.
2.
Select the
Use a Dynamic DNS Service
check box.
3.
Select the name of your Dynamic DNS service provider.
4.
Type the host name (or domain name) that your Dynamic DNS service provider gave you.
5.
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.
6.
Type the password (or key) for your Dynamic DNS account.
7.
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.
8.
Click
Apply
to save your configuration.
Figure 4-2
Page 63 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Customizing Your Network Settings
4-7
v1.0, February 2008
Configuring the WAN Setup Options
The WAN Setup options let you configure a DMZ (demilitarized zone) server, change the
Maximum Transmit Unit (MTU) size, and enable the wireless router to respond to a ping on the
WAN (Internet) port. From the main menu of the browser interface, under Advanced, click
WAN
Setup
to view the WAN Setup screen.
Disabling the SPI Firewall
The Stateful Packet Inspection (SPI) firewall protects your network and computers against attacks
and intrusions. A stateful packet firewall carefully inspects incoming traffic packets, looking for
known exploits such as malformed, oversized, or out-of-sequence packets. The firewall should be
disabled only in special circumstances, such as when you are troubleshooting application issues.
Setting Up 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 router is programmed to recognize some of these applications and to work correctly with
Figure 4-3
Page 64 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
4-8
Customizing Your Network Settings
v1.0, February 2008
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.
Incoming traffic from the Internet is usually discarded by the 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.
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
.
Responding to a Ping on the Internet (WAN) Port
If you want the router to respond to a ping from the Internet, select the
Respond to Ping on
Internet Port
check box. This should be used only as a diagnostic tool, since it allows your router
to be discovered by Internet scanners. Do not select this check box unless you have a specific
reason to do so, such as when troubleshooting your connection.
Setting the MTU Size
The normal MTU value for most Ethernet networks is 1500 bytes, 1492 bytes for PPPoE
connections, or 1450 for PPTP connections. For some ISPs, you might need to reduce the MTU,
but this is rarely required and should not be done unless you are sure it is necessary for your ISP
connection. For more information, see
“Changing the MTU” on page 5-20
.
To change the MTU size:
1.
In the
MTU Size
field, enter a new size between 64 and 1500.
2.
Click
Apply
to save the new configuration.
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.
Page 65 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Customizing Your Network Settings
4-9
v1.0, February 2008
Configuring NAT Filtering
Network Address Translation (NAT) determines how the 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. For more information about NAT, see
“How Your Computer
Communicates with a Remote Computer through Your Router” on page 5-2
.
To change the NAT option:
1.
In the NAT Filtering area, select either the
Secured
or the
Open
radio button.
2.
Click
Apply
to save the new configuration.
Configuring Static Routes
Static routes provide additional routing information to your router. Under usual circumstances, the
router has adequate routing information after it has been configured for Internet access, and you do
not need to configure additional static routes. You must configure static routes only for unusual
cases such as multiple routers or multiple IP subnets located on your network.
As an example of when a static route is needed, consider the following case:
•
Your primary Internet access is through a cable modem to an ISP.
•
You have an ISDN router on your home network for connecting to the company where you are
employed. This router’s address on your LAN is
1
92.168.1.100.
•
Your company’s network address is 134.177.0.0.
When you first configured your router, two implicit static routes were created. A default route was
created with your ISP as the gateway, and a second static route was created to your local network
for all 192.168.1.x addresses. With this configuration, if you attempt to access a device on the
134.177.0.0 network, your router forwards your request to the ISP. The ISP forwards your request
to the company where you are employed, and the request is likely to be denied by the company’s
firewall.
In this case you must define a static route, telling your router that 134.177.0.0 should be accessed
through the ISDN router at 192.168.1.100.
In this example:
•
The
Destination IP Address
and
IP Subnet Mask
fields specify that this static route applies
to all 134.177.x.x addresses.

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