Netgear Dgnd4000 N750 Wireless Dual Band Gigabit Adsl2 Plus Modem Router User Manual

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9
9.   Advanced Settings
Fine-tuning your network
This chapter describes the advanced features of your wireless modem router. The information is 
for users with a solid understanding of networking concepts who want to set the wireless modem 
router up for unique situations such as when remote access from the Internet by IP or domain 
name is needed. 
This chapter includes the following sections:
•Advanced Wireless Settings 
•Wireless Repeating Function (WDS) 
•Port Forwarding and Triggering 
•Set Up Port Forwarding to Local Servers 
•Set Up Port Triggering 
•Dynamic DNS 
•Static Routes 
•Remote Management 
•USB Settings 
•Universal Plug and Play 
•IPv6 
•Traffic Meter 
•Device Mode 
•VPN Policies  
						

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N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000 
Advanced Wireless Settings
1. 
Select  ADVANCED > Advanced Setup > Wireless Settings:
The following settings are available in this screen:
2.  Enable W
 ireless Router Radio . You can completely turn off the wireless portion of the 
wireless modem router by clearing this check box. Select this check box \
again to enable the 
wireless portion of the wireless modem router. 
When the wireless radio is disabled, other members of your household can\
 use the 
wireless modem router by connecting their computers to the wireless mode\
m router with 
an Ethernet cable. 
Note: The Fragmentation Length, CTS/RTS Threshold, and Preamble Mode 
options are reserved for wireless testing and advanced configuration 
only. Do not change these settings.
3.  T
urn off wireless signal by schedule . From the Advanced Wireless Settings screen you 
can selected the check box for the radio band you want to configure usin\
g the Enable 
Wireless Router Radio. 
4.  Click the  Add a new period button to display the 
 Turn off wireless signal by schedule 
screen.  
						

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 N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
You can use this feature to turn off the wireless signal from your wireless modem router 
at times when you do not need a wireless connection. For example, you co\
uld turn it off 
for the weekend if you leave town.
5.  Click WPS Settings to add WPS devices to your network. 
6.  Click AP 
 Mode to make the DGND4000 function as an access point.
7.  From the 
 Advanced Wireless Settings screen, click the  Set Up Access List button to 
display the Wireless Card Access List screen. 
8.  Click  Add from the Wireless Card Access List screen to display the Wireless Card Access 
Setup screen.  
						

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N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000 
On this screen, you can restrict access to your network to specific devi\
ces based on their 
MAC address.  
						

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 N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
Wireless Repeating Function (WDS)
You can set the N750 Modem Router up to be used as a wireless access poin\
t (AP). Doing 
this setup enables the wireless modem router to act as a wireless repeat\
er. A wireless 
repeater connects to another wireless wireless modem router as a client \
where the network 
to which it connects becomes the ISP service.
Wireless repeating is a type of Wireless Distribution System (WDS). A WDS allows a wireless 
network to be expanded through multiple access points instead of using a\
 wired backbone to 
link them. 

The following figure shows a wireless repeating scenario.
Repeater
Base station
access point
access point
Figure 11. Wireless repeating scenario
Note: If you use the wireless repeating function, you need to select either 
WEP or None as a security option in the Wireless Settings screen. 
The WEP option displays only if you select the wireless mode  Up to 
54 Mbps in the Wireless Settings screen.
Wireless Base Station . 
 The wireless modem router acts as the parent access point, 
bridging traffic to and from the child repeater access point, as well as handling wir\
eless and 
wired local computers. To configure this mode, you have to know the MAC address of the 
child repeater access point. 
						

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N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000 
Wireless Repeater
. The wireless modem router sends all traffic from its local wireless or 
wired computers to a remote access point. To configure this mode, you have to know the 
MAC address of the remote parent access point. 
The DGND4000 wireless modem router is always in dual-band concurrent mod\
e, unless you  turn of
 f one radio. If you enable the wireless repeater in either radio band, t\
he wireless base 
station or wireless repeater cannot be enabled in the other radio band. \
However, if you 
enable the wireless base station in either radio band and use the other \
radio band as a 
wireless wireless modem router or wireless base station, dual-band concu\
rrent mode is not 
affected.
For you to set up a wireless network with WDS, 
the following conditions have to be met for 
both access points:
• Both access points have to use the same SSID, wireless channel, and encr\
yption mode.
• Both access points have to be on the same LAN IP subnet. 
 That is, all the access point 
LAN IP addresses are in the same network.
• All LAN devices (wired and wireless computers) have to be configured t\
o operate in the 
same LAN network address range as the access points.
Wireless Repeating Function 
1.  Select  ADVANCED > Advanced Setup > Wireless Repeating Function. 
2. To view or change wireless repeater settings for the wireless modem route\
r
a. Enable Wireless Repeating Function . Select the check box for the 2.4 GHz or 
5-GHz network to use the wireless repeating function.
b. Disable Wireless Client Association . If your wireless modem router is the 
repeater
 , selecting this check box means that wireless clients cannot associate \
with 
it. Only LAN client associations are allowed. 
						

