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Page 66 / 134 Scroll up to view Page 61 - 65
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
4-10
Customizing Your Network Settings
v1.0, February 2008
•
The
Gateway IP Address
field specifies that all traffic for these addresses should be
forwarded to the ISDN router at 192.168.1.100.
•
A
Metric
value of 1 will work since the ISDN router is on the LAN.
•
Private
is selected only as a precautionary security measure in case RIP is activated.
Select
Static Routes
under Advanced in the main menu. The Static Routes screen displays.
To add or edit a static route:
1.
Click
Add
to open the Static Routes screen.
2.
In the
Route Name
field, type a name for this static route. (This is for identification purposes
only.)
3.
Select the
Private
check box if you want to limit access to the LAN only. If Private is selected,
the static route is not reported in RIP.
4.
Select the
Active
check box to make this route effective.
Figure 4-4
Figure 4-5
Page 67 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Customizing Your Network Settings
4-11
v1.0, February 2008
5.
Type the destination IP address of the final destination.
6.
Type the IP subnet mask for this destination.
If the destination is a single host, type 255.255.255.255.
7.
Type the gateway IP address, which must be a router on the same LAN segment as the
WNDR3300 router.
8.
Type a number between 1 and 15 as the metric value.
This represents the number of routers between your network and the destination. Usually, a
setting of 2 or 3 works, but if this is a direct connection, set it to 1.
9.
Click
Apply
to have the static route entered into the table.
Page 68 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
4-12
Customizing Your Network Settings
v1.0, February 2008
Page 69 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
Fine-Tuning Your Network
5-1
v1.0, February 2008
Chapter 5
Fine-Tuning Your Network
This chapter describes how to modify the configuration of the RangeMax Dual Band Wireless-N
Router WNDR3300 to allow specific applications to access the Internet or to be accessed from the
Internet, and how to make adjustments to enhance your network’s performance.
This chapter includes the following sections:
•
“Allowing Inbound Connections To Your Network
”
•
“Configuring Port Forwarding to Local Servers” on page 5-6
•
“Configuring Port Triggering” on page 5-9
•
“Using Universal Plug and Play” on page 5-12
•
“Optimizing Wireless Performance” on page 5-13
•
“Changing the MTU” on page 5-20
•
“Optimizing Your Network Bandwidth” on page 5-21
•
“Overview of Home and Small Office Networking Technologies” on page 5-23
Allowing Inbound Connections To Your Network
By default, the WNDR3300 router blocks any inbound traffic from the Internet to your computers
except for replies to your outbound traffic. However, you might need to create exceptions to this
rule for the following purposes:
•
To allow remote computers on the Internet to access a server on your local network.
•
To allow certain applications and games to work correctly when their replies are not
recognized by your router.
Your router provides two features for creating these exceptions: port forwarding and port
triggering. This section explains how a normal outbound connection works, followed by two
examples explaining how port forwarding and port triggering operate and how they differ.
Page 70 / 134
NETGEAR RangeMax™ Dual Band Wireless-N Router WNDR3300 Reference Manual
5-2
Fine-Tuning Your Network
v1.0, February 2008
How Your Computer Communicates with a Remote Computer
through Your Router
When a computer on your network needs to access a computer on the Internet, your computer
sends your router a message containing source and destination address and process information.
Before forwarding your message to the remote computer, your router must modify the source
information and must create and track the communication session so that replies can be routed
back to your computer.
Here is an example of normal outbound traffic and the resulting inbound responses:
1.
You open Internet Explorer, beginning a browser session on your computer. Invisible to you,
your operating system assigns a service number (port number) to every communication
process running on your computer. In this example, let’s say Windows assigns port number
5678 to this browser session.
2.
You ask your browser to get a Web page from the Web server at www.example.com. Your
computer composes a Web page request message with the following address and port
information:
•
The source address is your computer’s IP address.
•
The source port number is 5678, the browser session.
•
The destination address is the IP address of www.example.com, which your computer
finds by asking a DNS server.
•
The destination port number is 80, the standard port number for a Web server process.
Your computer then sends this request message to your router.
3.
Your router creates an entry in its internal session table describing this communication session
between your computer and the Web server at www.example.com. Before sending the Web
page request message to www.example.com, your router stores the original information and
then modifies the source information in the request message, performing Network Address
Translation (NAT):
•
The source address is replaced with your router’s public IP address.
This is necessary because your computer uses a private IP address that is not globally
unique and cannot be used on the Internet.
•
The source port number is changed to a number chosen by the router, such as 33333. This
is necessary because two computers could independently be using the same session
number.
Your router then sends this request message through the Internet to the Web server at
www.example.com.

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