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107  N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000
-If you are setting up a point-to-point bridge, select this check box. 
-If you want all client traffic to go through the other access point (repeater with wireless 
client association), leave this check box cleared.
3. Wireless MAC of this router. This field displays the MAC address for your wireless modem 
router for your reference. You need to enter this MAC address in the corresponding 
Wireless Repeating Function screen of the other access point you are using.
4. Wireless Repeater. Select this radio button, if your wireless modem router is the repeater.
a. Repeater IP Address. If your wireless modem router is the repeater, enter the IP 
address of the other access point.
b. Base Station MAC Address. If your wireless modem router is the repeater, enter 
the MAC address for the access point that is the base station.
5. Wireless Base Station. If your wireless modem router is the base station, select this radio 
button.
a. Disable Wireless Client Association. If your wireless modem router is the base 
station, selecting this check box means that wireless clients cannot associate with it. 
Only LAN client associations are allowed.
b. Repeater MAC Address (1 through 4). If your wireless modem router is the base 
station, it can act as the “parent” of up to four other access points. Enter the MAC 
addresses of the other access points in these fields.
Set Up the Base Station 
The wireless repeating function works only in hub and spoke mode. The units cannot be 
daisy-chained. You have to know the wireless settings for both units. You have to know the 
MAC address of the remote unit. First, set up the base station, and then set up the repeater.
To set up the base station:
1. Set up both units with the same wireless settings (SSID, mode, channel, and security). 
The wireless security option has to be set to None or WEP. 
						

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N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000 
2. 
Select  ADVANCED > Advanced Setup > Wireless Repeating Function.
3. Depending on the frequency you want to use, select the  Enable Wireless Repeating 
Function check box and select the  Wireless Base Station radio button.
4.  Enter the MAC address for one or more repeater units.
5.  Click  Apply  to save your changes.
Set Up a Repeater Unit
Use a wired Ethernet connection to set up the repeater unit to avoid con\
flicts with the 
wireless connection to the base station.
Note: If you are using the DGND4000 base station with a non-NETGEAR 
wireless modem router as the repeater, you might need to change 
additional configuration settings. In particular, you should disable the 
DHCP server function on the wireless repeater   AP.
To configure the wireless modem router as a repeater unit:
1. Log in to the wireless modem router that is the repeater
 . Select BASIC > Wireless 
Settings  and verify that the wireless settings match the base unit exactly. The wireless 
security option has to be set to WEP or None.
2.  Select  ADV
 ANCED > Advanced Setup > W ireless Repeating Function, and select the 
Enable Wireless Repeating Function check box  and the Wireless Repeater radio button.
3.  Fill in the Repeater IP 
 Address field. This IP address has to be in the same subnet as the 
base station, but different from the LAN IP of the base station.
4.  Click  Apply  to save your changes. 
						

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5. Verify connectivity across the LANs. 
A computer on any wireless or wired LAN segment of the wireless modem router can 
connect to the Internet or share files and printers with any other wireless or wired 
computer or server connected to the other access point.
Port Forwarding and Triggering
By default, the wireless modem router blocks inbound traffic from the Internet to your 
computers except replies to your outbound traffic. You might need to create exceptions to 
this rule for these 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 wireless modem router.
Your wireless modem router provides two features for creating these exceptions: port 
forwarding and port triggering. The next sections provide background information to help you 
understand how port forwarding and port triggering work, and the differences between the 
two.
Remote Computer Access Basics
When a computer on your network needs to access a computer on the Internet, your 
computer sends your wireless modem router a message containing the source and 
destination address and process information. Before forwarding your message to the remote 
computer, your wireless modem router has to modify the source information and 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 a browser, and your operating system assigns port number 5678 to this 
browser session. 
2. You type http://www.example.com into the URL field, and your computer creates a web 
page request message with the following address and port information. The request 
message is sent to your wireless modem router.
Source address. Your computer’s IP address.
Source port number. 5678, which is the browser session. 
Destination address. The IP address of www.example.com, which your computer finds 
by asking a DNS server.
Destination port number. 80, which is the standard port number for a web server 
process.
3. Your wireless modem 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 wireless  
						

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110 N750 Wireless Dual Band Gigabit ADSL Modem Router DGND4000 
modem 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 wireless modem router’s public IP address. 
This requirement 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 wireless modem 
router, such as 33333. This requirement is necessary because two computers could 
independently be using the same session number.
Your wireless modem router then sends this request message through the Internet to the 
web server at www.example.com.
4. The web server at www.example.com composes a return message with the requested web 
page data. The return message contains the following address and port information. The 
web server then sends this reply message to your wireless modem router.
Source address. The IP address of www.example.com.
Source port number. 80, which is the standard port number for a web server process.
Destination address. The public IP address of your wireless modem router.
Destination port number. 33333.
5. Upon receiving the incoming message, your wireless modem router checks its session 
table to determine whether there is an active session for port number 33333. Finding an 
active session, the wireless modem router then modifies the message to restore the original 
address information replaced by NAT. Your wireless modem router sends this reply 
message to your computer, which displays the web page from www.example.com. The 
message now contains the following address and port information.
Source address. The IP address of www.example.com.
Source port number. 80, which is the standard port number for a web server process.
Destination address. Your computer’s IP address.
Destination port number. 5678, which is the browser session that made the initial 
request.
6. When you finish your browser session, your wireless modem router eventually detects a 
period of inactivity in the communications. Your wireless modem router then removes the 
session information from its session table, and incoming traffic is no longer accepted on port 
number 33333.
Port Triggering to Open Incoming Ports
In the preceding example, requests are sent to a remote computer by your wireless modem 
router from a particular service port number, and replies from the remote computer to your 
wireless modem router are directed to that port number. If the remote server sends a reply to 
a different port number, your wireless modem router does not recognize it and discards it. 
However, some application servers (such as FTP and IRC servers) send replies to multiple 
port numbers. Using the port triggering function of your wireless modem router, you can tell